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1 #include "wm.h"
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2 #include "dct.h"
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3 #include "pgm.h"
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4 #include "signature.h"
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5 #include "frid2_common.h"
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6
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7 char *progname;
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8
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9 void usage(void) {
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10 fprintf(stderr, "usage: %s [-a n] [-h] [-b n] [-n n] [-o file] [-v n] -s file file\n\n", progname);
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11 fprintf(stderr, "\t-a n\t\talpha factor low freq. embedding strength\n");
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12 fprintf(stderr, "\t-b n\t\tbeta factor for weighted correlation (default 0)\n");
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13 fprintf(stderr, "\t-h\t\tprint usage\n");
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14 fprintf(stderr, "\t-n n\t\tnormalisation factor (default 1024.0)\n");
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15 fprintf(stderr, "\t-o file\t\tfile for extracted watermark information\n");
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16 fprintf(stderr, "\t-s file\t\toriginal signature file\n");
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17 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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18 exit(0);
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19 }
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20
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21 int main(int argc, char *argv[]) {
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22 FILE *in = stdin;
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23 FILE *out = stdout;
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24 FILE *sig = NULL;
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25
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26 char output_name[MAXPATHLEN] = "(stdout)";
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27 char input_name[MAXPATHLEN] = "(stdin)";
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28 char signature_name[MAXPATHLEN];
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29
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30 int c;
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31 int row, col;
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32 int n;
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33 double normalization = 1024.0;
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34 int seed, format;
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35
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36 double alpha = 0.0;
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37 double beta = 0.0;
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38
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39 double correlation;
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40
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41 gray **image;
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42 double **coeffs;
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43
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44 double mean, derivation, mult_factor;
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45 int rows, cols;
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46
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47 gray maxval;
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48 int verbose = 0;
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49
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50 progname = argv[0];
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51
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52 pgm_init(&argc, argv); wm_init2();
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53
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54 while ((c = getopt(argc, argv, "a:b:n:h?s:o:v:")) != EOF) {
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55 switch (c) {
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56 case 'a':
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57 alpha = atof(optarg);
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58 if (alpha <= 0.0) {
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59 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha);
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60 exit(1);
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61 }
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62 break;
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63 case 'b':
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64 beta = atof(optarg);
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65 if (beta <= 0.0) {
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66 fprintf(stderr, "%s: beta factor %f out of range\n", progname, beta);
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67 exit(1);
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68 }
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69 break;
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70 case 'n':
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71 normalization = atof(optarg);
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72 if (normalization < 0) {
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73 fprintf(stderr, "%s: normalisation factor %f out of range\n", progname, normalization);
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74 exit(1);
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75 }
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76 break;
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77 case 'h':
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78 case '?':
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79 usage();
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80 break;
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81 case 'o':
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82 if ((out = fopen(optarg, "wb")) == NULL) {
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83 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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84 exit(1);
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85 }
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86 strcpy(output_name, optarg);
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87 break;
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88 case 's':
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89 if ((sig = fopen(optarg, "r")) == NULL) {
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90 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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91 exit(1);
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92 }
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93 strcpy(signature_name, optarg);
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94 break;
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95 case 'v':
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96 verbose = atoi(optarg);
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97 if (verbose < 0) {
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98 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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99 exit(1);
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100 }
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101 break;
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102 }
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103 }
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104
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105 argc -= optind;
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106 argv += optind;
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107
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108 if (argc > 1) {
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109 usage();
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110 exit(1);
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111 }
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112
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113 if (argc == 1 && *argv[0] != '-')
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114 if ((in = fopen(argv[0], "rb")) == NULL) {
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115 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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116 exit(1);
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117 }
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118 else
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119 strcpy(input_name, argv[0]);
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120
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121 if (sig) {
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122 char line[32];
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123 fgets(line, sizeof(line), sig);
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124 if (strspn(line, "FR2SG") >= 5) {
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125 fscanf(sig, "%d\n", &nbit_signature1);
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126 if (alpha == 0.0)
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127 fscanf(sig, "%lf\n", &alpha);
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128 else
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129 fscanf(sig, "%*lf\n");
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130 fscanf(sig, "%*lf\n");
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131 fscanf(sig, "%d\n", &seed);
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132 n_signature1 = NBITSTOBYTES(nbit_signature1);
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133 fread(signature1, sizeof(char), n_signature1, sig);
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134 fscanf(sig, "\n");
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135 srandom(seed);
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136 }
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137 else {
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138 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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139 exit(1);
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140 }
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141 fclose(sig);
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142 }
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143 else {
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144 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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145 exit(1);
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146 }
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147
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148 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
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149 image = pgm_allocarray(cols, rows);
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150 for (row = 0; row < rows; row++)
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151 pgm_readpgmrow(in, image[row], cols, maxval, format);
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152 fclose(in);
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153
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154 // calculate mean malue
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155 mean = 0.0;
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156 for (row = 0; row < rows; row++)
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157 for (col = 0; col < cols; col++)
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158 mean += image[row][col];
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159
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160 mean /= cols * rows;
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161
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162 // calculate derivation
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163 derivation = 0.0;
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164 for (row = 0; row < rows; row++)
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165 for (col = 0; col < cols; col++)
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166 derivation += sqr(image[row][col] - mean);
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167
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168 derivation = sqrt(derivation / (cols * rows - 1));
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169 mult_factor = normalization / (sqrt(cols * rows) * derivation);
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170
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171 if (verbose > 5)
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172 fprintf(stderr, "%s: mean %f, derivation %f, mult_factor %f\n", progname, mean, derivation, mult_factor);
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173
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174 // normalize image
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175 coeffs = alloc_coeffs(cols, rows);
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176 for (row = 0; row < rows; row++)
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177 for (col = 0; col < cols; col++)
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178 coeffs[row][col] = (image[row][col] - mean) * mult_factor;
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179
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180 if (rows == cols) {
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181 init_dct_NxN(cols, rows);
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182 fdct_inplace_NxN(coeffs);
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183 }
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184 // else {
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185 // init_dct_NxM(cols, rows);
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186 // fdct_NxM(coeffs);
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187 // }
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188
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189
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190 fprintf(out, "FR2WM\n");
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191
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192 fprintf(out, "%d\n", nbit_signature1);
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193 correlation = detect_low_freq(coeffs, cols, rows, alpha, beta, verbose);
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194 if (verbose > 2)
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195 fprintf(stderr, "low_freq correlation: %f\n", correlation);
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196 fwrite(signature2, sizeof(char), NBITSTOBYTES(nbit_signature1), out);
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197 fprintf(out, "\n");
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198
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199 fprintf(out, "%d\n", nbit_signature1);
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200 correlation = detect_med_freq(coeffs, cols, rows, seed, verbose);
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201 if (verbose > 2)
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202 fprintf(stderr, "med_freq correlation: %f\n", correlation);
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203 fwrite(signature2, sizeof(char), NBITSTOBYTES(nbit_signature1), out);
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204 fprintf(out, "\n");
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205
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206 fclose(out);
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207
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208 free_coeffs(coeffs);
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209 pgm_freearray(image, rows);
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210
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211 exit(0);
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212 }
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