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<td class="title">Morphological Filters</td>
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<h1>mmasf
<br>
<span class="subtitle">Alternating Sequential Filtering
</span>
</h1>
<div class="synopsis">
<H2>Synopsis</H2>
<div class="H2">
<div class="prototype">y =
<span class="fun">mmasf</span>(
<span class="par">f</span>,
<span class="par">SEQ</span> = "OC",
<span class="par">b</span> = None,
<span class="par">n</span> = 1
)
</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">SEQ</span></td>
<td class="def"><span class="type"><a href="../mmtypes/mmString.html">String</a></span><p>'OC', 'CO', 'OCO', 'COC'.</p><p>Default:
<code>"OC"</code>
</p></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>
<tr>
<td class="term"><span class="par">n</span></td>
<td class="def"><span class="type"><a href="../mmtypes/mmDouble.html">Double</a></span> Non-negative integer.
<p>(number of iterations).</p><p>Default:
<code>1</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></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
<div class="descr">
<H2>Description</H2>
<div class="H2">
<p>
<span class="fun">mmasf</span> creates the image
<code>y</code> by filtering the image
<code>f</code> by
<code>n</code> iterations of the close and open alternating sequential filter characterized by the structuring element
<code>b</code>. The sequence of opening and closing is controlled by the parameter
<code>SEQ</code>. 'OC' performs opening after closing, 'CO' performs closing after opening, 'OCO' performs opening after closing after opening, and 'COC' performs closing after opening after closing.
</p>
</div>
</div>
<div class="examples">
<H2>Examples</H2>
<div class="H2">
<p>
<div class="bridge">Binary image:</div>
<div class="example">
<div class="listing">
<pre class="user">>>> f=mmreadgray('gear.tif')</pre>
<pre class="computer"></pre>
<pre class="user">>>> g=mmasf(f,'oc',mmsecross(),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_mmasf_001.jpg"></td>
<td><img width="139" src="../images/img_mmasf_002.jpg"></td>
<td class="spare"></td>
</tr>
<tr class="title" valign="baseline">
<td><a href="../images/img_mmasf_001.jpg">f</a></td>
<td><a href="../images/img_mmasf_002.jpg">g</a></td>
<td class="spare"></td>
</tr>
</tbody>
</table>
</div>
<div class="bridge">Gray-scale image:</div>
<div class="example">
<div class="listing">
<pre class="user">>>> f=mmreadgray('fabric.tif')</pre>
<pre class="computer"></pre>
<pre class="user">>>> g=mmasf(f,'oc',mmsecross(),3)</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="273" src="../images/img_mmasf_003.jpg"></td>
<td><img width="273" src="../images/img_mmasf_004.jpg"></td>
<td class="spare"></td>
</tr>
<tr class="title" valign="baseline">
<td><a href="../images/img_mmasf_003.jpg">f</a></td>
<td><a href="../images/img_mmasf_004.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">Case oc, close-open filter:</div>
<div class="eqfig">
<img src="../images/eq_mmasf001.png">
</div>
<div class="bridge">Case co, open-close filter:</div>
<div class="eqfig">
<img src="../images/eq_mmasf002.png">
</div>
<div class="bridge">Case oco:</div>
<div class="eqfig">
<img src="../images/eq_mmasf003.png">
</div>
<div class="bridge">Case coc:</div>
<div class="eqfig">
<img src="../images/eq_mmasf004.png">
</div>
</p>
</div>
</div>
<div class="sourcecode">
<H2>Source Code</H2>
<div class="H2">
<pre class="listing">
def mmasf(f, SEQ="OC", b=None, n=1):
from string import upper
if b is None: b = mmsecross()
SEQ=upper(SEQ)
y = f
if SEQ == 'OC':
for i in range(1,n+1):
nb = mmsesum(b,i)
y = mmopen(mmclose(y,nb),nb)
elif SEQ == 'CO':
for i in range(1,n+1):
nb = mmsesum(b,i)
y = mmclose(mmopen(y,nb),nb)
elif SEQ == 'OCO':
for i in range(1,n+1):
nb = mmsesum(b,i)
y = mmopen(mmclose(mmopen(y,nb),nb),nb)
elif SEQ == 'COC':
for i in range(1,n+1):
nb = mmsesum(b,i)
y = mmclose(mmopen(mmclose(y,nb),nb),nb)
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/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/mmopen.html">mmopen</a></td>
<td class="def">Morphological opening.</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/mmasfrec.html">mmasfrec</a></td>
<td class="def">Reconstructive Alternating Sequential Filtering</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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distrib
>
Mandriva
>
2010.0
>
i586
>
media
>
contrib-release
>
by-pkgid
>
4a71d9984febeb5a206904a5a379841a
>
files
>
658
