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| 1 // Copyright (c) 2008 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 /* Fuzzy pixel test matching. |
| 6 * |
| 7 * This is designed to compare two layout test images (RGB 800x600) and manage |
| 8 * to ignore the noise caused by the font renderers choosing slightly different |
| 9 * pixels. |
| 10 * |
| 11 * A B |
| 12 * | | |
| 13 * |--->delta<---| |
| 14 * | |
| 15 * V |
| 16 * gray |
| 17 * | |
| 18 * V |
| 19 * binary |
| 20 * | |
| 21 * |-------------| |
| 22 * | | |
| 23 * 1x3 3x1 Morphological openings |
| 24 * | | |
| 25 * |-----OR------| |
| 26 * | |
| 27 * V |
| 28 * count pixels |
| 29 * |
| 30 * The result is that three different pixels in a row (vertically or |
| 31 * horizontally) will cause the match to fail and the binary exits with code 1. |
| 32 * Otherwise the binary exists with code 0. |
| 33 * |
| 34 * This requires leptonica to be installed. On Ubuntu do |
| 35 * # apt-get install libleptonica libleptonica-dev |
| 36 * |
| 37 * Build with: |
| 38 * % gcc -o fuzzymatch fuzzymatch.c -llept -ljpeg -ltiff -lpng -lz -lm -Wall -
O2 |
| 39 */ |
| 40 |
| 41 #include <unistd.h> |
| 42 #include <stdio.h> |
| 43 #include <leptonica/allheaders.h> |
| 44 |
| 45 static int |
| 46 usage(const char *argv0) { |
| 47 fprintf(stderr, "Usage: %s <input a> <input b>\n", argv0); |
| 48 return 1; |
| 49 } |
| 50 |
| 51 int |
| 52 main(int argc, char **argv) { |
| 53 if (argc != 3) |
| 54 return usage(argv[0]); |
| 55 |
| 56 PIX *a = pixRead(argv[1]); |
| 57 PIX *b = pixRead(argv[2]); |
| 58 |
| 59 if (!a) { |
| 60 fprintf(stderr, "Failed to open %s\n", argv[1]); |
| 61 return 1; |
| 62 } |
| 63 |
| 64 if (!b) { |
| 65 fprintf(stderr, "Failed to open %s\n", argv[1]); |
| 66 return 1; |
| 67 } |
| 68 |
| 69 if (pixGetWidth(a) != pixGetWidth(b) || |
| 70 pixGetHeight(a) != pixGetHeight(b)) { |
| 71 fprintf(stderr, "Inputs are difference sizes\n"); |
| 72 return 1; |
| 73 } |
| 74 |
| 75 PIX *delta = pixAbsDifference(a, b); |
| 76 pixInvert(delta, delta); |
| 77 pixDestroy(&a); |
| 78 pixDestroy(&b); |
| 79 |
| 80 PIX *deltagray = pixConvertRGBToGray(delta, 0, 0, 0); |
| 81 pixDestroy(&delta); |
| 82 |
| 83 PIX *deltabinary = pixThresholdToBinary(deltagray, 254); |
| 84 |
| 85 PIX *hopened = pixOpenBrick(NULL, deltabinary, 3, 1); |
| 86 PIX *vopened = pixOpenBrick(NULL, deltabinary, 1, 3); |
| 87 pixDestroy(&deltabinary); |
| 88 |
| 89 PIX *opened = pixOr(NULL, hopened, vopened); |
| 90 pixDestroy(&hopened); |
| 91 pixDestroy(&vopened); |
| 92 |
| 93 l_int32 count; |
| 94 pixCountPixels(opened, &count, NULL); |
| 95 fprintf(stderr, "%d\n", count); |
| 96 |
| 97 return count; |
| 98 } |
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