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/*====================================================================*
- Copyright (C) 2001 Leptonica. All rights reserved.
- This software is distributed in the hope that it will be
- useful, but with NO WARRANTY OF ANY KIND.
- No author or distributor accepts responsibility to anyone for the
- consequences of using this software, or for whether it serves any
- particular purpose or works at all, unless he or she says so in
- writing. Everyone is granted permission to copy, modify and
- redistribute this source code, for commercial or non-commercial
- purposes, with the following restrictions: (1) the origin of this
- source code must not be misrepresented; (2) modified versions must
- be plainly marked as such; and (3) this notice may not be removed
- or altered from any source or modified source distribution.
*====================================================================*/
/*
* showedges.c
*
* Uses computation of half edge function, along with thresholding.
*/
#include <stdio.h>
#include <stdlib.h>
#include "allheaders.h"
#define SMOOTH_WIDTH_1 2 /* must be smaller */
#define SMOOTH_WIDTH_2 4 /* must be larger */
#define THRESHOLD 5 /* low works best */
main(int argc,
char **argv)
{
char *infile, *outfile;
l_int32 d;
PIX *pixs, *pixgr, *pixb;
static char mainName[] = "showedges";
if (argc != 3)
exit(ERROR_INT(" Syntax: showedges infile outfile", mainName, 1));
infile = argv[1];
outfile = argv[2];
pixs = pixRead(infile);
d = pixGetDepth(pixs);
if (d != 8 && d != 32)
exit(ERROR_INT("d not 8 or 32 bpp", mainName, 1));
pixgr = pixHalfEdgeByBandpass(pixs, SMOOTH_WIDTH_1, SMOOTH_WIDTH_1,
SMOOTH_WIDTH_2, SMOOTH_WIDTH_2);
pixb = pixThresholdToBinary(pixgr, THRESHOLD);
pixInvert(pixb, pixb);
/* pixWrite("junkpixgr", pixgr, IFF_JFIF_JPEG); */
pixWrite(outfile, pixb, IFF_PNG);
exit(0);
}
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