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<td class="title">Image Information and Manipulation</td>
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<h1>mmset2mat
<br>
<span class="subtitle">Converts image representation from set to matrix
</span>
</h1>
<div class="synopsis">
<H2>Synopsis</H2>
<div class="H2">
<div class="prototype">M =
<span class="fun">mmset2mat</span>(
<span class="par">A</span>
)
</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">A</span></td>
<td class="def"><span class="type"><a href="../mmtypes/mmImage.html">Image</a></span><p>Tuple with array of pixel coordinates and optional array of corresponding pixel values</p></td>
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<div class="output">
<H3>Output</H3>
<div class="H3">
<table class="deflist">
<tbody valign="baseline">
<tr>
<td class="term"><span class="par">M</span></td>
<td class="def"><span class="type"><a href="../mmtypes/mmImage.html">Image</a></span><p>Image in matrix format, origin (0,0) at the matrix center</p></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
<div class="descr">
<H2>Description</H2>
<div class="H2">
<p>
Return an image in the matrix format built from a tuple of an array of pixel coordinates and a corresponding array of pixel values
</p>
</div>
</div>
<div class="examples">
<H2>Examples</H2>
<div class="H2">
<p>
<div class="example">
<div class="listing">
<pre class="user">>>> coord=int32([
[ 0,0],
[-1,0],
[ 1,1]])</pre>
<pre class="computer"></pre>
<pre class="user">>>> A=mmset2mat((coord,))</pre>
<pre class="computer"></pre>
<pre class="user">>>> print A</pre>
<pre class="computer">[[0 1 0]
[0 1 0]
[0 0 1]]</pre>
<pre class="user">>>> print mmdatatype(A)</pre>
<pre class="computer">binary</pre>
<pre class="user">>>> vu = uint8([1,2,3])</pre>
<pre class="computer"></pre>
<pre class="user">>>> f=mmset2mat((coord,vu))</pre>
<pre class="computer"></pre>
<pre class="user">>>> print f</pre>
<pre class="computer">[[0 2 0]
[0 1 0]
[0 0 3]]</pre>
<pre class="user">>>> print mmdatatype(f)</pre>
<pre class="computer">uint8</pre>
<pre class="user">>>> vi = int32([1,2,3])</pre>
<pre class="computer"></pre>
<pre class="user">>>> g=mmset2mat((coord,vi))</pre>
<pre class="computer"></pre>
<pre class="user">>>> print g</pre>
<pre class="computer">[[-2147483647 2 -2147483647]
[-2147483647 1 -2147483647]
[-2147483647 -2147483647 3]]</pre>
<pre class="user">>>> print mmdatatype(g)</pre>
<pre class="computer">int32</pre>
</div>
</div>
</p>
</div>
</div>
<div class="sourcecode">
<H2>Source Code</H2>
<div class="H2">
<pre class="listing">
def mmset2mat(A):
from MLab import max
from Numeric import put, ones, ravel, shape, NewAxis, array, asarray
if len(A) == 2:
x, v = A
v = asarray(v)
elif len(A) == 1:
x = A[0]
v = ones((len(x),), '1')
else:
raise TypeError, 'Argument must be a tuple of length 1 or 2'
if len(x) == 0: return array([0]).astype(v.typecode())
if len(x.shape) == 1: x = x[NewAxis,:]
dh,dw = max(abs(x))
h,w = (2*dh)+1, (2*dw)+1
M=ones((h,w)) * mmlimits(v)[0]
offset = x[:,0] * w + x[:,1] + (dh*w + dw)
put(M,offset,v)
M = M.astype(v.typecode())
return M
</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/mmmat2set.html">mmmat2set</a></td>
<td class="def">Converts image representation from matrix to set</td>
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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
>
739
