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1 #include "wm.h"
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2 #include "signature.h"
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3 #include "coord.h"
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4 #include "gray.h"
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5 #include "sort.h"
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6 #include "bruyn_common.h"
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7 #include "pgm.h"
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8
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9 char *progname;
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10
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11 // prints out program's parameters
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12 void usage(void) {
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13 fprintf(stderr, "usage: %s [-b n] [-h] [-k] [-n n] [-o file] [-pP n] [-q n] [-tT n] [-v n] -s file file\n", progname);
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14 fprintf(stderr, "\t-b n\t\tblock size\n");
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15 fprintf(stderr, "\t-h\t\tprint usage\n");
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16 fprintf(stderr, "\t-k\t\tdisable block skipping\n");
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17 fprintf(stderr, "\t-n n\t\tnumber of signature bits to detect\n");
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18 fprintf(stderr, "\t-o file\t\textracted signature file\n");
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19 fprintf(stderr, "\t-p n\t\tpattern type for zone 1\n");
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20 fprintf(stderr, "\t-P n\t\tpattern type for zone 2\n");
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21 fprintf(stderr, "\t-q n\t\tsignature strength\n");
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22 fprintf(stderr, "\t-s file\t\tembedded signature\n");
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23 fprintf(stderr, "\t-t n\t\tthreshold for noise\n");
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24 fprintf(stderr, "\t-T n\t\tthreshold for slope\n");
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25 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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26 exit(0);
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27 }
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28
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29 int main(int argc, char *argv[]) {
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30 FILE *in = stdin;
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31 FILE *out = stdout;
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32 FILE *sig = NULL;
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33
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34 gray** image;
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35 gray **block;
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36 gray **zone;
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37 gray **category1, **category2;
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38 gray maxval;
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39 double *slope;
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40 int rows, cols, colors, format;
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41 int c;
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42 int i, j;
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43 int r;
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44 int n;
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45 int col, row;
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46 int bwidth, bheight;
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47 int n_block;
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48
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49 char signature_name[MAXPATHLEN];
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50 char input_name[MAXPATHLEN] = "(stdin)";
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51 char output_name[MAXPATHLEN] = "(stdout)";
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52
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53 double quality = 0.0;
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54 double threshold_noise = 0.0;
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55 double threshold_slope = 0.0;
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56 int pattern1 = 0;
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57 int pattern2 = 0;
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58 int blocksize = 0;
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59 int seed;
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60
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61 int verbose = 0;
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62 int skipping = 0;
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63
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64 struct coords *coords;
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65
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66 progname = argv[0];
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67
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68 pgm_init(&argc, argv); wm_init2();
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69
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70 // parse command line and set options
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71 while ((c = getopt(argc, argv, "b:h?n:o:p:P:q:s:t:T:v:k")) != EOF) {
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72 switch (c) {
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73 case 'h':
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74 case '?':
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75 usage();
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76 break;
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77 case 'k':
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78 skipping = 1;
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79 break;
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80 case 'n':
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81 nbit_signature = atoi(optarg);
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82 if (nbit_signature <= 0 || nbit_signature > NBITSIGNATURE) {
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83 fprintf(stderr, "%s: invalid signature length %d\n", progname, nbit_signature);
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84 exit(1);
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85 }
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86 break;
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87 case 'o':
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88 if ((out = fopen(optarg, "wb")) == NULL) {
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89 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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90 exit(1);
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91 }
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92 strcpy(output_name, optarg);
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93 break;
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94 case 'p':
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95 pattern1 = atoi(optarg);
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96 if (pattern1 <= 0 || pattern1 > NPATTERN) {
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97 fprintf(stderr, "%s: pattern type out of range\n", progname);
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98 exit(1);
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99 }
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100 break;
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101 case 'P':
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102 pattern2 = atoi(optarg);
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103 if (pattern2 <= 0 || pattern2 > 3) {
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104 fprintf(stderr, "%s: pattern type out of range\n", progname);
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105 exit(1);
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106 }
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107 break;
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108 case 'q':
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109 quality = atof(optarg);
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110 if (quality <= 0) {
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111 fprintf(stderr, "%s: quality factor %f out of range\n", progname, quality);
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112 }
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113 break;
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114 case 's':
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115 if ((sig = fopen(optarg, "r")) == NULL) {
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116 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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117 exit(1);
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118 }
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119 strcpy(signature_name, optarg);
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120 break;
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121 case 't':
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122 threshold_noise = atof(optarg);
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123 if (threshold_noise <= 0) {
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124 fprintf(stderr, "%s: noise threshold %f out of range\n", progname, threshold_noise);
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125 }
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126 break;
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127 case 'T':
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128 threshold_slope = atof(optarg);
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129 if (threshold_slope <= 0) {
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130 fprintf(stderr, "%s: slope threshold %f out of range\n", progname, threshold_slope);
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131 }
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132 break;
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133 case 'v':
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134 verbose = atoi(optarg);
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135 if (verbose < 0) {
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136 fprintf(stderr, "%s: verbosity level %d out of range\n",progname, verbose);
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137 exit(1);
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138 }
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139 break;
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140 }
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141 }
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142
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143 argc -= optind;
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144 argv += optind;
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145
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146 if (argc > 1) {
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147 usage();
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148 exit(1);
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149 }
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150
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151 // open input image file or read from stdin
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152 if (argc == 1 && *argv[0] != '-')
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153 if ((in = fopen(argv[0], "rb")) == NULL) {
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154 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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155 exit(1);
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156 }
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157 else
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158 strcpy(input_name, argv[0]);
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159
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160 // read signature file and set options
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161 // command line options override signature file options
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162 if (sig) {
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163 char line[128];
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164 fgets(line, sizeof(line), sig);
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165 if (strspn(line, "BRSG") >= 4) {
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166 if (nbit_signature == 0)
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167 fscanf(sig, "%d\n", &nbit_signature);
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168 else
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169 fscanf(sig, "%*d\n");
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170 if (skipping == 0)
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171 fscanf(sig, "%d\n", &skipping);
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172 else
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173 fscanf(sig, "%*d\n");
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174 if (pattern1 == 0)
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175 fscanf(sig, "%d\n", &pattern1);
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176 else
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177 fscanf(sig, "%*d\n");
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178 if (pattern2 == 0)
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179 fscanf(sig, "%d\n", &pattern2);
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180 else
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181 fscanf(sig, "%*d\n");
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182 if (quality == 0.0)
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183 fscanf(sig, "%lf\n", &quality);
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184 else
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185 fscanf(sig, "%*lf\n");
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186 if (threshold_noise == 0.0)
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187 fscanf(sig, "%lf\n", &threshold_noise);
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188 else
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189 fscanf(sig, "%*lf\n");
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190 if (threshold_slope == 0.0)
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191 fscanf(sig, "%lf\n", &threshold_slope);
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192 else
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193 fscanf(sig, "%*lf\n");
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194 if (blocksize == 0)
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195 fscanf(sig, "%d\n", &blocksize);
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196 else
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197 fscanf(sig, "%*d\n");
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198 fscanf(sig, "%d\n", &seed);
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199 srandom(seed);
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200 n_signature = NBITSTOBYTES(nbit_signature);
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201 fread(signature, sizeof(char), n_signature, sig);
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202 init_signature_bits();
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203 fscanf(sig, "\n");
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204 }
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205 else {
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206 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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207 exit(1);
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208 }
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209 fclose(sig);
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210 }
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211 else {
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212 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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213 exit(1);
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214 }
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215
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216 if (pattern1 <= 0 || pattern2 <= 0 || pattern1 > NPATTERN || pattern2 > NPATTERN) {
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217 fprintf(stderr, "%s: invalid pattern type specified\n");
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218 exit(1);
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219 }
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220
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221 // read dimensions of input image file
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222 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
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223
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224 // see if we can extract all signature bits
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225 // we want at least half of the blocks untouched
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226 if (((rows / blocksize) * (cols / blocksize)) < nbit_signature / 2) {
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227 fprintf(stderr, "%s: image not large enough to contain %d bits of signature\n", progname, nbit_signature);
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228 exit(1);
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229 }
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230 n_block = blocksize * blocksize;
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231
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232 // allocate structure to remember which blocks we already touched,
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233 // allow plenty of room to skip over blocks
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234 if ((coords = alloc_coords(nbit_signature * 2)) == NULL) {
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235 fprintf(stderr, "%s: unable to allocate memory\n", progname);
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236 exit(1);
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237 }
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238
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239 // read in input image file
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240 image = pgm_allocarray(cols, rows);
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241 for (row = 0; row < rows; row++)
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242 pgm_readpgmrow(in, image[row], cols, maxval, format);
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243
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244 fclose(in);
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245
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246 row = 0;
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247 col = 0;
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248
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249 // allocate memory for one block
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250 block = alloc_grays(blocksize, blocksize);
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251
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252 // allocate memory for zone classification
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253 zone = alloc_grays(blocksize, blocksize);
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254
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255 // allocate memory for category classification
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256 category1 = alloc_grays(blocksize, blocksize);
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257 category2 = alloc_grays(blocksize, blocksize);
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258
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259 // set up category classification array according to
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260 // pattern type parameter
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261 for (i = 0; i < blocksize; i++)
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262 for (j = 0; j < blocksize; j++) {
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263 category1[j][i] = lookup_pattern(pattern1, i, j);
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264 category2[j][i] = lookup_pattern(pattern2, i, j);
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265 }
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266
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267 // allocate memory for slope calculation
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268 slope = malloc(sizeof(double) * n_block);
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269
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270 fprintf(out, "BRWM\n");
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271 fprintf(out, "%d\n", nbit_signature);
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272
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273 // extract all the signature bits, one by one
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274 n = 0;
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275 while (n < nbit_signature) {
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276 int xb;
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277 int yb;
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278 int blocktype;
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279 double smax;
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280 int alpha, beta_minus, beta_plus;
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281 double mean_1A, mean_1B, mean_2A, mean_2B, mean_1, mean_2;
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282 double mean__1A, mean__1B, mean__2A, mean__2B;
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283 int n_1A, n_1B, n_2A, n_2B, n_1, n_2;
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284 double sigma, sigma_1, sigma_2;
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285 int zone1_ok, zone2_ok;
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286
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287 // find an unused block randomly, depending on seed
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288 do {
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289 xb = random() % (cols / blocksize);
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290 yb = random() % (rows / blocksize);
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291 } while (add_coord(coords, xb, yb) < 0);
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292
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293 // copy image block
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294 copy_grays_to_block(block, image, xb * blocksize, yb * blocksize, blocksize, blocksize);
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295
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296 if (verbose > 0)
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297 fprintf(stderr, "detecting bit #%d in block at (%d/%d)\n", n, xb * blocksize, yb * blocksize);
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298
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299 // sort luminance values in block to represent increasing function F
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300 sort_grays(block[0], n_block);
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301
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302 // calculate slopes of F and determine smax, the max. slope of F
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303 // the index where smax occures is called alpha
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304 alpha = 0;
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305 smax = 0.0;
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306 for (i = 0; i < n_block - 1; i++) {
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307 slope[i] = block[0][i + 1] - block[0][i];
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308 if (slope[i] > smax) {
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309 smax = slope[i];
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310 alpha = i;
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311 }
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312 }
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313 slope[n_block - 1] = 0;
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314
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315 // block type classification
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316 blocktype = BLOCKTYPE_UNKNOWN;
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317
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318 if (smax < threshold_noise) {
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319 // block has noise contrast
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320 beta_minus = beta_plus = alpha;
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321 blocktype = BLOCKTYPE_NOISE;
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322 }
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323 else {
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324 // block has progressive or hard contrast, let's find out...
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325
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326 beta_minus = alpha - 1;
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327 while (beta_minus >= 0 && smax - slope[beta_minus] <= threshold_slope)
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328 beta_minus--;
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329
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330 beta_plus = alpha + 1;
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331 while (beta_plus < n_block && smax - slope[beta_plus] <= threshold_slope)
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332 beta_plus++;
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333
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334 if (beta_minus + 1 == alpha && beta_plus - 1 == alpha)
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335 blocktype = BLOCKTYPE_HARD;
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336 else
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337 blocktype = BLOCKTYPE_PROGRESSIVE;
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338 }
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339
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340 if (verbose > 1) {
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341 fprintf(stderr, "blocktype: %d\n", blocktype);
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342 fprintf(stderr, "Smax = %lf, alpha = %d, beta- = %d, beta+ = %d\n", smax, alpha, beta_minus, beta_plus);
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343 }
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344
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345 // block pixel classification
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346 for (i = 0; i < blocksize; i++)
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347 for (j = 0; j < blocksize; j++) {
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348 gray pixel = image[yb * blocksize + j][xb * blocksize + i];
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349 zone[j][i] = ZONE_VOID;
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350 switch (blocktype) {
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351 case BLOCKTYPE_PROGRESSIVE:
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352 case BLOCKTYPE_HARD:
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353 if (pixel < block[0][beta_minus])
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354 zone[j][i] = ZONE_1;
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355 else if (pixel > block[0][beta_plus])
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356 zone[j][i] = ZONE_2;
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357 break;
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358 case BLOCKTYPE_NOISE:
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359 if (pixel < block[0][n_block / 2])
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360 zone[j][i] = ZONE_1;
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361 else if (pixel > block[0][n_block / 2])
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362 zone[j][i] = ZONE_2;
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363 break;
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364 default:
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365 fprintf(stderr, "%s: invalid block type\n", progname);
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366 break;
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367 }
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368 }
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369
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370 // calculate mean values for zone/categories
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371 mean_1A = mean_1B = mean_2A = mean_2B = mean_1 = mean_2 = 0.0;
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372 n_1A = n_1B = n_2A = n_2B = n_1 = n_2 = 0;
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373 for (i = 0; i < blocksize; i++)
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374 for (j = 0; j < blocksize; j++) {
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375 gray pixel = image[yb * blocksize + j][xb * blocksize + i];
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376 int pixel_zone = zone[j][i];
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377 int pixel_category = CATEGORY_VOID;
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378 if (pixel_zone == ZONE_1)
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379 pixel_category = category1[j][i];
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380 else if (pixel_zone == ZONE_2)
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381 pixel_category = category2[j][i];
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382
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383 switch (pixel_zone | pixel_category) {
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384 case CLASSIFICATION_1A:
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385 n_1++;
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386 n_1A++;
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387 mean_1A += pixel;
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388 mean_1 += pixel;
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389 break;
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390 case CLASSIFICATION_1B:
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391 n_1++;
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392 n_1B++;
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393 mean_1B += pixel;
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394 mean_1 += pixel;
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395 break;
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396 case CLASSIFICATION_2A:
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397 n_2++;
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398 n_2A++;
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399 mean_2A += pixel;
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400 mean_2 += pixel;
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401 break;
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402 case CLASSIFICATION_2B:
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403 n_2++;
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404 n_2B++;
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405 mean_2B += pixel;
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406 mean_2 += pixel;
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407 break;
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408 }
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409 }
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410
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411 if (n_1 && n_1A && n_1B) {
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412 mean_1 /= (double) n_1;
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413 mean_1A /= (double) n_1A;
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414 mean_1B /= (double) n_1B;
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415 zone1_ok = 1;
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416 }
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417 else {
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418 mean_1 = mean_1A = mean_1B = 0.0;
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419 zone1_ok = 0;
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420 if (verbose > 0)
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421 fprintf(stderr, "zone 1 unusable\n");
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422 }
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423
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424 if (n_2 && n_2A && n_2B) {
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425 mean_2 /= (double) n_2;
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426 mean_2A /= (double) n_2A;
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427 mean_2B /= (double) n_2B;
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428 zone2_ok = 1;
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429 }
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430 else {
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431 mean_2 = mean_2A = mean_2B = 0.0;
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432 zone2_ok = 0;
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433 if (verbose > 0)
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434 fprintf(stderr, "zone 2 unusable\n");
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435 }
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436
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437 // bit extraction
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438 if (zone1_ok && zone2_ok) {
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439 sigma_1 = mean_1A - mean_1B;
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440 sigma_2 = mean_2A - mean_2B;
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441
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|
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442 if (verbose > 2) {
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443 fprintf(stderr, "m_1A = %lf, m_1B = %lf\n", mean_1A, mean_1B);
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444 fprintf(stderr, "m_2A = %lf, m_2B = %lf\n", mean_2A, mean_2B);
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|
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445 fprintf(stderr, "sigma1 = %lf, sigma2 = %lf\n", sigma_1, sigma_2);
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|
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446 }
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|
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447
|
|
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448 #define EPSILON 0.001
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|
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449 if (fabs(sigma_1 * sigma_2) < EPSILON) {
|
|
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450 // case 3
|
|
|
451 sigma = MAX(fabs(sigma_1), fabs(sigma_2));
|
|
|
452 set_signature_bit(n, sigma > 0.0);
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|
|
453 if (verbose > 0)
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|
|
454 fprintf(stderr, "case 3, bit #%d = %d\n", n, sigma > 0.0);
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|
|
455 }
|
|
|
456 else if (sigma_1 * sigma_2 > 0.0) {
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|
|
457 // case 1
|
|
|
458 set_signature_bit(n, sigma_1 > 0.0);
|
|
|
459 if (verbose > 0)
|
|
|
460 fprintf(stderr, "case 1, bit #%d = %d\n", n, sigma_1 > 0.0);
|
|
|
461 }
|
|
|
462 else if (sigma_1 * sigma_2 < 0.0) {
|
|
|
463 // case 2
|
|
|
464 sigma = (double) (n_1A + n_1B) * sigma_1 + (double) (n_2A + n_2B) * sigma_2;
|
|
|
465 set_signature_bit(n, sigma > 0.0);
|
|
|
466 if (verbose > 0)
|
|
|
467 fprintf(stderr, "case 2, bit #%d = %d\n", n, sigma > 0.0);
|
|
|
468 }
|
|
|
469 }
|
|
|
470 else if (zone1_ok) {
|
|
|
471 set_signature_bit(n, mean_1A > mean_1B);
|
|
|
472 if (verbose > 0)
|
|
|
473 fprintf(stderr, "case 4, bit #%d = %d\n", n, mean_1A > mean_1B);
|
|
|
474 }
|
|
|
475 else if (zone2_ok) {
|
|
|
476 set_signature_bit(n, mean_2A > mean_2B);
|
|
|
477 if (verbose > 0)
|
|
|
478 fprintf(stderr, "case 5, bit #%d = %d\n", n, mean_2A > mean_2B);
|
|
|
479 }
|
|
|
480 else {
|
|
|
481 // pathological case - can it ever happen?
|
|
|
482 if (verbose > 0)
|
|
|
483 fprintf(stderr, "block skipped\n");
|
|
|
484 if (!skipping) continue;
|
|
|
485 }
|
|
|
486
|
|
|
487 n++;
|
|
|
488 }
|
|
|
489
|
|
|
490 free_grays(category2);
|
|
|
491 free_grays(category1);
|
|
|
492 free_grays(zone);
|
|
|
493 free_grays(block);
|
|
|
494
|
|
|
495 // write extracted signature
|
|
|
496
|
|
|
497 fwrite(signature, sizeof(char), n_signature, out);
|
|
|
498 fclose(out);
|
|
|
499
|
|
|
500 pgm_freearray(image, rows);
|
|
|
501
|
|
|
502 exit(0);
|
|
|
503 }
|
