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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.
*====================================================================*/
/*
* comparepages.c
*
* This compares text pages using the location of word bounding boxes.
* The goal is to get a fast and robust determination for whether
* two pages are the same.
*/
#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, n, same;
BOXA *boxa1, *boxa2;
NUMA *nai1, *nai2;
NUMAA *naa1, *naa2;
PIX *pixs, *pixt, *pixb1, *pixb2;
setLeptDebugOK(1);
lept_mkdir("lept/comp");
pixs = pixRead("lucasta.047.jpg");
pixb1 = pixConvertTo1(pixs, 128);
pixGetWordBoxesInTextlines(pixb1, 10, 10, 500, 50, &boxa1, &nai1);
pixt = pixDrawBoxaRandom(pixs, boxa1, 2);
pixDisplay(pixt, 100, 100);
pixWrite("/tmp/lept/comp/pixt.png", pixt, IFF_PNG);
naa1 = boxaExtractSortedPattern(boxa1, nai1);
numaaWrite("/tmp/lept/comp/naa1.naa", naa1);
n = numaaGetCount(naa1);
lept_stderr("Number of textlines = %d\n", n);
pixDisplay(pixb1, 300, 0);
/* Translate */
pixb2 = pixCreateTemplate(pixb1);
pixGetDimensions(pixb1, &w, &h, NULL);
pixRasterop(pixb2, 148, 133, w, h, PIX_SRC, pixb1, 0, 0);
pixDisplay(pixb2, 600, 0);
pixGetWordBoxesInTextlines(pixb2, 10, 10, 500, 50, &boxa2, &nai2);
naa2 = boxaExtractSortedPattern(boxa2, nai2);
numaaCompareImagesByBoxes(naa1, naa2, 5, 10, 150, 150, 20, 20, &same, 1);
lept_stderr("Translation. same?: %d\n\n", same);
boxaDestroy(&boxa2);
numaDestroy(&nai2);
pixDestroy(&pixb2);
numaaDestroy(&naa2);
/* Aligned part is below h/3 */
pixb2 = pixCreateTemplate(pixb1);
pixGetDimensions(pixb1, &w, &h, NULL);
pixRasterop(pixb2, 0, 0, w, h / 3, PIX_SRC, pixb1, 0, 2 * h / 3);
pixRasterop(pixb2, 0, h / 3, w, 2 * h / 3, PIX_SRC, pixb1, 0, h / 3);
pixDisplay(pixb2, 900, 0);
pixGetWordBoxesInTextlines(pixb2, 10, 10, 500, 50, &boxa2, &nai2);
naa2 = boxaExtractSortedPattern(boxa2, nai2);
numaaCompareImagesByBoxes(naa1, naa2, 5, 10, 150, 150, 20, 20, &same, 1);
lept_stderr("Aligned part below h/3. same?: %d\n\n", same);
boxaDestroy(&boxa2);
numaDestroy(&nai2);
pixDestroy(&pixb2);
numaaDestroy(&naa2);
/* Top and bottom switched; no aligned parts */
pixb2 = pixCreateTemplate(pixb1);
pixGetDimensions(pixb1, &w, &h, NULL);
pixRasterop(pixb2, 0, 0, w, h / 3, PIX_SRC, pixb1, 0, 2 * h / 3);
pixRasterop(pixb2, 0, h / 3, w, 2 * h / 3, PIX_SRC, pixb1, 0, 0);
pixDisplay(pixb2, 1200, 0);
pixGetWordBoxesInTextlines(pixb2, 10, 10, 500, 50, &boxa2, &nai2);
naa2 = boxaExtractSortedPattern(boxa2, nai2);
numaaCompareImagesByBoxes(naa1, naa2, 5, 10, 150, 150, 20, 20, &same, 1);
lept_stderr("Top/Bot switched; no alignment. Same?: %d\n", same);
boxaDestroy(&boxa2);
numaDestroy(&nai2);
pixDestroy(&pixb2);
numaaDestroy(&naa2);
boxaDestroy(&boxa1);
numaDestroy(&nai1);
pixDestroy(&pixs);
pixDestroy(&pixb1);
pixDestroy(&pixt);
numaaDestroy(&naa1);
return 0;
}
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