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<td class="title">Data Type Conversion</td>
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<h1>mmgray
<br>
<span class="subtitle">Convert a binary image into a gray-scale image.
</span>
</h1>
<div class="synopsis">
<H2>Synopsis</H2>
<div class="H2">
<div class="prototype">y =
<span class="fun">mmgray</span>(
<span class="par">f</span>,
<span class="par">TYPE</span> = "uint8",
<span class="par">k1</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> Binary image.
</td>
</tr>
<tr>
<td class="term"><span class="par">TYPE</span></td>
<td class="def"><span class="type"><a href="../mmtypes/mmString.html">String</a></span><p>'uint8', 'uint16', or 'int32'.</p><p>Default:
<code>"uint8"</code>
</p></td>
</tr>
<tr>
<td class="term"><span class="par">k1</span></td>
<td class="def"><span class="type"><a href="../mmtypes/mmDouble.html">Double</a></span> Non-negative integer.
<p>Default:
<code>None</code> (Maximum pixel level in pixel type)
</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> Unsigned gray-scale (uint8 or uint16), signed (int32) or binary image.
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
<div class="descr">
<H2>Description</H2>
<div class="H2">
<p>
<span class="fun">mmgray</span> converts a binary image into a gray-scale image of a specified data type. The value
<code>k1</code> is assigned to the 1 pixels of
<code>f</code>, while the 0 pixels are assigned to the minimum value associated to the specified data type.
</p>
</div>
</div>
<div class="examples">
<H2>Examples</H2>
<div class="H2">
<p>
<div class="example">
<div class="listing">
<pre class="user">>>> b=mmbinary([0, 1, 0, 1])</pre>
<pre class="computer"></pre>
<pre class="user">>>> print b</pre>
<pre class="computer">[0 1 0 1]</pre>
<pre class="user">>>> c=mmgray(b)</pre>
<pre class="computer"></pre>
<pre class="user">>>> print c</pre>
<pre class="computer">[ 0 255 0 255]</pre>
<pre class="user">>>> d=mmgray(b,'uint8',100)</pre>
<pre class="computer"></pre>
<pre class="user">>>> print d</pre>
<pre class="computer">[ 0 100 0 100]</pre>
<pre class="user">>>> e=mmgray(b,'uint16')</pre>
<pre class="computer"></pre>
<pre class="user">>>> print e</pre>
<pre class="computer">[ 0 65535 0 65535]</pre>
<pre class="user">>>> f=mmgray(b,'int32',0)</pre>
<pre class="computer"></pre>
<pre class="user">>>> print f</pre>
<pre class="computer">[-2147483647 0 -2147483647 0]</pre>
</div>
</div>
</p>
</div>
</div>
<div class="equation">
<H2>Equation</H2>
<div class="H2">
<p>
<div class="eqfig">
<img src="../images/eq_mmgray001.png">
</div>
</p>
</div>
</div>
<div class="sourcecode">
<H2>Source Code</H2>
<div class="H2">
<pre class="listing">
def mmgray(f, TYPE="uint8", k1=None):
from Numeric import array
if k1 is None: k1 = mmmaxleveltype(TYPE)
if type(f) is list: f = mmbinary(f)
assert mmis(f,'binary'), 'f must be binary'
if k1==None:
k1=mmmaxleveltype(TYPE)
if TYPE == 'uint8' : y = uint8(f*k1)
elif TYPE == 'uint16': y = uint16(f*k1)
elif TYPE == 'int32' : y = int32(f*k1) - int32(mmneg(f)*mmmaxleveltype(TYPE))
else:
assert 0, 'type not supported:'+TYPE
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/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/mmthreshad.html">mmthreshad</a></td>
<td class="def">Threshold (adaptive)</td>
</tr>
<tr>
<td class="term"><a href="../morph/mmis.html">mmis</a></td>
<td class="def">Verify if a relationship among images is true or false.</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
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Mandriva
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2010.0
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i586
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media
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contrib-release
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by-pkgid
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