scilab-swt 0.1.0rc4-5 / usr / lib / scilab-swt / man / idwt2.htm

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

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