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<head>
<title>idwt2</title>
</head>
<body bgcolor="#FFFFFF">
<center>Scilab Wavelet Toolbox Function </center>
<div align="right">Last update : June 2007 </div>
<p>
<b>idwt2</b> - Two Dimension Inverse Discrete Fast Wavelet Transform </p>
<h3>
<font color="blue">Calling Sequence</font>
</h3>
<dl>
<dd>
<tt>X=idwt2(CA,CH,CV,CD,wname,[S])</tt>
</dd>
<dd>
<tt>X=idwt2(CA,CH,CV,CD,Lo_R,Hi_R,[S])</tt>
</dd>
</dl>
<h3>
<font color="blue">Parameters</font>
</h3>
<ul>
<li>
<tt>
<b>wname </b>
</tt>
: wavelet name
</li>
<li>
<tt>
<b>X </b>
</tt>
: reconstructed matrix
</li>
<li>
<tt>
<b>Lo_R </b>
</tt>
: lowpass synthesis filter
</li>
<li>
<tt>
<b>Hi_R </b>
</tt>
: highpass syntheis filter
</li>
<li>
<tt>
<b>S </b>
</tt>
: restruction size of row and column
</li>
<li>
<tt>
<b>CA </b>
</tt>
: approximation coefficent
</li>
<li>
<tt>
<b>CH </b>
</tt>
: horizontal detail coefficent
</li>
<li>
<tt>
<b>CV </b>
</tt>
: vertical detail coefficent
</li>
<li>
<tt>
<b>CD </b>
</tt>
: diagnoal detail coefficent
</li>
</ul>
<h3>
<font color="blue">Description</font>
</h3>
<p>
idwt2 is for two dimension inverse discrete fast wavelet transform. Coefficent could be void vector as '[]' for either of CA, CH, CV or CD.
</p>
<h3>
<font color="blue">Examples</font>
</h3>
<pre>
x=rand(100,100);
[CA,CH,CV,CD]=dwt2(x,'db2','mode','asymh');
x0=idwt2(CA,CH,CV,CD,'db2',[100 100]);
</pre>
<h3>
<font color="blue">Author</font>
</h3>
<p>Roger Liu and Isaac Zhi </p>
<h3>
<font color="blue">See Also</font>
</h3>
<p>
<a href="dwt2.htm">
<tt>
<b>dwt2</b>
</tt>
</a>, </p>
</body>
</html>
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