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<html><head><title>R: Ridge Chaining Procedure</title>
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<table width="100%" summary="page for cfamily {Rwave}"><tr><td>cfamily {Rwave}</td><td align="right">R Documentation</td></tr></table>
<h2>Ridge Chaining Procedure</h2>
<h3>Description</h3>
<p>
Chains the ridge estimates produced by the function <code><a href="crc.html">crc</a></code>.
</p>
<h3>Usage</h3>
<pre>
cfamily(ccridge, bstep=1, nbchain=100, ptile=0.05)
</pre>
<h3>Arguments</h3>
<table summary="R argblock">
<tr valign="top"><td><code>ccridge</code></td>
<td>
unchained ridge set as the output of the function <code><a href="crc.html">crc</a></code>
</td></tr>
<tr valign="top"><td><code>bstep</code></td>
<td>
maximal length for a gap in a ridge.
</td></tr>
<tr valign="top"><td><code>nbchain</code></td>
<td>
maximal number of chains produced by the function.
</td></tr>
<tr valign="top"><td><code>ptile</code></td>
<td>
relative threshold for the ridges.
</td></tr>
</table>
<h3>Details</h3>
<p>
<code><a href="crc.html">crc</a></code> returns a measure in time-frequency (or time-scale)
space. <code><a href="cfamily.html">cfamily</a></code> turns it into a series of one-dimensional
objects (ridges). The measure is first thresholded, with a relative
threshold value set to the input parameter ptile. During the chaining
procedure, gaps within a given ridge are allowed and filled in. The
maximal length of such gaps is the input parameter bstep.
</p>
<h3>Value</h3>
<p>
Returns the results of the chaining algorithm
</p>
<table summary="R argblock">
<tr valign="top"><td><code>ordered map</code></td>
<td>
image containing the ridges (displayed with different colors)
</td></tr>
<tr valign="top"><td><code>chain</code></td>
<td>
2D array containing the chained ridges, according to the chain data
structure<br>
chain[,1]: first point of the ridge<br>
chain[,2]: length of the chain<br>
chain[,3:(chain[,2]+2)]: values of the ridge<br>
</td></tr>
<tr valign="top"><td><code>nbchain</code></td>
<td>
number of chains produced by the algorithm
</td></tr>
</table>
<h3>References</h3>
<p>
See discussion in text of ``Practical Time-Frequency Analysis''.
</p>
<h3>See Also</h3>
<p>
<code><a href="crc.html">crc</a></code> for the ridge estimation, and <code><a href="crcrec.html">crcrec</a></code>,
<code><a href="gcrcrec.html">gcrcrec</a></code> and <code><a href="scrcrec.html">scrcrec</a></code> for corresponding
reconstruction functions.
</p>
<hr><div align="center">[Package <em>Rwave</em> version 1.24 <a href="00Index.html">Index]</a></div>
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