1 | /* |
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2 | * java.c: decode java captchas I forgot about |
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3 | * $Id: decoder.c 2317 2008-04-26 08:41:35Z sam $ |
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4 | * |
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5 | * Copyright: (c) 2005 Sam Hocevar <sam@zoy.org> |
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6 | * This program is free software. It comes without any warranty, to |
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7 | * the extent permitted by applicable law. You can redistribute it |
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8 | * and/or modify it under the terms of the Do What The Fuck You Want |
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9 | * To Public License, Version 2, as published by Sam Hocevar. See |
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10 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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11 | */ |
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12 | |
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13 | #include <stdio.h> |
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14 | #include <stdlib.h> |
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15 | #include <string.h> |
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16 | #include <limits.h> |
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17 | |
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18 | #include "config.h" |
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19 | #include "common.h" |
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20 | |
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21 | /* Main function */ |
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22 | char *decode_java(struct image *img) |
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23 | { |
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24 | struct image *tmp; |
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25 | int x, y, dx, dy, best = 0, bestx, besty; |
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26 | int r, g, b, r2, g2, b2, r3, g3, b3, r4, g4, b4, i, j, c; |
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27 | |
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28 | tmp = image_dup(img); |
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29 | filter_threshold(tmp, 245); |
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30 | |
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31 | for(dy = 0; dy < 20; dy++) |
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32 | { |
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33 | if(dy > -5 && dy < 5) |
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34 | continue; |
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35 | |
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36 | for(dx = -20; dx < 20; dx++) |
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37 | { |
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38 | int good = 0; |
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39 | |
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40 | if(dx > -5 && dx < 5) |
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41 | continue; |
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42 | |
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43 | for(y = 0; y < tmp->height - dy; y++) |
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44 | { |
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45 | for(x = 0; x < tmp->width; x++) |
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46 | { |
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47 | getpixel(tmp, x, y, &r, &g, &b); |
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48 | getpixel(tmp, x + dx, y + dy, &r2, &g2, &b2); |
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49 | |
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50 | if(r && r2) |
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51 | good++; |
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52 | } |
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53 | } |
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54 | |
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55 | if(good > best) |
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56 | { |
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57 | best = good; |
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58 | bestx = dx; |
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59 | besty = dy; |
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60 | } |
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61 | } |
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62 | } |
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63 | |
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64 | for(y = 0; y < tmp->height - besty; y++) |
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65 | { |
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66 | for(x = 0; x < tmp->width; x++) |
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67 | { |
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68 | getpixel(tmp, x, y, &r, &g, &b); |
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69 | getpixel(tmp, x + bestx, y + besty, &r2, &g2, &b2); |
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70 | getpixel(tmp, x - bestx, y - besty, &r3, &g3, &b3); |
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71 | getpixel(tmp, x + 2 * bestx, y + 2 * besty, &r4, &g4, &b4); |
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72 | |
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73 | if(r && r2) |
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74 | { |
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75 | if(r3 && r4) |
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76 | setpixel(img, x, y, 0, 127, 0); |
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77 | else |
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78 | setpixel(img, x, y, 0, 255, 255); |
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79 | } |
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80 | else if(r) |
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81 | setpixel(img, x, y, 0, 0, 127); |
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82 | else |
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83 | setpixel(img, x, y, 0, 0, 0); |
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84 | } |
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85 | } |
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86 | |
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87 | image_save(img, "test.bmp"); |
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88 | image_free(tmp); |
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89 | |
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90 | return NULL; |
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91 | } |
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92 | |
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