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                  <a href="#libvips-mosaicing.description" class="shortcut">Description</a>
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<a name="libvips-mosaicing"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="libvips-mosaicing.top_of_page"></a>mosaicing</span></h2>
<p>mosaicing — build image mosaics</p>
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<div class="refsect1">
<a name="libvips-mosaicing.stability-level"></a><h2>Stability Level</h2>
Stable, unless otherwise indicated
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<div class="refsynopsisdiv">
<a name="libvips-mosaicing.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;vips/vips.h&gt;

<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-lrmerge" title="im_lrmerge ()">im_lrmerge</a>                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dx</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dy</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-tbmerge" title="im_tbmerge ()">im_tbmerge</a>                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dx</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dy</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-lrmerge1" title="im_lrmerge1 ()">im_lrmerge1</a>                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-tbmerge1" title="im_tbmerge1 ()">im_tbmerge1</a>                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-lrmosaic" title="im_lrmosaic ()">im_lrmosaic</a>                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xref</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yref</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xsec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ysec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hwindowsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hsearchsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> balancetype</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-tbmosaic" title="im_tbmosaic ()">im_tbmosaic</a>                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xref</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yref</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xsec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ysec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hwindowsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hsearchsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> balancetype</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-lrmosaic1" title="im_lrmosaic1 ()">im_lrmosaic1</a>                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hwindowsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hsearchsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> balancetype</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-tbmosaic1" title="im_tbmosaic1 ()">im_tbmosaic1</a>                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hwindowsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hsearchsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> balancetype</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()">im_global_balance</a>                   (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> gamma</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-global-balancef" title="im_global_balancef ()">im_global_balancef</a>                  (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> gamma</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-correl" title="im_correl ()">im_correl</a>                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xref</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yref</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xsec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ysec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hwindowsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hsearchsize</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *correlation</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *x</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *y</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-remosaic" title="im_remosaic ()">im_remosaic</a>                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *old_str</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *new_str</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-align-bands" title="im_align_bands ()">im_align_bands</a>                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mosaicing.html#im-maxpos-subpel" title="im_maxpos_subpel ()">im_maxpos_subpel</a>                    (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *y</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libvips-mosaicing.description"></a><h2>Description</h2>
<p>
These functions are useful for joining many small images together to make
one large image. They can cope with unstable contrast and arbitary sub-image
layout, but will not do any geometric correction. Geometric errors should
be removed before using these functions.
</p>
<p>
The mosaicing functions can be grouped into layers:
</p>
<p>
The lowest level functions are <a class="link" href="libvips-mosaicing.html#im-correl" title="im_correl ()"><code class="function">im_correl()</code></a>, <a class="link" href="libvips-mosaicing.html#im-lrmerge" title="im_lrmerge ()"><code class="function">im_lrmerge()</code></a> and <a class="link" href="libvips-mosaicing.html#im-tbmerge" title="im_tbmerge ()"><code class="function">im_tbmerge()</code></a>.
<a class="link" href="libvips-mosaicing.html#im-correl" title="im_correl ()"><code class="function">im_correl()</code></a> 
searches a large image for a small sub-image, returning
the position of the best sub-image match. <a class="link" href="libvips-mosaicing.html#im-lrmerge" title="im_lrmerge ()"><code class="function">im_lrmerge()</code></a> and <a class="link" href="libvips-mosaicing.html#im-tbmerge" title="im_tbmerge ()"><code class="function">im_tbmerge()</code></a> 
join two images together
left-right or up-down with a smooth seam.
</p>
<p>
Next, <a class="link" href="libvips-mosaicing.html#im-lrmosaic" title="im_lrmosaic ()"><code class="function">im_lrmosaic()</code></a> and <a class="link" href="libvips-mosaicing.html#im-tbmosaic" title="im_tbmosaic ()"><code class="function">im_tbmosaic()</code></a> use the
search function plus the two low-level merge operations to join two images 
given just an approximate overlap as a start point. 
</p>
<p>
The functions <a class="link" href="libvips-mosaicing.html#im-lrmosaic1" title="im_lrmosaic1 ()"><code class="function">im_lrmosaic1()</code></a> and <a class="link" href="libvips-mosaicing.html#im-tbmosaic1" title="im_tbmosaic1 ()"><code class="function">im_tbmosaic1()</code></a> are
first-order
analogues of the basic mosaic functions: they take two approximate 
tie-points and use
them to rotate and scale the right-hand or bottom image before starting to
join.
</p>
<p>
Finally, <a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()"><code class="function">im_global_balance()</code></a> can be used to remove contrast differences in 
a mosaic
which has been assembled with these functions. It takes the mosaic apart,
measures image contrast differences along the seams, finds a set of
correction factors which will minimise these differences, and reassembles
the mosaic.
<a class="link" href="libvips-mosaicing.html#im-remosaic" title="im_remosaic ()"><code class="function">im_remosaic()</code></a> uses the
same
techniques, but will reassemble the image from a different set of source
images.
</p>
</div>
<div class="refsect1">
<a name="libvips-mosaicing.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="im-lrmerge"></a><h3>im_lrmerge ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_lrmerge                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dx</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dy</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);</pre>
<p>
This operation joins two images left-right (with <em class="parameter"><code>ref</code></em> on the left) with a 
smooth seam.
</p>
<p>
If the number of bands differs, one of the images 
must have one band. In this case, an n-band image is formed from the 
one-band image by joining n copies of the one-band image together, and then
the two n-band images are operated upon.
</p>
<p>
The two input images are cast up to the smallest common type (see table 
Smallest common format in 
arithmetic).
</p>
<p>
<em class="parameter"><code>dx</code></em> and <em class="parameter"><code>dy</code></em> give the displacement of <em class="parameter"><code>sec</code></em> relative to <em class="parameter"><code>ref</code></em>, in other words,
the vector to get from the origin of <em class="parameter"><code>sec</code></em> to the origin of <em class="parameter"><code>ref</code></em>, in other
words, <em class="parameter"><code>dx</code></em> will generally be a negative number. 
</p>
<p>
<em class="parameter"><code>mwidth</code></em> limits  the  maximum width of the
blend area.  A value of "-1" means "unlimited". The two images are blended 
with a raised cosine. 
</p>
<p>
Pixels with all bands equal to zero are "transparent", that
is, zero pixels in the overlap area do not  contribute  to  the  merge.
This makes it possible to join non-rectangular images.
</p>
<p>
See also: <a class="link" href="libvips-mosaicing.html#im-lrmosaic" title="im_lrmosaic ()"><code class="function">im_lrmosaic()</code></a>, <a class="link" href="libvips-mosaicing.html#im-tbmerge" title="im_tbmerge ()"><code class="function">im_tbmerge()</code></a>, <a class="link" href="libvips-resample.html#im-match-linear" title="im_match_linear ()"><code class="function">im_match_linear()</code></a>, <a class="link" href="libvips-conversion.html#im-insert" title="im_insert ()"><code class="function">im_insert()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ref</code></em> :</span></p></td>
<td>reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sec</code></em> :</span></p></td>
<td>secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dx</code></em> :</span></p></td>
<td>displacement of ref from sec</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dy</code></em> :</span></p></td>
<td>displacement of ref from sec</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mwidth</code></em> :</span></p></td>
<td>maximum seam width</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-tbmerge"></a><h3>im_tbmerge ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_tbmerge                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dx</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dy</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);</pre>
<p>
This operation joins two images top-bottom (with <em class="parameter"><code>ref</code></em> on the top) with a 
smooth seam.
</p>
<p>
If the number of bands differs, one of the images 
must have one band. In this case, an n-band image is formed from the 
one-band image by joining n copies of the one-band image together, and then
the two n-band images are operated upon.
</p>
<p>
The two input images are cast up to the smallest common type (see table 
Smallest common format in 
arithmetic).
</p>
<p>
<em class="parameter"><code>dx</code></em> and <em class="parameter"><code>dy</code></em> give the displacement of <em class="parameter"><code>sec</code></em> relative to <em class="parameter"><code>ref</code></em>, in other words,
the vector to get from the origin of <em class="parameter"><code>sec</code></em> to the origin of <em class="parameter"><code>ref</code></em>, in other
words, <em class="parameter"><code>dx</code></em> will generally be a negative number. 
</p>
<p>
<em class="parameter"><code>mwidth</code></em> limits  the  maximum height of the
blend area.  A value of "-1" means "unlimited". The two images are blended 
with a raised cosine. 
</p>
<p>
Pixels with all bands equal to zero are "transparent", that
is, zero pixels in the overlap area do not  contribute  to  the  merge.
This makes it possible to join non-rectangular images.
</p>
<p>
See also: <a class="link" href="libvips-mosaicing.html#im-lrmosaic" title="im_lrmosaic ()"><code class="function">im_lrmosaic()</code></a>, <a class="link" href="libvips-mosaicing.html#im-lrmerge" title="im_lrmerge ()"><code class="function">im_lrmerge()</code></a>, <a class="link" href="libvips-resample.html#im-match-linear" title="im_match_linear ()"><code class="function">im_match_linear()</code></a>, <a class="link" href="libvips-conversion.html#im-insert" title="im_insert ()"><code class="function">im_insert()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ref</code></em> :</span></p></td>
<td>reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sec</code></em> :</span></p></td>
<td>secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dx</code></em> :</span></p></td>
<td>displacement of ref from sec</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dy</code></em> :</span></p></td>
<td>displacement of ref from sec</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mwidth</code></em> :</span></p></td>
<td>maximum seam width</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-lrmerge1"></a><h3>im_lrmerge1 ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_lrmerge1                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);</pre>
<p>
This operation joins two images left-right (with <em class="parameter"><code>ref</code></em> on the left) 
given a pair of tie-points. <em class="parameter"><code>sec</code></em> is scaled and rotated as
necessary before the join.
</p>
<p>
<em class="parameter"><code>mwidth</code></em> limits  the  maximum width of the
blend area.  A value of "-1" means "unlimited". The two images are blended 
with a raised cosine. 
</p>
<p>
Pixels with all bands equal to zero are "transparent", that
is, zero pixels in the overlap area do not  contribute  to  the  merge.
This makes it possible to join non-rectangular images.
</p>
<p>
If the number of bands differs, one of the images 
must have one band. In this case, an n-band image is formed from the 
one-band image by joining n copies of the one-band image together, and then
the two n-band images are operated upon.
</p>
<p>
The two input images are cast up to the smallest common type (see table 
Smallest common format in 
arithmetic).
</p>
<p>
See also: <a class="link" href="libvips-mosaicing.html#im-tbmerge1" title="im_tbmerge1 ()"><code class="function">im_tbmerge1()</code></a>, <a class="link" href="libvips-mosaicing.html#im-lrmerge" title="im_lrmerge ()"><code class="function">im_lrmerge()</code></a>, <a class="link" href="libvips-conversion.html#im-insert" title="im_insert ()"><code class="function">im_insert()</code></a>, <a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()"><code class="function">im_global_balance()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ref</code></em> :</span></p></td>
<td>reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sec</code></em> :</span></p></td>
<td>secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xr1</code></em> :</span></p></td>
<td>first reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>yr1</code></em> :</span></p></td>
<td>first reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xs1</code></em> :</span></p></td>
<td>first secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ys1</code></em> :</span></p></td>
<td>first secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xr2</code></em> :</span></p></td>
<td>second reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>yr2</code></em> :</span></p></td>
<td>second reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xs2</code></em> :</span></p></td>
<td>second secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ys2</code></em> :</span></p></td>
<td>second secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mwidth</code></em> :</span></p></td>
<td>maximum blend width</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-tbmerge1"></a><h3>im_tbmerge1 ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_tbmerge1                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);</pre>
<p>
This operation joins two images top-bottom (with <em class="parameter"><code>ref</code></em> on the top) 
given a pair of tie-points. <em class="parameter"><code>sec</code></em> is scaled and rotated as
necessary before the join.
</p>
<p>
<em class="parameter"><code>mwidth</code></em> limits  the  maximum height of the
blend area.  A value of "-1" means "unlimited". The two images are blended 
with a raised cosine. 
</p>
<p>
Pixels with all bands equal to zero are "transparent", that
is, zero pixels in the overlap area do not  contribute  to  the  merge.
This makes it possible to join non-rectangular images.
</p>
<p>
If the number of bands differs, one of the images 
must have one band. In this case, an n-band image is formed from the 
one-band image by joining n copies of the one-band image together, and then
the two n-band images are operated upon.
</p>
<p>
The two input images are cast up to the smallest common type (see table 
Smallest common format in 
arithmetic).
</p>
<p>
See also: <a class="link" href="libvips-mosaicing.html#im-lrmerge1" title="im_lrmerge1 ()"><code class="function">im_lrmerge1()</code></a>, <a class="link" href="libvips-mosaicing.html#im-tbmerge" title="im_tbmerge ()"><code class="function">im_tbmerge()</code></a>, <a class="link" href="libvips-conversion.html#im-insert" title="im_insert ()"><code class="function">im_insert()</code></a>, <a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()"><code class="function">im_global_balance()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ref</code></em> :</span></p></td>
<td>reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sec</code></em> :</span></p></td>
<td>secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xr1</code></em> :</span></p></td>
<td>first reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>yr1</code></em> :</span></p></td>
<td>first reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xs1</code></em> :</span></p></td>
<td>first secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ys1</code></em> :</span></p></td>
<td>first secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xr2</code></em> :</span></p></td>
<td>second reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>yr2</code></em> :</span></p></td>
<td>second reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xs2</code></em> :</span></p></td>
<td>second secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ys2</code></em> :</span></p></td>
<td>second secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mwidth</code></em> :</span></p></td>
<td>maximum blend width</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-lrmosaic"></a><h3>im_lrmosaic ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_lrmosaic                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xref</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yref</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xsec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ysec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hwindowsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hsearchsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> balancetype</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);</pre>
<p>
This operation joins two images left-right (with <em class="parameter"><code>ref</code></em> on the left) 
given an approximate overlap.
</p>
<p>
<em class="parameter"><code>sec</code></em> is positioned so that the pixel (<em class="parameter"><code>xsec</code></em>, <em class="parameter"><code>ysec</code></em>) lies on top of the
pixel in <em class="parameter"><code>ref</code></em> at (<em class="parameter"><code>xref</code></em>, <em class="parameter"><code>yref</code></em>). The overlap area is divided into three
sections, 20 high-contrast points in band <em class="parameter"><code>bandno</code></em> of image <em class="parameter"><code>ref</code></em> are found 
in each, and each high-contrast point is searched for in <em class="parameter"><code>sec</code></em> using
<em class="parameter"><code>hwindowsize</code></em> and <em class="parameter"><code>hsearchsize</code></em> (see <a class="link" href="libvips-mosaicing.html#im-correl" title="im_correl ()"><code class="function">im_correl()</code></a>). 
</p>
<p>
A linear model is fitted to the 60 tie-points, points a long way from the
fit are discarded, and the model refitted until either too few points
remain or the model reaches good agreement. 
</p>
<p>
The detected displacement is used with <a class="link" href="libvips-mosaicing.html#im-lrmerge" title="im_lrmerge ()"><code class="function">im_lrmerge()</code></a> to join the two images
together. 
</p>
<p>
<em class="parameter"><code>mwidth</code></em> limits  the  maximum width of the
blend area.  A value of "-1" means "unlimited". The two images are blended 
with a raised cosine. 
</p>
<p>
Pixels with all bands equal to zero are "transparent", that
is, zero pixels in the overlap area do not  contribute  to  the  merge.
This makes it possible to join non-rectangular images.
</p>
<p>
If the number of bands differs, one of the images 
must have one band. In this case, an n-band image is formed from the 
one-band image by joining n copies of the one-band image together, and then
the two n-band images are operated upon.
</p>
<p>
The two input images are cast up to the smallest common type (see table 
Smallest common format in 
arithmetic).
</p>
<p>
See also: <a class="link" href="libvips-mosaicing.html#im-lrmerge" title="im_lrmerge ()"><code class="function">im_lrmerge()</code></a>, <a class="link" href="libvips-mosaicing.html#im-tbmosaic" title="im_tbmosaic ()"><code class="function">im_tbmosaic()</code></a>, <a class="link" href="libvips-conversion.html#im-insert" title="im_insert ()"><code class="function">im_insert()</code></a>, <a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()"><code class="function">im_global_balance()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ref</code></em> :</span></p></td>
<td>reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sec</code></em> :</span></p></td>
<td>secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bandno</code></em> :</span></p></td>
<td>band to search for features</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xref</code></em> :</span></p></td>
<td>position in reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>yref</code></em> :</span></p></td>
<td>position in reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xsec</code></em> :</span></p></td>
<td>position in secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysec</code></em> :</span></p></td>
<td>position in secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hwindowsize</code></em> :</span></p></td>
<td>half window size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hsearchsize</code></em> :</span></p></td>
<td>half search size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>balancetype</code></em> :</span></p></td>
<td>no longer used</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mwidth</code></em> :</span></p></td>
<td>maximum blend width</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-tbmosaic"></a><h3>im_tbmosaic ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_tbmosaic                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xref</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yref</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xsec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ysec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hwindowsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hsearchsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> balancetype</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);</pre>
<p>
This operation joins two images top-bottom (with <em class="parameter"><code>ref</code></em> on the top) 
given an approximate overlap.
</p>
<p>
<em class="parameter"><code>sec</code></em> is positioned so that the pixel (<em class="parameter"><code>xsec</code></em>, <em class="parameter"><code>ysec</code></em>) lies on top of the
pixel in <em class="parameter"><code>ref</code></em> at (<em class="parameter"><code>xref</code></em>, <em class="parameter"><code>yref</code></em>). The overlap area is divided into three
sections, 20 high-contrast points in band <em class="parameter"><code>bandno</code></em> of image <em class="parameter"><code>ref</code></em> are found 
in each, and each high-contrast point is searched for in <em class="parameter"><code>sec</code></em> using
<em class="parameter"><code>hwindowsize</code></em> and <em class="parameter"><code>hsearchsize</code></em> (see <a class="link" href="libvips-mosaicing.html#im-correl" title="im_correl ()"><code class="function">im_correl()</code></a>). 
</p>
<p>
A linear model is fitted to the 60 tie-points, points a long way from the
fit are discarded, and the model refitted until either too few points
remain or the model reaches good agreement. 
</p>
<p>
The detected displacement is used with <a class="link" href="libvips-mosaicing.html#im-tbmerge" title="im_tbmerge ()"><code class="function">im_tbmerge()</code></a> to join the two images
together. 
</p>
<p>
<em class="parameter"><code>mwidth</code></em> limits  the  maximum height of the
blend area.  A value of "-1" means "unlimited". The two images are blended 
with a raised cosine. 
</p>
<p>
Pixels with all bands equal to zero are "transparent", that
is, zero pixels in the overlap area do not  contribute  to  the  merge.
This makes it possible to join non-rectangular images.
</p>
<p>
If the number of bands differs, one of the images 
must have one band. In this case, an n-band image is formed from the 
one-band image by joining n copies of the one-band image together, and then
the two n-band images are operated upon.
</p>
<p>
The two input images are cast up to the smallest common type (see table 
Smallest common format in 
arithmetic).
</p>
<p>
See also: <a class="link" href="libvips-mosaicing.html#im-tbmerge" title="im_tbmerge ()"><code class="function">im_tbmerge()</code></a>, <a class="link" href="libvips-mosaicing.html#im-lrmosaic" title="im_lrmosaic ()"><code class="function">im_lrmosaic()</code></a>, <a class="link" href="libvips-conversion.html#im-insert" title="im_insert ()"><code class="function">im_insert()</code></a>, <a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()"><code class="function">im_global_balance()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ref</code></em> :</span></p></td>
<td>reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sec</code></em> :</span></p></td>
<td>secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bandno</code></em> :</span></p></td>
<td>band to search for features</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xref</code></em> :</span></p></td>
<td>position in reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>yref</code></em> :</span></p></td>
<td>position in reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xsec</code></em> :</span></p></td>
<td>position in secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysec</code></em> :</span></p></td>
<td>position in secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hwindowsize</code></em> :</span></p></td>
<td>half window size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hsearchsize</code></em> :</span></p></td>
<td>half search size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>balancetype</code></em> :</span></p></td>
<td>no longer used</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mwidth</code></em> :</span></p></td>
<td>maximum blend width</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-lrmosaic1"></a><h3>im_lrmosaic1 ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_lrmosaic1                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hwindowsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hsearchsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> balancetype</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);</pre>
<p>
This operation joins two images left-right (with <em class="parameter"><code>ref</code></em> on the left) 
given an approximate pair of tie-points. <em class="parameter"><code>sec</code></em> is scaled and rotated as
necessary before the join.
</p>
<p>
Before performing the transformation, the  tie-points are improved by 
searching band <em class="parameter"><code>bandno</code></em> in an area of <em class="parameter"><code>sec</code></em> of size <em class="parameter"><code>hsearchsize</code></em> for a
match of size <em class="parameter"><code>hwindowsize</code></em> to <em class="parameter"><code>ref</code></em>. 
</p>
<p>
<em class="parameter"><code>mwidth</code></em> limits  the  maximum width of the
blend area.  A value of "-1" means "unlimited". The two images are blended 
with a raised cosine. 
</p>
<p>
Pixels with all bands equal to zero are "transparent", that
is, zero pixels in the overlap area do not  contribute  to  the  merge.
This makes it possible to join non-rectangular images.
</p>
<p>
If the number of bands differs, one of the images 
must have one band. In this case, an n-band image is formed from the 
one-band image by joining n copies of the one-band image together, and then
the two n-band images are operated upon.
</p>
<p>
The two input images are cast up to the smallest common type (see table 
Smallest common format in 
arithmetic).
</p>
<p>
See also: <a class="link" href="libvips-mosaicing.html#im-tbmosaic1" title="im_tbmosaic1 ()"><code class="function">im_tbmosaic1()</code></a>, <a class="link" href="libvips-mosaicing.html#im-lrmerge" title="im_lrmerge ()"><code class="function">im_lrmerge()</code></a>, <a class="link" href="libvips-conversion.html#im-insert" title="im_insert ()"><code class="function">im_insert()</code></a>, <a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()"><code class="function">im_global_balance()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ref</code></em> :</span></p></td>
<td>reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sec</code></em> :</span></p></td>
<td>secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bandno</code></em> :</span></p></td>
<td>band to search for features</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xr1</code></em> :</span></p></td>
<td>first reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>yr1</code></em> :</span></p></td>
<td>first reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xs1</code></em> :</span></p></td>
<td>first secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ys1</code></em> :</span></p></td>
<td>first secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xr2</code></em> :</span></p></td>
<td>second reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>yr2</code></em> :</span></p></td>
<td>second reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xs2</code></em> :</span></p></td>
<td>second secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ys2</code></em> :</span></p></td>
<td>second secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hwindowsize</code></em> :</span></p></td>
<td>half window size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hsearchsize</code></em> :</span></p></td>
<td>half search size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>balancetype</code></em> :</span></p></td>
<td>no longer used</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mwidth</code></em> :</span></p></td>
<td>maximum blend width</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-tbmosaic1"></a><h3>im_tbmosaic1 ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_tbmosaic1                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys1</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yr2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xs2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ys2</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hwindowsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hsearchsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> balancetype</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> mwidth</code></em>);</pre>
<p>
This operation joins two images top-bottom (with <em class="parameter"><code>ref</code></em> on the top) 
given an approximate pair of tie-points. <em class="parameter"><code>sec</code></em> is scaled and rotated as
necessary before the join.
</p>
<p>
Before performing the transformation, the  tie-points are improved by 
searching band <em class="parameter"><code>bandno</code></em> in an area of <em class="parameter"><code>sec</code></em> of size <em class="parameter"><code>hsearchsize</code></em> for a
match of size <em class="parameter"><code>hwindowsize</code></em> to <em class="parameter"><code>ref</code></em>. 
</p>
<p>
<em class="parameter"><code>mwidth</code></em> limits  the  maximum height of the
blend area.  A value of "-1" means "unlimited". The two images are blended 
with a raised cosine. 
</p>
<p>
Pixels with all bands equal to zero are "transparent", that
is, zero pixels in the overlap area do not  contribute  to  the  merge.
This makes it possible to join non-rectangular images.
</p>
<p>
If the number of bands differs, one of the images 
must have one band. In this case, an n-band image is formed from the 
one-band image by joining n copies of the one-band image together, and then
the two n-band images are operated upon.
</p>
<p>
The two input images are cast up to the smallest common type (see table 
Smallest common format in 
arithmetic).
</p>
<p>
See also: <a class="link" href="libvips-mosaicing.html#im-lrmosaic1" title="im_lrmosaic1 ()"><code class="function">im_lrmosaic1()</code></a>, <a class="link" href="libvips-mosaicing.html#im-tbmerge" title="im_tbmerge ()"><code class="function">im_tbmerge()</code></a>, <a class="link" href="libvips-conversion.html#im-insert" title="im_insert ()"><code class="function">im_insert()</code></a>, <a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()"><code class="function">im_global_balance()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ref</code></em> :</span></p></td>
<td>reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sec</code></em> :</span></p></td>
<td>secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bandno</code></em> :</span></p></td>
<td>band to search for features</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xr1</code></em> :</span></p></td>
<td>first reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>yr1</code></em> :</span></p></td>
<td>first reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xs1</code></em> :</span></p></td>
<td>first secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ys1</code></em> :</span></p></td>
<td>first secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xr2</code></em> :</span></p></td>
<td>second reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>yr2</code></em> :</span></p></td>
<td>second reference tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xs2</code></em> :</span></p></td>
<td>second secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ys2</code></em> :</span></p></td>
<td>second secondary tie-point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hwindowsize</code></em> :</span></p></td>
<td>half window size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hsearchsize</code></em> :</span></p></td>
<td>half search size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>balancetype</code></em> :</span></p></td>
<td>no longer used</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mwidth</code></em> :</span></p></td>
<td>maximum blend width</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-global-balance"></a><h3>im_global_balance ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_global_balance                   (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> gamma</code></em>);</pre>
<p>
<a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()"><code class="function">im_global_balance()</code></a> can be used to remove contrast differences in 
an assembled mosaic.
</p>
<p>
It reads the History field attached to <em class="parameter"><code>in</code></em> and builds a list of the source
images that were used to make the mosaic and the position that each ended
up at in the final image.
</p>
<p>
It opens each of the source images in turn and extracts all parts which
overlap with any of the other images. It finds the average values in the
overlap areas and uses least-mean-square to find a set of correction
factors which will minimise overlap differences. It uses <em class="parameter"><code>gamma</code></em> to
gamma-correct the source images before calculating the factors. A value of
1.0 will stop this.
</p>
<p>
Each of the source images is transformed with the appropriate correction 
factor, then the mosaic is reassembled. <em class="parameter"><code>out</code></em> always has the same <span class="type">BandFmt</span>
as <em class="parameter"><code>in</code></em>. Use <a class="link" href="libvips-mosaicing.html#im-global-balancef" title="im_global_balancef ()"><code class="function">im_global_balancef()</code></a> to get float output and avoid clipping.
</p>
<p>
There are some conditions that must be met before this operation can work:
the source images must all be present under the filenames recorded in the
history on <em class="parameter"><code>in</code></em>, and the mosaic must have been built using only operations in
this package.
</p>
<p>
See also: <a class="link" href="libvips-mosaicing.html#im-global-balancef" title="im_global_balancef ()"><code class="function">im_global_balancef()</code></a>, <a class="link" href="libvips-mosaicing.html#im-remosaic" title="im_remosaic ()"><code class="function">im_remosaic()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mosaic to rebuild</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gamma</code></em> :</span></p></td>
<td>gamma of source images</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-global-balancef"></a><h3>im_global_balancef ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_global_balancef                  (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> gamma</code></em>);</pre>
<p>
Just as <a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()"><code class="function">im_global_balance()</code></a>, but the output image is always float. This
stops overflow or underflow in the case of an extremely unbalanced image
mosaic. 
</p>
<p>
See also: <a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()"><code class="function">im_global_balance()</code></a>, <a class="link" href="libvips-mosaicing.html#im-remosaic" title="im_remosaic ()"><code class="function">im_remosaic()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mosaic to rebuild</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gamma</code></em> :</span></p></td>
<td>gamma of source images</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-correl"></a><h3>im_correl ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_correl                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *sec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xref</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> yref</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xsec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ysec</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hwindowsize</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> hsearchsize</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *correlation</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *x</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *y</code></em>);</pre>
<p>
This operation finds the position of <em class="parameter"><code>sec</code></em> within <em class="parameter"><code>ref</code></em>. 
</p>
<p>
The area around
(<em class="parameter"><code>xsec</code></em>, <em class="parameter"><code>ysec</code></em>) is searched for the best match to the area around (<em class="parameter"><code>xref</code></em>,
<em class="parameter"><code>yref</code></em>). It  searches an area of size <em class="parameter"><code>hsearchsize</code></em> for a
match of size <em class="parameter"><code>hwindowsize</code></em>.  The position of the best match is
returned, together with the correlation at that point.
</p>
<p>
Only  the  first  band  of each image is correlated. <em class="parameter"><code>ref</code></em> and <em class="parameter"><code>sec</code></em> may be
very large --- the function  extracts  and  generates  just  the
parts needed.  Correlation is done with <a class="link" href="libvips-convolution.html#im-spcor" title="im_spcor ()"><code class="function">im_spcor()</code></a>; the position of
the maximum is found with <a class="link" href="libvips-arithmetic.html#im-maxpos" title="im_maxpos ()"><code class="function">im_maxpos()</code></a>.
</p>
<p>
See also: <a class="link" href="libvips-resample.html#im-match-linear" title="im_match_linear ()"><code class="function">im_match_linear()</code></a>, <a class="link" href="libvips-resample.html#im-match-linear-search" title="im_match_linear_search ()"><code class="function">im_match_linear_search()</code></a>, <a class="link" href="libvips-mosaicing.html#im-lrmosaic" title="im_lrmosaic ()"><code class="function">im_lrmosaic()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ref</code></em> :</span></p></td>
<td>reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sec</code></em> :</span></p></td>
<td>secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xref</code></em> :</span></p></td>
<td>position in reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>yref</code></em> :</span></p></td>
<td>position in reference image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xsec</code></em> :</span></p></td>
<td>position in secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysec</code></em> :</span></p></td>
<td>position in secondary image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hwindowsize</code></em> :</span></p></td>
<td>half window size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hsearchsize</code></em> :</span></p></td>
<td>half search size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>correlation</code></em> :</span></p></td>
<td>return detected correlation</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>return found position</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>return found position</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-remosaic"></a><h3>im_remosaic ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_remosaic                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *old_str</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *new_str</code></em>);</pre>
<p>
<a class="link" href="libvips-mosaicing.html#im-remosaic" title="im_remosaic ()"><code class="function">im_remosaic()</code></a> works rather as <a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()"><code class="function">im_global_balance()</code></a>. It takes apart the
mosaiced image in and rebuilds it, substituting images.
</p>
<p>
Unlike <a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()"><code class="function">im_global_balance()</code></a>, images are substituted based on their file‐
names.  The  rightmost  occurence  of the string <em class="parameter"><code>old_str</code></em> is swapped
for <em class="parameter"><code>new_str</code></em>, that file is opened, and that image substituted  for
the  old image.
</p>
<p>
It's convenient for multispectral images. You can mosaic one band, then
use that mosaic as a template for mosaicing the others automatically.
</p>
<p>
See also: <a class="link" href="libvips-mosaicing.html#im-lrmosaic" title="im_lrmosaic ()"><code class="function">im_lrmosaic()</code></a>, <a class="link" href="libvips-mosaicing.html#im-global-balance" title="im_global_balance ()"><code class="function">im_global_balance()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mosaic to rebuild</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>old_str</code></em> :</span></p></td>
<td>gamma of source images</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>new_str</code></em> :</span></p></td>
<td>gamma of source images</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-align-bands"></a><h3>im_align_bands ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_align_bands                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);</pre>
<p>
This operation uses <a class="link" href="libvips-freq-filt.html#im-phasecor-fft" title="im_phasecor_fft ()"><code class="function">im_phasecor_fft()</code></a> to find an integer displacement to
align all image bands band 0. It is very slow and not very accurate. 
</p>
<p>
Use <code class="function">im_estpar()</code> in preference: it's fast and accurate.
</p>
<p>
See also: <a class="link" href="libvips-mosaicing.html#im-global-balancef" title="im_global_balancef ()"><code class="function">im_global_balancef()</code></a>, <a class="link" href="libvips-mosaicing.html#im-remosaic" title="im_remosaic ()"><code class="function">im_remosaic()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>image to align</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-maxpos-subpel"></a><h3>im_maxpos_subpel ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_maxpos_subpel                    (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *y</code></em>);</pre>
<p>
This function implements:
</p>
<p>
  "Extension of Phase Correlation to Subpixel Registration"
  by H. Foroosh, from IEEE trans. Im. Proc. 11(3), 2002.
</p>
<p>
If the best three matches in the correlation are aranged:
</p>
<p>
  02   or   01
  1         2
</p>
<p>
then we return a subpixel match using the ratio of correlations in the
vertical and horizontal dimension.
</p>
<p>
( xs[0], ys[0] ) is the best integer alignment
( xs[ use_x ], ys[ use_x ] ) is equal in y and (+/-)1 off in x
( xs[ use_y ], ys[ use_y ] ) is equal in x and (+/-)1 off in y
</p>
<p>
Alternatively if the best four matches in the correlation are aranged in
a square:
</p>
<p>
  01  or  03  or  02  or  03
  32      12      31      21
</p>
<p>
then we return a subpixel match weighting with the sum the two on each
side over the sum of all four, but only if all four of them are very
close to the best, and the fifth is nowhere near.
</p>
<p>
This alternative method is not described by Foroosh, but is often the
case where the match is close to n-and-a-half pixels in both dimensions.
</p>
<p>
See also: <a class="link" href="libvips-arithmetic.html#im-maxpos" title="im_maxpos ()"><code class="function">im_maxpos()</code></a>, <a class="link" href="libvips-arithmetic.html#im-min" title="im_min ()"><code class="function">im_min()</code></a>, <a class="link" href="libvips-arithmetic.html#im-stats" title="im_stats ()"><code class="function">im_stats()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>output position of maximum</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>output position of maximum</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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