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<html>
  <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>,&nbsp;&nbsp;</p>
  </body>
</html>