Revision: 56499
http://sourceforge.net/p/brlcad/code/56499
Author: mohitdaga
Date: 2013-08-03 10:46:14 +0000 (Sat, 03 Aug 2013)
Log Message:
-----------
Add under_sample function. This will be one of the methods to decimate an image.
Modified Paths:
--------------
brlcad/trunk/src/libicv/decimate.c
Modified: brlcad/trunk/src/libicv/decimate.c
===================================================================
--- brlcad/trunk/src/libicv/decimate.c 2013-08-03 10:00:44 UTC (rev 56498)
+++ brlcad/trunk/src/libicv/decimate.c 2013-08-03 10:46:14 UTC (rev 56499)
@@ -26,6 +26,7 @@
#include "bu.h"
#include "icv.h"
+#include "vmath.h"
HIDDEN void shrink_image(icv_image_t* bif, int factor)
{
@@ -66,6 +67,28 @@
}
+HIDDEN void under_sample(icv_image_t* bif, int factor)
+{
+ double *data_p, *res_p;
+ int x,y,widthstep;
+
+ widthstep = bif->width*bif->channels;
+
+ res_p = data_p = bif->data;
+
+ for (y=0; y<bif->height; y+=factor) {
+ data_p = bif->data + widthstep*y;
+ for (x=0; x<bif->width; x+=factor, res_p+=bif->channels,
data_p+=factor*bif->channels)
+ VMOVEN(res_p,data_p, bif->channels);
+ }
+
+ bif->width = (int) bif->width/factor;
+ bif->height = (int) bif->height/factor;
+ bif->data = bu_realloc(bif->data, (size_t)
(bif->width*bif->height*bif->channels), "under_sample : Reallocation");
+
+ return;
+}
+
/*
* Local Variables:
* tab-width: 8
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