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<h1>mmthreshad
<br>
<span class="subtitle">Threshold (adaptive)
</span>
</h1>
<div class="synopsis">
<H2>Synopsis</H2>
<div class="H2">
<div class="prototype">y =
<span class="fun">mmthreshad</span>(
<span class="par">f</span>,
<span class="par">f1</span>,
<span class="par">f2</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) image.
</td>
</tr>
<tr>
<td class="term"><span class="par">f1</span></td>
<td class="def"><span class="type"><a href="../mmtypes/mmImage.html">Image</a></span> Gray-scale (uint8 or uint16) image.
<p>lower value</p></td>
</tr>
<tr>
<td class="term"><span class="par">f2</span></td>
<td class="def"><span class="type"><a href="../mmtypes/mmImage.html">Image</a></span> Gray-scale (uint8 or uint16) image.
<p>upper value</p><p>Default:
<code>None</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> Binary image.
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
<div class="descr">
<H2>Description</H2>
<div class="H2">
<p>
<span class="fun">mmthreshad</span> creates the image
<code>y</code> as the threshold of the image
<code>f</code> by the images
<code>f1</code> and
<code>f2</code>. A pixel in
<code>y</code> has the value 1 when the value of the corresponding pixel in
<code>f</code> is between the values of the corresponding pixels in
<code>f1</code> and
<code>f2</code>.
</p>
</div>
</div>
<div class="examples">
<H2>Examples</H2>
<div class="H2">
<p>
<div class="example">
<div class="listing">
<pre class="user">>>> a = mmreadgray('keyb.tif')</pre>
<pre class="computer"></pre>
<pre class="user">>>> mmshow(a)</pre>
<pre class="computer"></pre>
<pre class="user">>>> b = mmthreshad(a,uint8(10), uint8(50))</pre>
<pre class="computer"></pre>
<pre class="user">>>> mmshow(b)</pre>
<pre class="computer"></pre>
<pre class="user">>>> c = mmthreshad(a,238)</pre>
<pre class="computer">Warning: Converting input image from int32 to uint8.</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="295" src="../images/img_mmthreshad_001.jpg"></td>
<td><img width="295" src="../images/img_mmthreshad_002.jpg"></td>
<td class="spare"></td>
</tr>
<tr class="title" valign="baseline">
<td><a href="../images/img_mmthreshad_001.jpg">a</a></td>
<td><a href="../images/img_mmthreshad_002.jpg">b</a></td>
<td class="spare"></td>
</tr>
</tbody>
</table>
<table class="images">
<tbody align="center">
<tr class="image" valign="bottom">
<td><img width="295" src="../images/img_mmthreshad_003.jpg"></td>
<td class="spare"></td>
</tr>
<tr class="title" valign="baseline">
<td><a href="../images/img_mmthreshad_003.jpg">c</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="eqfig">
<img src="../images/eq_mmthreshad001.png">
</div>
</p>
</div>
</div>
<div class="sourcecode">
<H2>Source Code</H2>
<div class="H2">
<pre class="listing">
def mmthreshad(f, f1, f2=None):
if f2 is None:
y = mmbinary(f1 <= f)
else:
y = mmbinary((f1 <= f) & (f <= f2))
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/mmgray.html">mmgray</a></td>
<td class="def">Convert a binary image into a gray-scale image.</td>
</tr>
<tr>
<td class="term"><a href="../morph/mmbinary.html">mmbinary</a></td>
<td class="def">Convert a gray-scale image into a binary image</td>
</tr>
<tr>
<td class="term"><a href="../morph/mmcmp.html">mmcmp</a></td>
<td class="def">Compare two images pixelwisely.</td>
</tr>
</tbody>
</table>
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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
>
Mandriva
>
2010.0
>
i586
>
media
>
contrib-release
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by-pkgid
>
4a71d9984febeb5a206904a5a379841a
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756
