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<td class="title">Thinning And Thickening</td>
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<h1>mmwatershed
<br>
<span class="subtitle">Watershed detection.
</span>
</h1>
<div class="synopsis">
<H2>Synopsis</H2>
<div class="H2">
<div class="prototype">y =
<span class="fun">mmwatershed</span>(
<span class="par">f</span>,
<span class="par">Bc</span> = None,
<span class="par">LINEREG</span> = "LINES"
)
</div>
<p>Implemented in
<b>Python.</b>
</p>
<div class="input">
<H3>Input</H3>
<div class="H3">
<table class="deflist">
<tbody valign="baseline">
<tr>
<td class="term"><span class="par">f</span></td>
<td class="def"><span class="type"><a href="../mmtypes/mmImage.html">Image</a></span> Gray-scale (uint8 or uint16) or binary image.
</td>
</tr>
<tr>
<td class="term"><span class="par">Bc</span></td>
<td class="def"><span class="type"><a href="../mmtypes/mmSe.html">Structuring Element</a></span><p>( connectivity)</p><p>Default:
<code>None</code> (3x3 elementary cross)
</p></td>
</tr>
<tr>
<td class="term"><span class="par">LINEREG</span></td>
<td class="def"><span class="type"><a href="../mmtypes/mmString.html">String</a></span><p>'LINES' or ' REGIONS'.</p><p>Default:
<code>"LINES"</code>
</p></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="output">
<H3>Output</H3>
<div class="H3">
<table class="deflist">
<tbody valign="baseline">
<tr>
<td class="term"><span class="par">y</span></td>
<td class="def"><span class="type"><a href="../mmtypes/mmImage.html">Image</a></span> Gray-scale (uint8 or uint16) or binary image.
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
<div class="descr">
<H2>Description</H2>
<div class="H2">
<p>
<span class="fun">mmwatershed</span> creates the image
<code>y</code> by detecting the domain of the catchment basins of
<code>f</code>, according to the connectivity defined by
<code>Bc</code>. According to the flag LINEREG
<code>y</code> will be a labeled image of the catchment basins domain or just a binary image that presents the watershed lines. The implementation of this function is based on VincSoil:91.
</p>
</div>
</div>
<div class="examples">
<H2>Examples</H2>
<div class="H2">
<p>
<div class="example">
<div class="listing">
<pre class="user">>>> f=mmreadgray('astablet.tif')</pre>
<pre class="computer"></pre>
<pre class="user">>>> grad=mmgradm(f)</pre>
<pre class="computer"></pre>
<pre class="user">>>> w1=mmwatershed(grad,mmsebox())</pre>
<pre class="computer"></pre>
<pre class="user">>>> w2=mmwatershed(grad,mmsebox(),'REGIONS')</pre>
<pre class="computer"></pre>
<pre class="user">>>> mmshow(grad)</pre>
<pre class="computer"></pre>
<pre class="user">>>> mmshow(w1)</pre>
<pre class="computer"></pre>
<pre class="user">>>> mmlblshow(w2)</pre>
<pre class="computer"></pre>
</div>
<table class="images">
<tbody align="center">
<tr class="image" valign="bottom">
<td><img width="251" src="../images/img_mmwatershed_001.jpg"></td>
<td><img width="251" src="../images/img_mmwatershed_002.jpg"></td>
<td class="spare"></td>
</tr>
<tr class="title" valign="baseline">
<td><a href="../images/img_mmwatershed_001.jpg">grad</a></td>
<td><a href="../images/img_mmwatershed_002.jpg">w1</a></td>
<td class="spare"></td>
</tr>
</tbody>
</table>
<table class="images">
<tbody align="center">
<tr class="image" valign="bottom">
<td><img width="251" src="../images/img_mmwatershed_003.jpg"></td>
<td class="spare"></td>
</tr>
<tr class="title" valign="baseline">
<td><a href="../images/img_mmwatershed_003.jpg">w2</a></td>
<td class="spare"></td>
</tr>
</tbody>
</table>
</div>
</p>
</div>
</div>
<div class="descr">
<H2>Limitations</H2>
<div class="H2">
<p>
The structuring elements allowed are the elementary cross (4-connected) and the elementary square (8-connected).
</p>
</div>
</div>
<div class="sourcecode">
<H2>Source Code</H2>
<div class="H2">
<pre class="listing">
def mmwatershed(f, Bc=None, LINEREG="LINES"):
from string import upper
if Bc is None: Bc = mmsecross()
return mmcwatershed(f,mmregmin(f,Bc),upper(LINEREG))
return y
</pre>
</div>
</div>
<div class="seealso">
<H2>See also</H2>
<div class="H2">
<table class="deflist">
<tbody valign="baseline">
<tr>
<td class="term"><a href="../morph/mmcwatershed.html">mmcwatershed</a></td>
<td class="def">Detection of watershed from markers.</td>
</tr>
<tr>
<td class="term"><a href="../morph/mmfreedom.html">mmfreedom</a></td>
<td class="def">Control automatic data type conversion.</td>
</tr>
<tr>
<td class="term"><a href="../morph/mmsebox.html">mmsebox</a></td>
<td class="def">Create a box structuring element.</td>
</tr>
<tr>
<td class="term"><a href="../morph/mmsecross.html">mmsecross</a></td>
<td class="def">Diamond structuring element and elementary 3x3 cross.</td>
</tr>
<tr>
<td class="term"><a href="../morph/mmswatershed.html">mmswatershed</a></td>
<td class="def">Detection of similarity-based watershed from markers.</td>
</tr>
</tbody>
</table>
</div>
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<td class="copyright">Copyright (c) 2003, Roberto A. Lotufo, UNICAMP-University of Campinas; Rubens C. Machado, CenPRA-Renato Archer Research Center.</td>
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