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<h3 class="sectionHead"><span class="titlemark">2.2 </span> <a
id="x8-70002.2"></a><span
class="pcrr7t-">nip2 </span>for reflectogram mosaics</h3>
<!--l. 212--><p class="noindent" ><a name="nip_label_sec:irtut"></a>
<!--l. 214--><p class="indent" > This section quickly builds an infrared reflectogram
mosaic using the sample images that come with <span
class="pcrr7t-">nip2</span>. See
Chapter <a
href="nipguidech3.html#x10-90003">3<!--tex4ht:ref: sec:ir --></a> for detailed coverage.
<!--l. 218--><p class="indent" > Click on <span
class="pcrr7t-">File </span>/ <span
class="pcrr7t-">Open Examples</span>. You should see a
directory called <span
class="pcrr7t-">1</span><span
class="pcrr7t-">_point</span><span
class="pcrr7t-">_mosaic</span>. Doubleclick and
you’ll see a file called <span
class="pcrr7t-">1pt</span><span
class="pcrr7t-">_mosaic.ws</span>. Doubleclick that
and you’ll load the workspace for this example.
<!--l. 223--><p class="indent" > If you’d rather make the workspace yourself, click on the
file type filter and select <span
class="pcrr7t-">All files</span>. A set of 8 images
should appear. Click on the first file, shift-click on the last,
and click <span
class="pcrr7t-">Open</span>. See Figure <a
href="#x8-70018">2.8<!--tex4ht:ref: fg:loadsamples --></a>.
<!--l. 227--><p class="indent" > <hr class="figure"><div class="figure"
>
<a
id="x8-70018"></a>
<div class="center"
>
<!--l. 228--><p class="noindent" >
<!--l. 228--><p class="noindent" ><img
src="figs/snap14.jpg" alt="PIC"
></div>
<br /> <div class="caption"
><span class="id">Figure 2.8: </span><span
class="content">Loading the sample images</span></div><!--tex4ht:label?: x8-70018 -->
<!--l. 230--><p class="noindent" ><a name="nip_label_fg:loadsamples"></a>
<!--l. 231--><p class="indent" > </div><hr class="endfigure">
<!--l. 233--><p class="indent" > The images have been named to match their positions in
the mosaic, so for example <span
class="pcrr7t-">cd2.1.jpg </span>is the first image
in row two. Open up viewing windows for the first two
images by double clicking on the thumbnails. Move the two
opened images viewers so that they are side by side. Adjust
the zoom (using the <span
class="pcrr7t-">i </span>and <span
class="pcrr7t-">o </span>keys) and the pan (by dragging
with the middle mouse button) so that the overlap area is
visible in both images.
<!--l. 241--><p class="indent" > Mark a tie-point on each image by Ctrl-left-clicking on a
feature you can see in both images, see Figure <a
href="#x8-70029">2.9<!--tex4ht:ref: fg:readyjoin --></a>. Move a
point after you’ve marked it by dragging on the label.
You don’t need to be exact: <span
class="pcrr7t-">nip2 </span>just uses the point
you select as the start point for a search. It can cope
with misses of up to about 10 pixels. To mosaic the
two images together, click on <span
class="pcrr7t-">Toolkits </span>/ <span
class="pcrr7t-">Tasks </span>/
<span
class="pcrr7t-">Mosaic </span>/ <span
class="pcrr7t-">One Point </span>/ <span
class="pcrr7t-">Left to Right</span>. See
Figure <a
href="#x8-700310">2.10<!--tex4ht:ref: fg:joined --></a>.
<!--l. 249--><p class="indent" > <hr class="figure"><div class="figure"
>
<a
id="x8-70029"></a>
<div class="center"
>
<!--l. 250--><p class="noindent" >
<!--l. 250--><p class="noindent" ><img
src="figs/snap15.jpg" alt="PIC"
></div>
<br /> <div class="caption"
><span class="id">Figure 2.9: </span><span
class="content">Ready to join</span></div><!--tex4ht:label?: x8-70029 -->
<!--l. 252--><p class="noindent" ><a name="nip_label_fg:readyjoin"></a>
<!--l. 253--><p class="indent" > </div><hr class="endfigure">
<!--l. 255--><p class="indent" > <hr class="figure"><div class="figure"
>
<a
id="x8-700310"></a>
<div class="center"
>
<!--l. 256--><p class="noindent" >
<!--l. 256--><p class="noindent" ><img
src="figs/snap16.jpg" alt="PIC"
></div>
<br /> <div class="caption"
><span class="id">Figure 2.10: </span><span
class="content">Joined images</span></div><!--tex4ht:label?: x8-700310 -->
<!--l. 258--><p class="noindent" ><a name="nip_label_fg:joined"></a>
<!--l. 259--><p class="indent" > </div><hr class="endfigure">
<!--l. 261--><p class="indent" > Picking items deep in the toolkit menu is fiddly, so <span
class="pcrr7t-">nip2</span>
has several shortcuts. First, you can tear off any toolkit
menu by clicking on the dotted line at the top. Secondly,
you can assign any keyboard accelerator to any menu item.
Navigate to the menu item and while it is selected, press the
key combination you want to use as a shortcut (for example,
Ctrl-L might be good for <span
class="pcrr7t-">Mosaic </span>/ <span
class="pcrr7t-">One Point </span>/ <span
class="pcrr7t-">Left</span>
<span
class="pcrr7t-">to Right</span>). Now whenever you press Ctrl-L with the
keyboard focus in the main window, you will do a left-right
mosaic join. Finally, you can use the toolkit browser to
display a selection of the tools in a pane on the right-hand
side of the main window. Click on <span
class="pcrr7t-">View </span>/ <span
class="pcrr7t-">Browse</span>
<span
class="pcrr7t-">Toolkits</span>, then type “mosaic” into the search box at the
top. The toolkit browser will display all items related to
mosaicing.
<!--l. 274--><p class="indent" > Some systems won’t let you edit menu shortcuts by
default. For example, on GNOME, you need to enable this
in <span
class="pcrr7t-">System </span>/ <span
class="pcrr7t-">Preferences </span>/ <span
class="pcrr7t-">Menus & Toolbars</span>.
<!--l. 278--><p class="indent" > Join the rest of the pairs of sample images together
left-right. Figure <span
class="ptmb7t-">??</span> shows how they should fit together.
Once you have made all the rows, join the rows together in
turn to make the complete image using <span
class="pcrr7t-">Mosaic </span>/ <span
class="pcrr7t-">One</span>
<span
class="pcrr7t-">Point </span>/ <span
class="pcrr7t-">Top to Bottom</span>.
<!--l. 283--><p class="indent" > When you’ve built the whole thing you’ll see that there
are differences in brightness between the tiles that make up
your composite image. You can fix most problems like this
automatically by selecting your final mosaiced image and
clicking on <span
class="pcrr7t-">Mosaic </span>/ <span
class="pcrr7t-">Balance</span>. This operation takes your
mosaic apart, examines the overlap areas for differences
in brightness, calculates a set of adjustment factors
to minimise these differences, and then rebuilds the
mosaic.
<!--l. 291--><p class="indent" > There can be some problems left even after mosaic
balance. Use <span
class="pcrr7t-">Mosaic </span>/ <span
class="pcrr7t-">Tilt Brightness </span>to remove
any left-right or up-down graduations in brightness.
<!--l. 295--><p class="indent" > Save your mosaic workspace for future reference by
clicking on <span
class="pcrr7t-">File </span>/ <span
class="pcrr7t-">Save Workspace</span>. To save just the
mosaiced image, right click on the thumbnail and select
<span
class="pcrr7t-">Save As</span>.
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