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// Copyright (c) 2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/* Fuzzy pixel test matching.
*
* This is designed to compare two layout test images (RGB 800x600) and manage
* to ignore the noise caused by the font renderers choosing slightly different
* pixels.
*
* A B
* | |
* |--->delta<---|
* |
* V
* gray
* |
* V
* binary
* |
* |-------------|
* | |
* 1x3 3x1 Morphological openings
* | |
* |-----OR------|
* |
* V
* count pixels
*
* The result is that three different pixels in a row (vertically or
* horizontally) will cause the match to fail and the binary exits with code 1.
* Otherwise the binary exists with code 0.
*
* This requires leptonica to be installed. On Ubuntu do
* # apt-get install libleptonica libleptonica-dev
*
* Build with:
* % gcc -o fuzzymatch fuzzymatch.c -llept -ljpeg -ltiff -lpng -lz -lm -Wall -O2
*/
#include <unistd.h>
#include <stdio.h>
#include <leptonica/allheaders.h>
static int
usage(const char *argv0) {
fprintf(stderr, "Usage: %s <input a> <input b>\n", argv0);
return 1;
}
int
main(int argc, char **argv) {
if (argc != 3)
return usage(argv[0]);
PIX *a = pixRead(argv[1]);
PIX *b = pixRead(argv[2]);
if (!a) {
fprintf(stderr, "Failed to open %s\n", argv[1]);
return 1;
}
if (!b) {
fprintf(stderr, "Failed to open %s\n", argv[1]);
return 1;
}
if (pixGetWidth(a) != pixGetWidth(b) ||
pixGetHeight(a) != pixGetHeight(b)) {
fprintf(stderr, "Inputs are difference sizes\n");
return 1;
}
PIX *delta = pixAbsDifference(a, b);
pixInvert(delta, delta);
pixDestroy(&a);
pixDestroy(&b);
PIX *deltagray = pixConvertRGBToGray(delta, 0, 0, 0);
pixDestroy(&delta);
PIX *deltabinary = pixThresholdToBinary(deltagray, 254);
PIX *hopened = pixOpenBrick(NULL, deltabinary, 3, 1);
PIX *vopened = pixOpenBrick(NULL, deltabinary, 1, 3);
pixDestroy(&deltabinary);
PIX *opened = pixOr(NULL, hopened, vopened);
pixDestroy(&hopened);
pixDestroy(&vopened);
l_int32 count;
pixCountPixels(opened, &count, NULL);
fprintf(stderr, "%d\n", count);
return count;
}
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