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3
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1 #include "wm.h"
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2 #include "signature.h"
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3 #include "dwt.h"
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4 #include "pgm.h"
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5
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6 char *progname;
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7
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8 // inverse watermarking transformation, extract embedded bit, check quantization boundaries
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9 double wm_transform(int quant, double f1, double f2, double f3) {
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10 double s = (fabs(f3) - fabs(f1)) / (double) quant;
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11 double l = f1;
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12 int x;
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13
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14 x = 0;
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15 while (l < f2) {
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16 l += s;
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17 x++;
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18 }
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19
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20 if (fabs(l - s - f2) < fabs(l-f2))
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21 return (x+1) % 2;
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22 else
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23 return (x) % 2;
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24 }
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25
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26 void usage(void) {
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27 fprintf(stderr, "usage: %s [-a n] [-e n] [-f n] [-F n] [-h] [-l n] [-o file] [-v n] -s file file\n\n", progname);
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28 fprintf(stderr, "\t-a n\t\tembedding strength (default 0.05)\n");
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29 fprintf(stderr, "\t-e n\t\twavelet filtering method\n");
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30 fprintf(stderr, "\t-f n\t\tfilter number\n");
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31 fprintf(stderr, "\t-F file\t\tfilter definition file\n");
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32 fprintf(stderr, "\t-l n\t\tembedding level\n");
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33 fprintf(stderr, "\t-h\t\tprint usage\n");
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34 fprintf(stderr, "\t-o file\t\textracted signature file\n");
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35 fprintf(stderr, "\t-q n\t\tquantization level\n");
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36 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\n");
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37 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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38 exit(0);
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39 }
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40
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41 int main(int argc, char *argv[]) {
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42
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43 FILE *in = stdin;
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44 FILE *out = stdout;
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45 FILE *sig = NULL;
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46
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47 char output_name[MAXPATHLEN] = "(stdout)";
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48 char input_name[MAXPATHLEN] = "(stdin)";
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49 char signature_name[MAXPATHLEN];
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50
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51 int c, n;
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52 int row, col;
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53
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54 double alpha = 0.0;
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55 int quant = 0;
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56 int filter = 0;
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57 int method = -1;
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58 int level = 0;
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59 char filter_name[MAXPATHLEN] = "";
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60
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61 int seed;
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62 int verbose = 0;
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63
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64 gray **image;
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65 Image_tree dwts, p;
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66
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67 gray maxval;
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68 int rows, cols, colors, format;
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69
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70 progname = argv[0];
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71
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72 pgm_init(&argc, argv); wm_init2();
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73
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74 while ((c = getopt(argc, argv, "a:e:f:F:h?l:o:s:v:q:")) != EOF) {
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75 switch (c) {
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76 case 'e':
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77 method = atoi(optarg);
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78 if (method < 0) {
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79 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
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80 exit(1);
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81 }
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82 break;
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83 case 'f':
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84 filter = atoi(optarg);
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85 if (filter <= 0) {
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86 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
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87 exit(1);
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88 }
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89 break;
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90 case 'F':
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91 strcpy(filter_name, optarg);
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92 break;
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93 case 'h':
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94 case '?':
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95 usage();
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96 break;
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97 case 'l':
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98 level = atoi(optarg);
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99 if (level < 1) {
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100 fprintf(stderr, "%s: embedding level out of range\n", progname);
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101 exit(1);
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102 }
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103 break;
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104 case 'o':
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105 if ((out = fopen(optarg, "wb")) == NULL) {
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106 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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107 exit(1);
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108 }
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109 strcpy(output_name, optarg);
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110 break;
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111 case 'q':
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112 quant = atoi(optarg);
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113 break;
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114 case 'a':
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115 alpha = atof(optarg);
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116 if (alpha <= 0.0) {
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117 fprintf(stderr, "%s: embedding strength factor %f out of range\n", progname, alpha);
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118 exit(1);
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119 }
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120 break;
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121 case 's':
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122 if ((sig = fopen(optarg, "r")) == NULL) {
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123 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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124 exit(1);
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125 }
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126 strcpy(signature_name, optarg);
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127 break;
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128 case 'v':
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129 verbose = atoi(optarg);
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130 if (verbose < 0) {
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131 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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132 exit(1);
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133 }
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134 break;
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135 }
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136 }
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137
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138 argc -= optind;
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139 argv += optind;
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140
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141 if (argc > 1) {
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142 usage();
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143 exit(1);
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144 }
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145
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146 if (argc == 1 && *argv[0] != '-')
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147 if ((in = fopen(argv[0], "rb")) == NULL) {
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148 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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149 exit(1);
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150 }
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151 else
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152 strcpy(input_name, argv[0]);
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153
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154 if (sig) {
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155 char line[32];
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156 fgets(line, sizeof(line), sig);
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157 if (strspn(line, "XE2SG") >= 5) {
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158 fscanf(sig, "%d\n", &nbit_signature);
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159 if (alpha == 0.0)
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160 fscanf(sig, "%lf\n", &alpha);
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161 else
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162 fscanf(sig, "%*lf\n");
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163 if (method < 0)
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164 fscanf(sig, "%d\n", &method);
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165 else
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166 fscanf(sig, "%*d\n");
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167 if (filter == 0)
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168 fscanf(sig, "%d\n", &filter);
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169 else
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170 fscanf(sig, "%*d\n");
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171 if (!strcmp(filter_name, ""))
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172 fscanf(sig, "%[^\n\r]\n", &filter_name);
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173 else
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174 fscanf(sig, "%*[^\n\r]\n");
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175 if (quant == 0)
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176 fscanf(sig, "%d\n", &quant);
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177 else
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178 fscanf(sig, "%*d\n");
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179 if (level == 0)
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180 fscanf(sig, "%d\n", &level);
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181 else
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182 fscanf(sig, "%*d\n");
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183 fscanf(sig, "%d\n", &seed);
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184 srandom(seed);
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185 n_signature = NBITSTOBYTES(nbit_signature);
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186 fread(signature, sizeof(char), n_signature, sig);
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187 fscanf(sig, "\n");
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188 }
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189 else {
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190 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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191 exit(1);
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192 }
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193 fclose(sig);
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194 }
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195 else {
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196 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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197 exit(1);
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198 }
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199
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200 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
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201 if (verbose > 0)
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202 fprintf(stderr, "%s: embedding %d bits with strength %d in\n"
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203 " %d x %d host image, decomposition level %d\n",
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204 progname, nbit_signature, quant, cols, rows, level);
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205
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206 image = pgm_allocarray(cols, rows);
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207 for (row = 0; row < rows; row++)
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208 pgm_readpgmrow(in, image[row], cols, maxval, format);
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209 fclose(in);
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210
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211 // decomposition of image
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212 init_dwt(cols, rows, filter_name, filter, level, method);
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213 #ifdef POLLEN_STUFF
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214 #include "pollen_stuff.c"
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215 #endif
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216 #ifdef PARAM_STUFF
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217 #include "param_stuff.c"
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218 #endif
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219
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220 dwts = fdwt(image);
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221
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222 p = dwts;
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223
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224 // consider each resolution level
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225 while (p->level < level)
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226 // descend one level
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227 p = p->coarse;
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228
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229 // repeat binary watermark by sliding a 3-pixel window of approximation image
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230 n = 0;
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231 for (row = 0; row < p->image->height; row++) {
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232 col = 0;
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233 while (col < p->image->width - 3) {
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234 double b1, b2, b3;
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235 double *f1 = &b1, *f2 = &b2, *f3 = &b3;
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236
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237 // get all three approximation pixels in window
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238 b1 = get_pixel(p->image, col + 0, row);
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239 b2 = get_pixel(p->image, col + 1, row);
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240 b3 = get_pixel(p->image, col + 2, row);
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241
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242 // bring selected pixels in ascending order
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243 #define SWAP(A, B) {double *t = A; A = B; B = t;}
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244 if (*f1 > *f2) SWAP(f1, f2);
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245 if (*f2 > *f3) SWAP(f2, f3);
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246 if (*f1 > *f2) SWAP(f1, f2);
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247
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248 set_signature_bit(n, wm_transform(quant, *f1, *f2, *f3));
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249
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250 if (verbose > 1)
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251 fprintf(stderr, "%s: extracting #%d (= %d) at (%d/%d); %f < %f < %f\n",
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252 progname, n, get_signature_bit(n % nbit_signature), col, row, *f1, *f2, *f3);
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253
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254 n++;
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255 col += 3;
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256 col += (2.0 / alpha);
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257 }
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258 }
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259
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260 fprintf(out, "XE2WM\n");
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261 fprintf(out, "%d\n", n);
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262 fwrite(signature, sizeof(char), NBITSTOBYTES(n), out);
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263 fprintf(out, "\n");
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264 fclose(out);
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265
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266 pgm_freearray(image, rows);
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267
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268 exit(0);
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269 }
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