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<a href='#toc'>Table of Contents</a><p>
<h2><a name='sect0' href='#toc0'>Name</a></h2>
im_measure - measure colour patches off images
<h2><a name='sect1' href='#toc1'>Synopsis</a></h2>
#include <vips/vips.h>
<p> DOUBLEMASK *im_measure(in, box, h, v, sel, nsel, name) <br>
IMAGE *in; <br>
IMAGE_BOX *box; <br>
int h, v; <br>
int *sel; <br>
int nsel; <br>
char *name;
<p>
<h2><a name='sect2' href='#toc2'>Description</a></h2>
Analyse a grid of colour patches, producing a DOUBLEMASK
of averages. Pass an IMAGE, an IMAGE_BOX, the number of horizontal and vertical
patches, an array giving the numbers of the patches to measure (patches
are numbered left-to-right, top-to-bottom, starting with 1) and the name we
should give the output mask. Return a DOUBLEMASK in which rows are patches
and columns are bands. Only the central 50% of each patch is averaged.
<p> Example:
6 band image of 4x2 block of colour patches. <br>
+---+---+---+---+<br>
| 1 | 2 | 3 | 4 |<br>
+---+---+---+---+<br>
| 5 | 6 | 7 | 8 |<br>
+---+---+---+---+<br>
<p> Then call im_measure( im, box, 4, 2, { 2, 4 }, 2, "fred" ) makes a mask
"fred" which has 6 columns, two rows. The first row contains the averages
for patch 2, the second for patch 4.
<p> Output warnings: a warning is issued
if the standard deviation of any patch is greater than 20% of the mean
of that patch.
<p>
<h2><a name='sect3' href='#toc3'>Return Value</a></h2>
NULL on error.
<h2><a name='sect4' href='#toc4'>See Also</a></h2>
<a href='im_avg.3.html'>im_avg(3)</a>
, <a href='im_deviate.3.html'>im_deviate(3)</a>
,
<a href='im_stats.3.html'>im_stats(3)</a>
. <p>
<hr><p>
<a name='toc'><b>Table of Contents</b></a><p>
<ul>
<li><a name='toc0' href='#sect0'>Name</a></li>
<li><a name='toc1' href='#sect1'>Synopsis</a></li>
<li><a name='toc2' href='#sect2'>Description</a></li>
<li><a name='toc3' href='#sect3'>Return Value</a></li>
<li><a name='toc4' href='#sect4'>See Also</a></li>
</ul>
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distrib
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Mandriva
>
2010.0
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i586
>
media
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contrib-release
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by-pkgid
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7faa4cd12598db7d59564e3dc9a0913c
>
files
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391
