[brlcad-commits] SF.net SVN: brlcad:[56498] brlcad/trunk/src/libicv

[<moh...@us...>]

Revision: 56498
          http://sourceforge.net/p/brlcad/code/56498
Author:   mohitdaga
Date:     2013-08-03 10:00:44 +0000 (Sat, 03 Aug 2013)
Log Message:
-----------
Adding libicv/decimate.c. This will contain all the srinking and decimating utilities. Also adding fuction shrink_image. This function uses box averaging to shrink an image.

Modified Paths:
--------------
    brlcad/trunk/src/libicv/CMakeLists.txt

Added Paths:
-----------
    brlcad/trunk/src/libicv/decimate.c

Modified: brlcad/trunk/src/libicv/CMakeLists.txt
===================================================================
--- brlcad/trunk/src/libicv/CMakeLists.txt	2013-08-03 08:43:33 UTC (rev 56497)
+++ brlcad/trunk/src/libicv/CMakeLists.txt	2013-08-03 10:00:44 UTC (rev 56498)
@@ -16,6 +16,7 @@
   encoding.c
   operations.c
   stat.c
+  decimate.c
   pix.c
   bw.c
   )

Added: brlcad/trunk/src/libicv/decimate.c
===================================================================
--- brlcad/trunk/src/libicv/decimate.c	                        (rev 0)
+++ brlcad/trunk/src/libicv/decimate.c	2013-08-03 10:00:44 UTC (rev 56498)
@@ -0,0 +1,77 @@
+/*                      D E C I M A T E . C
+ * BRL-CAD
+ *
+ * Copyright (c) 2013 United States Government as represented by
+ * the U.S. Army Research Laboratory.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this file; see the file named COPYING for more
+ * information.
+ */
+/** @file decimate.c
+ *
+ * This file contains routines to scale down an image to a lower
+ * resolution.
+ *
+ */
+
+#include "bu.h"
+#include "icv.h"
+
+HIDDEN void shrink_image(icv_image_t* bif, int factor)
+{
+    double *data_p, *res_p; /**< input and output pointers */
+    double *p;
+    int facsq,x,y,py,px,c;
+    size_t widthstep =  bif->width*bif->channels;
+
+    facsq = factor*factor,c;
+    res_p = bif->data;
+    p = bu_malloc(bif->channels*sizeof(double), "shrink_image : Pixel Values Temp Buffer");
+
+    for (y=0; y<bif->height; y+=factor)
+        for (x=0; x<bif->width; x+=factor) {
+
+            for (c=0; c<bif->channels; c++) {
+                p[c]= 0;
+            }
+
+            for (py = 0; py < factor; py++) {
+                data_p = bif->data + (y+py)*widthstep;
+                for (px = 0; px < factor; px++) {
+                    for (c=0; c<bif->channels; c++) {
+                        p[c] += *data_p++;
+                    }
+                }
+            }
+
+            for (c=0; c<bif->channels; c++)
+                *res_p++ = p[c]/facsq;
+        }
+
+    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), "shrink_image : Reallocation");
+
+    return;
+
+}
+
+/*
+ * Local Variables:
+ * tab-width: 8
+ * mode: C
+ * indent-tabs-mode: t
+ * c-file-style: "stroustrup"
+ * End:
+ * ex: shiftwidth=4 tabstop=8
+ */


Property changes on: brlcad/trunk/src/libicv/decimate.c
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