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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] [-g n] [-n n] [-h] [-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-g n\t\tgamma factor med freq. embedding strength\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\toutput (watermarked) file\n");
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16 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\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
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23 FILE *in = stdin;
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24 FILE *out = stdout;
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25 FILE *sig = NULL;
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26
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27 char output_name[MAXPATHLEN] = "(stdout)";
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28 char input_name[MAXPATHLEN] = "(stdin)";
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29 char signature_name[MAXPATHLEN];
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30
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31 int c;
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32 int row, col;
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33 int n;
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34 double normalization = 1024.0;
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35 int seed, format;
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36
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37 double alpha = 0.0;
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38 double gamma = 0.0;
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39
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40 gray **image;
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41 double **coeffs;
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42
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43 double mean, derivation;
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44 double mult_factor;
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45
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46 int rows, cols;
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47 int verbose = 0;
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48 gray maxval;
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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_init();
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53
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54 while ((c = getopt(argc, argv, "a:g:n:h?o:s: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 'g':
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64 gamma = atof(optarg);
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65 if (gamma <= 0.0) {
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66 fprintf(stderr, "%s: gamma factor %f out of range\n", progname, alpha);
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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_signature);
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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 if (gamma == 0.0)
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131 fscanf(sig, "%lf\n", &gamma);
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132 else
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133 fscanf(sig, "%*lf\n");
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134
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135 fscanf(sig, "%d\n", &seed);
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136 n_signature = NBITSTOBYTES(nbit_signature);
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137 fread(signature, sizeof(char), n_signature, sig);
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138 fscanf(sig, "\n");
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139 srandom(seed);
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140 }
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141 else {
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142 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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143 exit(1);
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144 }
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145 fclose(sig);
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146 }
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147 else {
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148 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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149 exit(1);
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150 }
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151
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152 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
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153
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154 if (rows == cols)
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155 init_dct_NxN(cols, rows);
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156 else
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157 init_dct_NxM(cols, rows);
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158
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159 image = pgm_allocarray(cols, rows);
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160 for (row = 0; row < rows; row++)
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161 pgm_readpgmrow(in, image[row], cols, maxval, format);
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162 fclose(in);
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163
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164 // calculate mean value
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165 mean = 0.0;
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166 for (row = 0; row < rows; row++)
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167 for (col = 0; col < cols; col++)
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168 mean += image[row][col];
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169
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170 mean /= cols * rows;
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171
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172 // calculate derivation
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173 derivation = 0.0;
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174 for (row = 0; row < rows; row++)
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175 for (col = 0; col < cols; col++)
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176 derivation += sqr(image[row][col] - mean);
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177
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178 derivation = sqrt(derivation / (cols * rows - 1));
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179 mult_factor = normalization / (sqrt(cols * rows) * derivation);
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180
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181 if (verbose > 5)
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182 fprintf(stderr, "%s: mean %f, derivation %f, mult_factor %f\n", progname, mean, derivation, mult_factor);
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183
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184 // normalize image
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185 coeffs = alloc_coeffs(cols, rows);
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186 for (row = 0; row < rows; row++)
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187 for (col = 0; col < cols; col++)
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188 coeffs[row][col] = (image[row][col] - mean) * mult_factor;
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189
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190 if (cols == rows)
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191 fdct_inplace_NxN(coeffs);
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192 // else
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193 // fdct_NxM(image, dcts);
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194
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195 embed_low_freq(coeffs, cols, rows, alpha, verbose);
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196 embed_med_freq(coeffs, cols, rows, gamma, seed, verbose);
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197
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198 if (cols == rows)
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199 idct_inplace_NxN(coeffs);
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200 // else
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201 // idct_NxM(dcts, image);
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202
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203 for (row = 0; row < rows; row++)
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204 for (col = 0; col < cols; col++)
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205 image[row][col] = PIXELRANGE(coeffs[row][col] / mult_factor + mean + 0.5);
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206
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207 free_coeffs(coeffs);
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208
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209 pgm_writepgminit(out, cols, rows, maxval, 0);
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210 for (row = 0; row < rows; row++)
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211 pgm_writepgmrow(out, image[row], cols, maxval, 0);
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212
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213 fclose(out);
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214
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215 pgm_freearray(image, rows);
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216
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217 exit(0);
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218 }
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