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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 void usage(void) {
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9 fprintf(stderr, "usage: %s [-e n] [-f n] [-F n] [-h] [-l n] [-o file] [-q n] [-s file] [-v n] file\n\n", progname);
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10 fprintf(stderr, "\t-e n\t\twavelet filtering method\n");
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11 fprintf(stderr, "\t-f n\t\tfilter number\n");
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12 fprintf(stderr, "\t-F file\t\tfilter definition file\n");
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13 fprintf(stderr, "\t-h\t\tprint usage\n");
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14 fprintf(stderr, "\t-l n\t\tembedding level\n");
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15 fprintf(stderr, "\t-o file\t\textracted signature file\n");
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16 fprintf(stderr, "\t-q n\t\tsignature strength\n");
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17 fprintf(stderr, "\t-s file\t\toriginal signature file\n");
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18 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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19 exit(0);
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20 }
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21
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22 int main(int argc, char *argv[]) {
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23
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24 FILE *in = stdin;
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25 FILE *out = stdout;
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26 FILE *sig = NULL;
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27
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28 gray **input_image;
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29
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30 char signature_name[MAXPATHLEN];
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31 char output_name[MAXPATHLEN] = "(stdout)";
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32 char input_name[MAXPATHLEN] = "(stdin)";
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33
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34 int r, c;
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35 int quality = 0;
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36 int seed = 0;
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37 int n = 0;
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38 int method = -1;
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39 int filter = 0;
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40 char filter_name[MAXPATHLEN] = "";
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41
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42 char *binstr;
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43
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44 int level = 0;
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45
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46 int in_rows, in_cols, in_format;
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47 gray in_maxval;
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48 int rows, cols;
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49 int row, col;
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50
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51 Image_tree dwts, p;
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52
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53 int verbose = 0;
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54
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55 progname = argv[0];
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56
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57 pgm_init(&argc, argv);
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58 wm_init();
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59
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60 while ((c = getopt(argc, argv, "e:f:F:h?l:o:q:s:v:")) != EOF) {
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61 switch (c) {
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62 case 'e':
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63 method = atoi(optarg);
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64 if (method < 0) {
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65 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
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66 exit(1);
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67 }
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68 break;
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69 case 'f':
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70 filter = atoi(optarg);
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71 if (filter <= 0) {
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72 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
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73 exit(1);
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74 }
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75 break;
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76 case 'F':
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77 strcpy(filter_name, optarg);
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78 break;
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79 case 'h':
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80 case '?':
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81 usage();
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82 break;
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83 case 'l':
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84 level = atoi(optarg);
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85 if (level < 1) {
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86 fprintf(stderr, "%s: embedding level out of range\n", progname);
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87 exit(1);
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88 }
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89 break;
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90 case 'o':
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91 if ((out = fopen(optarg, "w")) == NULL) {
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92 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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93 exit(1);
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94 }
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95 strcpy(output_name, optarg);
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96 break;
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97 case 'q':
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98 quality = atoi(optarg);
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99 if (quality < 1) {
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100 fprintf(stderr, "%s: quality level %d out of range\n", progname, quality);
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101 exit(1);
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102 }
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103 break;
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104 case 's':
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105 if ((sig = fopen(optarg, "r")) == NULL) {
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106 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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107 exit(1);
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108 }
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109 strcpy(signature_name, optarg);
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110 break;
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111 case 'v':
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112 verbose = atoi(optarg);
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113 if (verbose < 0) {
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114 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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115 exit(1);
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116 }
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117 break;
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118 }
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119 }
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120
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121 argc -= optind;
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122 argv += optind;
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123
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124 if (argc > 1) {
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125 usage();
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126 exit(1);
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127 }
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128
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8
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129 if (argc == 1 && *argv[0] != '-') {
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3
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130 if ((in = fopen(argv[0], "rb")) == NULL) {
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131 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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132 exit(1);
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133 }
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134 else
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135 strcpy(input_name, argv[0]);
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8
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136 }
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137
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3
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138 if (sig) {
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139 char line[32];
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140 fgets(line, sizeof(line), sig);
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141 if (strspn(line, "KD3SG") >= 5) {
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142 fscanf(sig, "%d\n", &nbit_signature);
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143 if (quality == 0)
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144 fscanf(sig, "%d\n", &quality);
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145 else
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146 fscanf(sig, "%*d\n");
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147 if (method < 0)
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148 fscanf(sig, "%d\n", &method);
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149 else
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150 fscanf(sig, "%*d\n");
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151 if (filter == 0)
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152 fscanf(sig, "%d\n", &filter);
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153 else
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154 fscanf(sig, "%*d\n");
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155 if (!strcmp(filter_name, ""))
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156 fscanf(sig, "%[^\n\r]\n", &filter_name);
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157 else
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158 fscanf(sig, "%*[^\n\r]\n");
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159 if (level == 0)
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160 fscanf(sig, "%d\n", &level);
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161 else
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162 fscanf(sig, "%*d\n");
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163 fscanf(sig, "%d\n", &seed);
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164 srandom(seed);
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165 nbit_signature2 = nbit_signature;
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166 n_signature = n_signature2 = NBITSTOBYTES(nbit_signature2);
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167 binstr = malloc((nbit_signature2 + 1) * sizeof(char));
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168 fscanf(sig, "%[01]\n", binstr);
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169 binstr_to_sig2(binstr);
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170 free(binstr);
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171 init_signature_bits();
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172 }
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173 else {
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174 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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175 exit(1);
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176 }
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177 fclose(sig);
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178 }
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179 else {
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180 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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181 exit(1);
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182 }
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183
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184 pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
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185
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186 cols = in_cols;
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187 rows = in_rows;
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188
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189 if (verbose > 0)
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190 fprintf(stderr, "%s: extracting %d bits with quality %d from\n"
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191 " %d x %d host image, decomposition level %d\n",
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192 progname, nbit_signature, quality, cols, rows, level);
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193
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194 input_image = pgm_allocarray(in_cols, in_rows);
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195
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196 for (row = 0; row < in_rows; row++)
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197 pgm_readpgmrow(in, input_image[row], in_cols, in_maxval, in_format);
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198
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199 fclose(in);
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200
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201 init_dwt(cols, rows, filter_name, filter, level, method);
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202 /*#ifdef POLLEN_STUFF
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203 #include "pollen_stuff.c"
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204 #endif
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205 #ifdef PARAM_STUFF
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206 #include "param_stuff.c"
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207 #endif*/
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208
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209 dwts = fdwt(input_image);
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210
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211 p = dwts;
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212
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213 #define STEP 3
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214
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215 // consider each resolution level
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216 while (p->coarse->level < level)
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217 // descend one level
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218 p = p->coarse;
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219
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220 // start to extracting watermark from beginning at each level
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221 {
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222 // get width and height of detail images at current level
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223 int lwidth = p->vertical->image->width;
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224 int lheight = p->vertical->image->height;
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225
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226 if (verbose > 1)
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227 fprintf(stderr, "%s: extracting at level %d now, size %d x %d\n",
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228 progname, p->coarse->level, lwidth, lheight);
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229
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230 // consider each coefficient at resolution level
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231 for (row = 0; row < lwidth - STEP; row += STEP)
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232 for (col = 0; col < lheight - STEP; col += STEP) {
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233 double h, v, d;
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234 double *f1 = &h, *f2 = &v, *f3 = &d;
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235 double delta;
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236
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237 // key-dependant coefficient selection
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238 r = row + 1 + random() % (STEP-2);
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239 c = col + 1 + random() % (STEP-2);
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240
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241 // get coefficient values, one from each detail image
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242 h = get_pixel(p->horizontal->image, c, r);
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243 v = get_pixel(p->vertical->image, c, r);
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244 d = get_pixel(p->diagonal->image, c, r);
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245
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246 // order pointer to coefficient values such that f1 <= f2 <= f3
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247 #define SWAP(A, B) {double *t = A; A = B; B = t;}
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248 if (*f1 > *f2) SWAP(f1, f2);
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249 if (*f2 > *f3) SWAP(f2, f3);
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250 if (*f1 > *f2) SWAP(f1, f2);
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251
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252 // calculate delta, the width of the bins
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253 delta = (*f3 - *f1) / (double) (2 * quality - 1);
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254
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255 // set middle coefficient to closest appropriate bin,
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256 // according to watermark bit
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257 if (quality == 1)
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258 set_signature_bit(n, (*f3 - *f2) < (*f2 - *f1));
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259 else {
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260 double l = *f1;
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261 int i = 0;
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262 while ((l + delta) < *f2) {
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263 l += delta;
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264 i++;
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265 }
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266 if (i % 2)
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267 set_signature_bit(n, (l + delta - *f2) > (*f2 - l));
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268 else
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269 set_signature_bit(n, (l + delta - *f2) < (*f2 - l));
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270 }
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271
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272 if (verbose > 2)
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273 fprintf(stderr, "%s: extracted bit #%d (= %d =? %d) at (%d/%d),\n"
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274 " f1=%lf, f2=%lf, f3=%lf\n", progname, n,
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275 get_signature_bit(n), get_signature2_bit(n),
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276 c, r, *f1, *f2, *f3);
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277 n++;
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278 }
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279 }
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280
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281 fprintf(out, "KD3WM\n");
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282 fprintf(out, "%d\n", n);
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283 nbit_signature = n;
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284 binstr = malloc(sizeof(char) * (nbit_signature + 1));
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285 sig_to_binstr(binstr);
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286 fprintf(out, "%s\n", binstr);
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287 free(binstr);
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288 fclose(out);
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289
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290 pgm_freearray(input_image, rows);
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291
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292 exit(0);
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293 }
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