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<td class="title">Demonstrations</td>
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<h1>mmdgear
<br>
<span class="subtitle">Detect the teeth of a gear
</span>
</h1>
<div class="descr">
<H2>Description</H2>
<div class="H2">
<p>
The input image is a binary image of a gear. The opening top-hat is used to detect the gear teeth. Finally, the teeth detected are labeled.
</p>
</div>
</div>
<div class="script">
<H2>Demo Script</H2>
<div class="H2">
<div class="slide">
<H3>Reading</H3>
<div class="H3">
<p>
<p>
The binary image of a gear is read.
</p>
<div class="example">
<div class="listing">
<pre class="user">>>> a = mmreadgray('gear.tif');</pre>
<pre class="computer"></pre>
<pre class="user">>>> mmshow(a);</pre>
<pre class="computer"></pre>
</div>
<table class="images">
<tbody align="center">
<tr class="image" valign="bottom">
<td><img width="139" src="../images/img_mmdgear_001.jpg"></td>
<td class="spare"></td>
</tr>
<tr class="title" valign="baseline">
<td><a href="../images/img_mmdgear_001.jpg">a</a></td>
<td class="spare"></td>
</tr>
</tbody>
</table>
</div>
</p>
</div>
</div>
<div class="slide">
<H3>Opening and subtraction</H3>
<div class="H3">
<p>
<p>
Opening of the input image by an Euclidean disk of radius 20. The sequence opening-subtraction is called opening top-hat. The opening top-hat could be executed in a single command: c =
<span class="fun">mmopenth</span>(a,
<span class="fun">mmsedisk</span>(20));
</p>
<div class="example">
<div class="listing">
<pre class="user">>>> b = mmopen(a,mmsedisk(20));</pre>
<pre class="computer"></pre>
<pre class="user">>>> mmshow(b);</pre>
<pre class="computer"></pre>
<pre class="user">>>> c = mmsubm(a,b);</pre>
<pre class="computer"></pre>
<pre class="user">>>> mmshow(c);</pre>
<pre class="computer"></pre>
</div>
<table class="images">
<tbody align="center">
<tr class="image" valign="bottom">
<td><img width="139" src="../images/img_mmdgear_002.jpg"></td>
<td><img width="139" src="../images/img_mmdgear_003.jpg"></td>
<td class="spare"></td>
</tr>
<tr class="title" valign="baseline">
<td><a href="../images/img_mmdgear_002.jpg">b</a></td>
<td><a href="../images/img_mmdgear_003.jpg">c</a></td>
<td class="spare"></td>
</tr>
</tbody>
</table>
</div>
</p>
</div>
</div>
<div class="slide">
<H3>Labeling and counting</H3>
<div class="H3">
<p>
<p>
The teeth detected are labeled. The maximum pixel value in the labeled image gives the number of connected objects (n. of teeth).
</p>
<div class="example">
<div class="listing">
<pre class="user">>>> d = mmlabel(c);</pre>
<pre class="computer"></pre>
<pre class="user">>>> nteeth=mmstats(d,'max')</pre>
<pre class="computer"></pre>
<pre class="user">>>> mmlblshow(d,'border');</pre>
<pre class="computer"></pre>
</div>
<table class="images">
<tbody align="center">
<tr class="image" valign="bottom">
<td><img width="139" src="../images/img_mmdgear_004.jpg"></td>
<td class="spare"></td>
</tr>
<tr class="title" valign="baseline">
<td><a href="../images/img_mmdgear_004.jpg">d,'border'</a></td>
<td class="spare"></td>
</tr>
</tbody>
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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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distrib
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Mandriva
>
2010.0
>
i586
>
media
>
contrib-release
>
by-pkgid
>
4a71d9984febeb5a206904a5a379841a
>
files
>
625
