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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.
*====================================================================*/
/*
* pixcompare.c
*
* Compares two images, using the absolute value of the
* difference between pixel (or component values, for RGB).
* If one has a colormap and the other doesn't, the colormap
* is removed before making the comparison.
*
* Here's an interesting observation. Take an image that has
* been jpeg compressed at a quality = 75. If you re-compress
* the image, what quality factor should be used to minimize
* the change? Answer: 75 (!)
*/
#include <stdio.h>
#include <stdlib.h>
#include "allheaders.h"
/* set one of these to 1 */
#define XOR 0
#define SUBTRACT_1_FROM_2 0
#define SUBTRACT_2_FROM_1 0
#define ABS_DIFFERENCE 1
main(int argc,
char **argv)
{
char *filein1, *filein2, *fileout;
l_int32 i, j, w, h, d1, d2, d, n, zero, first, last, same, wpld, wplt;
l_uint32 *datad, *datat, *lined, *linet;
NUMA *na, *na2;
PIX *pixs1, *pixs2, *pixt1, *pixt2, *pixd, *pixt;
PIXCMAP *cmap1, *cmap2;
static char mainName[] = "pixcompare";
if (argc != 4)
exit(ERROR_INT(" Syntax: pixcompare filein1 filein2 fileout",
mainName, 1));
filein1 = argv[1];
filein2 = argv[2];
fileout = argv[3];
if ((pixs1 = pixRead(filein1)) == NULL)
exit(ERROR_INT("pixs1 not made", mainName, 1));
if ((pixs2 = pixRead(filein2)) == NULL)
exit(ERROR_INT("pixs2 not made", mainName, 1));
d1 = pixGetDepth(pixs1);
d2 = pixGetDepth(pixs2);
if (d1 == 1 || d2 == 1)
exit(ERROR_INT("at least one pix is 1 bpp", mainName, 1));
w = pixGetWidth(pixs1);
if (w != pixGetWidth(pixs2))
exit(ERROR_INT("image widths differ", mainName, 1));
h = pixGetHeight(pixs1);
if (h != pixGetHeight(pixs2))
exit(ERROR_INT("image heights differ", mainName, 1));
pixEqual(pixs1, pixs2, &same);
if (same) {
fprintf(stderr, "Images are identical\n");
pixd = pixCreateTemplate(pixs1); /* empty "diff" result */
pixWrite(fileout, pixd, IFF_PNG);
pixDestroy(&pixs1);
pixDestroy(&pixs2);
pixDestroy(&pixd);
exit(0);
}
/* OK, they're different. We have to first remove any colormaps. */
cmap1 = pixGetColormap(pixs1);
cmap2 = pixGetColormap(pixs2);
if (cmap1) {
pixt1 = pixRemoveColormap(pixs1, REMOVE_CMAP_BASED_ON_SRC);
pixDestroy(&pixs1);
pixs1 = pixt1;
}
if (cmap2) {
pixt2 = pixRemoveColormap(pixs2, REMOVE_CMAP_BASED_ON_SRC);
pixDestroy(&pixs2);
pixs2 = pixt2;
}
/* compare depths without colormaps */
d = pixGetDepth(pixs1);
if (d != pixGetDepth(pixs2)) {
fprintf(stderr, "Intrinsic pix depths are different\n");
pixDestroy(&pixs1);
pixDestroy(&pixs2);
exit(0);
}
#if XOR
fprintf(stderr, "xor: 1 ^ 2\n");
pixRasterop(pixs1, 0, 0, w, h, PIX_SRC ^ PIX_DST, pixs2, 0, 0);
pixZero(pixs1, &zero);
if (zero)
fprintf(stderr, "Images are identical\n");
else
fprintf(stderr, "Images differ\n");
pixWrite(fileout, pixs1, IFF_PNG);
#elif SUBTRACT_1_FROM_2
fprintf(stderr, "subtract: 2 - 1\n");
pixRasterop(pixs1, 0, 0, w, h, PIX_SRC & PIX_NOT(PIX_DST), pixs2, 0, 0);
pixZero(pixs1, &zero);
if (zero)
fprintf(stderr, "Images are identical\n");
else
fprintf(stderr, "Images differ\n");
pixWrite(fileout, pixs1, IFF_PNG);
#elif SUBTRACT_2_FROM_1
fprintf(stderr, "subtract: 1 - 2\n");
pixRasterop(pixs1, 0, 0, w, h, PIX_DST & PIX_NOT(PIX_SRC), pixs2, 0, 0);
pixZero(pixs1, &zero);
if (zero)
fprintf(stderr, "Images are identical\n");
else
fprintf(stderr, "Images differ\n");
pixWrite(fileout, pixs1, IFF_PNG);
#else /* ABS_DIFFERENCE */
fprintf(stderr, "component-wise absdiff: 1 - 2\n");
pixd = pixAbsDifference(pixs1, pixs2);
if (d != 32) {
na = pixGetGrayHistogram(pixd, 1);
numaGetNonzeroRange(na, 0.00001, &first, &last);
na2 = numaClipToInterval(na, 0, last);
numaWriteStream(stderr, na2);
gplotSimple1(na2, GPLOT_X11, "junkroot", "diff histo");
numaDestroy(&na);
numaDestroy(&na2);
}
else { /* d == 32 */
NUMA *nar, *nag, *nab;
pixGetColorHistogram(pixd, 1, &nar, &nag, &nab);
numaGetNonzeroRange(nar, 0.00001, &first, &last);
na = numaClipToInterval(nar, 0, last);
gplotSimple1(na, GPLOT_X11, "junkrootred", "red diff histo");
numaDestroy(&na);
numaGetNonzeroRange(nag, 0.00001, &first, &last);
na = numaClipToInterval(nag, 0, last);
gplotSimple1(na, GPLOT_X11, "junkrootgreen", "green diff histo");
numaDestroy(&na);
numaGetNonzeroRange(nab, 0.00001, &first, &last);
na = numaClipToInterval(nab, 0, last);
gplotSimple1(na, GPLOT_X11, "junkrootblue", "blue diff histo");
numaDestroy(&na);
numaDestroy(&nar);
numaDestroy(&nag);
numaDestroy(&nab);
}
pixWrite(fileout, pixd, IFF_PNG);
pixGetDimensions(pixd, &w, &h, NULL);
pixt = pixCreate(w, h, 1);
datad = pixGetData(pixd);
datat = pixGetData(pixt);
wpld = pixGetWpl(pixd);
wplt = pixGetWpl(pixt);
for (i = 0; i < h; i++) {
lined = datad + i * wpld;
linet = datat + i * wplt;
for (j = 0; j < w; j++) {
if (GET_DATA_BYTE(lined, j))
SET_DATA_BIT(linet, j);
}
}
pixWrite("junkpixt", pixt, IFF_PNM);
pixDestroy(&pixt);
pixDestroy(&pixd);
#endif
pixDestroy(&pixs1);
pixDestroy(&pixs2);
exit(0);
}
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