Revision: 56325
http://sourceforge.net/p/brlcad/code/56325
Author: mohitdaga
Date: 2013-07-30 13:56:58 +0000 (Tue, 30 Jul 2013)
Log Message:
-----------
Adding icv_crop function. This can extract image from any quadrilateral part
and maps it to a rectangulare image.
Modified Paths:
--------------
brlcad/trunk/include/icv.h
brlcad/trunk/src/libicv/crop.c
Modified: brlcad/trunk/include/icv.h
===================================================================
--- brlcad/trunk/include/icv.h 2013-07-30 13:52:44 UTC (rev 56324)
+++ brlcad/trunk/include/icv.h 2013-07-30 13:56:58 UTC (rev 56325)
@@ -309,7 +309,34 @@
ICV_EXPORT extern int icv_rect(icv_image_t *img, int xorig, int yorig, int
xnum, int ynum);
+/**
+ * This function crops an input image.
+ * This can do a screwed cropping i.e given any four points of
+ * quadrilateral in an image, Maps it to a rectangle of xnumXynum
+ * dimension
+ *
+ * (ulx,uly) (urx,ury)
+ * __________________
+ * / |
+ * / |
+ * / |
+ * / |
+ * / |
+ * /______________________|
+ * (llx,lly) (lrx,lry)
+ *
+ * @return 0 on success on failure -1 and logs the error message.
+ */
+ICV_EXPORT extern int icv_crop(icv_image_t *img,
+ int ulx, int uly,
+ int urx, int ury,
+ int lrx, int lry,
+ int llx, int lly,
+ unsigned int ynum,
+ unsigned int xnum);
+
+
/** @} */
/* end image utilities */
Modified: brlcad/trunk/src/libicv/crop.c
===================================================================
--- brlcad/trunk/src/libicv/crop.c 2013-07-30 13:52:44 UTC (rev 56324)
+++ brlcad/trunk/src/libicv/crop.c 2013-07-30 13:56:58 UTC (rev 56325)
@@ -78,3 +78,40 @@
img->data = out_data;
return 0;
}
+
+int
+icv_crop(icv_image_t *img, int ulx, int uly, int urx, int ury, int lrx, int
lry, int llx, int lly, unsigned int ynum, unsigned int xnum)
+{
+ float x_1, y_1, x_2, y_2;
+ size_t row, col;
+ int x, y;
+ double *data, *p, *q;
+
+ /* Allocates output data and assigns to image*/
+ data = img->data;
+ img->data = p = bu_malloc(ynum*xnum*img->channels*sizeof(double),
"icv_crop: Out Image");
+
+ for (row = 0; row < ynum; row++) {
+ /* calculate left point of row */
+ x_1 = ((ulx-llx)/(fastf_t)(ynum-1)) * (fastf_t)row + llx;
+ y_1 = ((uly-lly)/(fastf_t)(ynum-1)) * (fastf_t)row + lly;
+ /* calculate right point of row */
+ x_2 = ((urx-lrx)/(fastf_t)(ynum-1)) * (fastf_t)row + lrx;
+ y_2 = ((ury-lry)/(fastf_t)(ynum-1)) * (fastf_t)row + lry;
+ for (col = 0; col < xnum; col++) {
+ /* calculate point along row */
+ x = (int)((x_2-x_1)/(fastf_t)(xnum-1)) * (fastf_t)col + x_1;
+ y = (int)((y_2-y_1)/(fastf_t)(xnum-1)) * (fastf_t)col + y_1;
+ /* Calculates the pointer to the data which has to be copied */
+ q = data + (img->width*y+x)*img->channels;
+ /* Moves pixel to the prescribed location */
+ VMOVEN(p,q,img->channels);
+ /* points to the next pointer where data is to be copied */
+ p += img->channels;
+ }
+ }
+ bu_free(data, "icv_crop : frees input image buffer");
+ img->width = xnum;
+ img->height = ynum;
+ return 0;
+}
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