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/*====================================================================*
- 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.
*====================================================================*/
/*
* newspaper_seg.c
*
* Segmenting newspaper articles using morphology.
*
* Most of the work is done at 4x reduction (approx. 75 ppi),
* which makes it very fast.
*/
#ifdef HAVE_CONFIG_H
#include <config_auto.h>
#endif /* HAVE_CONFIG_H */
#include "allheaders.h"
int main(int argc,
char **argv)
{
l_int32 w, h;
BOXA *boxa;
PIX *pixs, *pixt, *pix1, *pix2, *pix3, *pix4, *pix5;
PIX *pix6, *pix7, *pix8, *pix9, *pix10, *pix11;
PIXA *pixa1, *pixa2;
PIXCMAP *cmap;
L_REGPARAMS *rp;
if (regTestSetup(argc, argv, &rp))
return 1;
pixs = pixRead("scots-frag.tif");
pixa1 = pixaCreate(12);
pixt = pixScaleToGray4(pixs);
pixaAddPix(pixa1, pixt, L_INSERT);
regTestWritePixAndCheck(rp, pixt, IFF_JFIF_JPEG); /* 0 */
/* Rank reduce 2x */
pix1 = pixReduceRankBinary2(pixs, 2, NULL);
pixt = pixScale(pix1, 0.5, 0.5);
pixaAddPix(pixa1, pixt, L_INSERT);
/* Open out the vertical lines */
pix2 = pixMorphSequence(pix1, "o1.50", 0);
pixt = pixScale(pix2, 0.5, 0.5);
pixaAddPix(pixa1, pixt, L_INSERT);
regTestWritePixAndCheck(rp, pixt, IFF_TIFF_G4); /* 1 */
pixDisplayWithTitle(pixt, 0, 0, "open vertical lines", rp->display);
/* Seedfill back to get those lines in their entirety */
pix3 = pixSeedfillBinary(NULL, pix2, pix1, 8);
pixt = pixScale(pix3, 0.5, 0.5);
pixaAddPix(pixa1, pixt, L_INSERT);
regTestWritePixAndCheck(rp, pixt, IFF_TIFF_G4); /* 2 */
pixDisplayWithTitle(pixt, 300, 0, "seedfill vertical", rp->display);
/* Remove the vertical lines (and some of the images) */
pixXor(pix2, pix1, pix3);
pixt = pixScale(pix2, 0.5, 0.5);
pixaAddPix(pixa1, pixt, L_INSERT);
regTestWritePixAndCheck(rp, pixt, IFF_TIFF_G4); /* 3 */
pixDisplayWithTitle(pixt, 600, 0, "remove vertical lines", rp->display);
/* Open out the horizontal lines */
pix4 = pixMorphSequence(pix2, "o50.1", 0);
pixt = pixScale(pix4, 0.5, 0.5);
pixaAddPix(pixa1, pixt, L_INSERT);
/* Seedfill back to get those lines in their entirety */
pix5 = pixSeedfillBinary(NULL, pix4, pix2, 8);
pixt = pixScale(pix5, 0.5, 0.5);
pixaAddPix(pixa1, pixt, L_INSERT);
regTestWritePixAndCheck(rp, pixt, IFF_TIFF_G4); /* 4 */
pixDisplayWithTitle(pixt, 900, 0, "seedfill horizontal", rp->display);
/* Remove the horizontal lines */
pixXor(pix4, pix2, pix5);
pixt = pixScale(pix4, 0.5, 0.5);
pixaAddPix(pixa1, pixt, L_INSERT);
regTestWritePixAndCheck(rp, pixt, IFF_TIFF_G4); /* 5 */
pixDisplayWithTitle(pixt, 1200, 0, "remove horiz lines", rp->display);
/* Invert and identify vertical gutters between text columns */
pix6 = pixReduceRankBinaryCascade(pix4, 1, 1, 0, 0);
pixInvert(pix6, pix6);
pixt = pixScale(pix6, 2.0, 2.0);
pixaAddPix(pixa1, pixt, L_INSERT);
regTestWritePixAndCheck(rp, pixt, IFF_TIFF_G4); /* 6 */
pixDisplayWithTitle(pixt, 1500, 0, NULL, rp->display);
pix7 = pixMorphSequence(pix6, "o1.50", 0);
pixt = pixScale(pix7, 2.0, 2.0);
pixaAddPix(pixa1, pixt, L_INSERT);
regTestWritePixAndCheck(rp, pixt, IFF_TIFF_G4); /* 7 */
pixDisplayWithTitle(pixt, 0, 300, "vertical gutters", rp->display);
pix8 = pixExpandBinaryPower2(pix7, 4); /* gutter mask */
regTestWritePixAndCheck(rp, pix8, IFF_TIFF_G4); /* 8 */
/* Solidify text blocks */
pix9 = pixMorphSequence(pix4, "c50.1 + c1.10", 0);
pixSubtract(pix9, pix9, pix8); /* preserve gutter */
pix10 = pixMorphSequence(pix9, "d3.3", 0);
pixt = pixScale(pix10, 0.5, 0.5);
pixaAddPix(pixa1, pixt, L_INSERT);
regTestWritePixAndCheck(rp, pixt, IFF_TIFF_G4); /* 9 */
pixDisplayWithTitle(pixt, 300, 300, "solidify text", rp->display);
/* Show stuff under this mask */
pixGetDimensions(pix10, &w, &h, NULL);
boxa = pixConnComp(pix10, &pixa2, 8);
pix11 = pixaDisplayRandomCmap(pixa2, w, h);
pixPaintThroughMask(pix11, pix4, 0, 0, 0);
pixt = pixScale(pix11, 0.5, 0.5);
pixaAddPix(pixa1, pixt, L_INSERT);
regTestWritePixAndCheck(rp, pixt, IFF_PNG); /* 10 */
pixDisplayWithTitle(pixt, 600, 300, "stuff under mask1", rp->display);
boxaDestroy(&boxa);
pixaDestroy(&pixa2);
/* Paint the background white */
cmap = pixGetColormap(pix11);
pixcmapResetColor(cmap, 0, 255, 255, 255);
regTestWritePixAndCheck(rp, pix11, IFF_PNG); /* 11 */
pixt = pixScale(pix11, 0.5, 0.5);
pixaAddPix(pixa1, pixt, L_INSERT);
regTestWritePixAndCheck(rp, pixt, IFF_PNG); /* 12 */
pixDisplayWithTitle(pixt, 900, 300, "stuff under mask2", rp->display);
pixaConvertToPdf(pixa1, 75, 1.0, 0, 0, "Segmentation: newspaper_reg",
"/tmp/lept/regout/newspaper.pdf");
L_INFO("Output pdf: /tmp/lept/regout/newspaper.pdf\n", rp->testname);
pixaDestroy(&pixa1);
pixDestroy(&pixs);
pixDestroy(&pix1);
pixDestroy(&pix2);
pixDestroy(&pix3);
pixDestroy(&pix4);
pixDestroy(&pix5);
pixDestroy(&pix6);
pixDestroy(&pix7);
pixDestroy(&pix8);
pixDestroy(&pix9);
pixDestroy(&pix10);
pixDestroy(&pix11);
return regTestCleanup(rp);
}
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