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