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<head>
<title>dwt2</title>
</head>
<body bgcolor="#FFFFFF">
<center>Scilab Wavelet Toolbox Function </center>
<div align="right">Last update : June 2007 </div>
<p>
<b>dwt2</b> - Two Dimensional Discrete Fast Wavelet Transform </p>
<h3>
<font color="blue">Calling Sequence</font>
</h3>
<dl>
<dd>
<tt>[CA,CH,CV,CD]=dwt2(x,wname,['mode',extMethod])</tt>
</dd>
<dd>
<tt>[CA,CH,CV,CD]=dwt2(x,Lo_D,Hi_D,['mode',extMethod])</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>
: double matrix
</li>
<li>
<tt>
<b>Lo_D </b>
</tt>
: lowpass analysis filter
</li>
<li>
<tt>
<b>Hi_D </b>
</tt>
: highpass analysis filter
</li>
<li>
<tt>
<b>extMethod </b>
</tt>
: extension mode, 'zpd' for example
</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>
: diagonal detail coefficent
</li>
</ul>
<h3>
<font color="blue">Description</font>
</h3>
<p>
dwt2 is for two dimension discrete fast wavelet transform with the signal extension method optional argument.
</p>
<h3>
<font color="blue">Examples</font>
</h3>
<pre>
x=rand(100,100);
[CA,CH,CV,CD]=dwt2(x,'db2','mode','asymh');
</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="idwt2.htm">
<tt>
<b>idwt2</b>
</tt>
</a>, </p>
</body>
</html>
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