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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.
*====================================================================*/
/*
* lineremoval.c
*
* Use with dave-orig.png
*/
#include <stdio.h>
#include <stdlib.h>
#include "allheaders.h"
main(int argc,
char **argv)
{
char *filein;
l_float32 angle, conf, deg2rad;
PIX *pixs, *pix1, *pix2, *pix3, *pix4, *pix5;
PIX *pix6, *pix7, *pix8, *pix9;
static char mainName[] = "lineremoval";
if (argc != 2)
exit(ERROR_INT(" Syntax: lineremoval filein", mainName, 1));
filein = argv[1];
deg2rad = 3.14159 / 180.;
if ((pixs = pixRead(filein)) == NULL)
exit(ERROR_INT("pix not made", mainName, 1));
/* threshold to binary, extracting much of the lines */
pix1 = pixThresholdToBinary(pixs, 170);
pixWrite("dave-proc1.png", pix1, IFF_PNG);
pixDisplayWrite(pix1, 1);
/* find the skew angle and deskew using an interpolated
* rotator for anti-aliasing (to avoid jaggies) */
pixFindSkew(pix1, &angle, &conf);
pix2 = pixRotateAMGray(pixs, deg2rad * angle, 255);
pixWrite("dave-proc2.png", pix2, IFF_PNG);
pixDisplayWrite(pix2, 1);
/* extract the lines to be removed */
pix3 = pixCloseGray(pix2, 51, 1);
pixWrite("dave-proc3.png", pix3, IFF_PNG);
pixDisplayWrite(pix3, 1);
/* solidify the lines to be removed */
pix4 = pixErodeGray(pix3, 1, 5);
pixWrite("dave-proc4.png", pix4, IFF_PNG);
pixDisplayWrite(pix4, 1);
/* clean the background of those lines */
pix5 = pixThresholdToValue(NULL, pix4, 210, 255);
pixWrite("dave-proc5.png", pix5, IFF_PNG);
pixDisplayWrite(pix5, 1);
pix6 = pixThresholdToValue(NULL, pix5, 200, 0);
pixWrite("dave-proc6.png", pix6, IFF_PNG);
pixDisplayWrite(pix6, 1);
/* get paint-through mask for changed pixels */
pix7 = pixThresholdToBinary(pix6, 210);
pixWrite("dave-proc7.png", pix7, IFF_PNG);
pixDisplayWrite(pix7, 1);
/* add the inverted, cleaned lines to orig. Because
* the background was cleaned, the inversion is 0,
* so when you add, it doesn't lighten those pixels.
* It only lightens (to white) the pixels in the lines! */
pixInvert(pix6, pix6);
pix8 = pixAddGray(NULL, pix2, pix6);
pixWrite("dave-proc8.png", pix8, IFF_PNG);
pixDisplayWrite(pix8, 1);
pix9 = pixOpenGray(pix8, 1, 9);
pixWrite("dave-proc9.png", pix9, IFF_PNG);
pixDisplayWrite(pix9, 1);
pixCombineMasked(pix8, pix9, pix7);
pixWrite("dave-result.png", pix8, IFF_PNG);
pixDisplayWrite(pix8, 1);
system("/usr/bin/gthumb junk_write_display* &");
return 0;
}
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