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<title>mmcenter</title>
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<td class="index">
[<a href="../morph/mmero.html"><tt>mmero</tt></a>]
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<td class="title">Morphological Filters</td>
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</table>
<h1>mmcenter
<br>
<span class="subtitle">Center filter.
</span>
</h1>
<div class="synopsis">
<H2>Synopsis</H2>
<div class="H2">
<div class="prototype">y =
<span class="fun">mmcenter</span>(
<span class="par">f</span>,
<span class="par">b</span> = None
)
</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">b</span></td>
<td class="def"><span class="type"><a href="../mmtypes/mmSe.html">Structuring Element</a></span><p>Default:
<code>None</code> (3x3 elementary cross)
</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></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
<div class="descr">
<H2>Description</H2>
<div class="H2">
<p>
<span class="fun">mmcenter</span> creates the image
<code>y</code> by computing recursively the morphological center, relative to the structuring element
<code>b</code>, of the image
<code>f</code> .
</p>
</div>
</div>
<div class="examples">
<H2>Examples</H2>
<div class="H2">
<p>
<div class="example">
<div class="listing">
<pre class="user">>>> f=mmreadgray('gear.tif')</pre>
<pre class="computer"></pre>
<pre class="user">>>> g=mmcenter(f,mmsedisk(2))</pre>
<pre class="computer"></pre>
<pre class="user">>>> mmshow(f)</pre>
<pre class="computer"></pre>
<pre class="user">>>> mmshow(g)</pre>
<pre class="computer"></pre>
</div>
<table class="images">
<tbody align="center">
<tr class="image" valign="bottom">
<td><img width="139" src="../images/img_mmcenter_001.jpg"></td>
<td><img width="139" src="../images/img_mmcenter_002.jpg"></td>
<td class="spare"></td>
</tr>
<tr class="title" valign="baseline">
<td><a href="../images/img_mmcenter_001.jpg">f</a></td>
<td><a href="../images/img_mmcenter_002.jpg">g</a></td>
<td class="spare"></td>
</tr>
</tbody>
</table>
</div>
</p>
</div>
</div>
<div class="equation">
<H2>Equation</H2>
<div class="H2">
<p>
<div class="bridge">Center filter primitive:</div>
<div class="eqfig">
<img src="../images/eq_mmcenter001.png">
</div>
<div class="bridge">Center filter:</div>
<div class="eqfig">
<img src="../images/eq_mmcenter002.png">
</div>
</p>
</div>
</div>
<div class="sourcecode">
<H2>Source Code</H2>
<div class="H2">
<pre class="listing">
def mmcenter(f, b=None):
if b is None: b = mmsecross()
y = f
diff = 0
while not diff:
aux = y
beta1 = mmasf(y,'COC',b,1)
beta2 = mmasf(y,'OCO',b,1)
y = mmunion(mmintersec(y,beta1),beta2)
diff = mmisequal(aux,y)
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/mmfreedom.html">mmfreedom</a></td>
<td class="def">Control automatic data type conversion.</td>
</tr>
<tr>
<td class="term"><a href="../morph/mmclose.html">mmclose</a></td>
<td class="def">Morphological closing.</td>
</tr>
<tr>
<td class="term"><a href="../morph/mmopen.html">mmopen</a></td>
<td class="def">Morphological opening.</td>
</tr>
<tr>
<td class="term"><a href="../morph/mmimg2se.html">mmimg2se</a></td>
<td class="def">Create a structuring element from a pair of images.</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>
</tbody>
</table>
</div>
</div>
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<tr>
<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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distrib
>
Mandriva
>
2010.0
>
i586
>
media
>
contrib-release
>
by-pkgid
>
4a71d9984febeb5a206904a5a379841a
>
files
>
665
