third-party/leptonica/prog/showedges.c
/*====================================================================*
- Copyright (C) 2001 Leptonica. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- 2. Redistributions in binary form must reproduce the above
- copyright notice, this list of conditions and the following
- disclaimer in the documentation and/or other materials
- provided with the distribution.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANY
- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*====================================================================*/
/*
* showedges.c
*
* Uses computation of half edge function, along with thresholding.
*/
#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 */
int main(int argc,
char **argv)
{
char *infile, *outfile;
l_int32 d;
PIX *pixs, *pixgr, *pixb;
static char mainName[] = "showedges";
if (argc != 3)
return 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)
return 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);
return 0;
}