Revision: 56502
http://sourceforge.net/p/brlcad/code/56502
Author: mohitdaga
Date: 2013-08-03 17:45:38 +0000 (Sat, 03 Aug 2013)
Log Message:
-----------
Bilinear interpolation binterp for up scaling of images.
Modified Paths:
--------------
brlcad/trunk/src/libicv/decimate.c
Modified: brlcad/trunk/src/libicv/decimate.c
===================================================================
--- brlcad/trunk/src/libicv/decimate.c 2013-08-03 14:39:07 UTC (rev 56501)
+++ brlcad/trunk/src/libicv/decimate.c 2013-08-03 17:45:38 UTC (rev 56502)
@@ -129,7 +129,54 @@
return;
}
+HIDDEN void binterp(icv_image_t *bif, int out_width, int out_height)
+{
+ int i, j, c;
+ double x, y, dx, dy, mid1, mid2;
+ double xstep, ystep;
+ double *out_data, *out_p;
+ double *upp_r, *low_r; /*<< upper and lower row */
+ double *upp_c, *low_c;
+ int widthstep;
+ xstep = (double) (bif->width - 1) / (double)out_width - 1.0e-6;
+ ystep = (double) (bif->height -1) / (double)out_height - 1.0e-6;
+
+ out_p = out_data = bu_malloc(out_width*out_height*bif->channels, "binterp
: out data");
+
+ widthstep = bif->width*bif->channels;
+
+ for (j = 0; j < out_height; j++) {
+ y = j*ystep;
+ dy = y - (int)y;
+
+ low_r = bif->data + widthstep* (int)y;
+ upp_r = bif->data + widthstep* (int) (y+1);
+
+ for (i = 0; i < out_width; i++) {
+ x = i*xstep;
+ dx = x - (int)x;
+
+ upp_c = upp_r + (int)x*bif->channels;
+ low_c = low_r + (int)x*bif->channels;
+
+ for(c=0; c<bif->channels; c++) {
+ mid1 = low_c[0] + dx * ((double) low_c[bif->channels] -
(double) low_c[0] );
+ mid2 = upp_c[0] + dx * ((double) upp_c[bif->channels] -
(double) upp_c[0] );
+ *out_p = mid1 + dy * (mid2 - mid1);
+
+ out_p++;
+ upp_c++;
+ low_c++;
+ }
+ }
+ }
+ bu_free(bif->data, "binterep : Input Data");
+ bif->data = out_data;
+ bif->widht = out_width;
+ bif->height = bif->height;
+}
+
/*
* Local Variables:
* tab-width: 8
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