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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] [-v n] -s file 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-l n\t\tembedding level\n");
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14 fprintf(stderr, "\t-h\t\tprint usage\n");
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15 fprintf(stderr, "\t-o file\t\toutput (watermarked) file\n");
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16 fprintf(stderr, "\t-q n\t\tsignature strength (default 4)\n");
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17 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\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 char output_name[MAXPATHLEN] = "(stdout)";
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29 char input_name[MAXPATHLEN] = "(stdin)";
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30 char signature_name[MAXPATHLEN];
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31
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32 char *binstr;
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33
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34 int r, c, n;
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35 int row, col;
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36
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37 int quality = 0;
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38
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39 int filter = 0;
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40 int method = -1;
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41 int level = 0;
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42 char filter_name[MAXPATHLEN] = "";
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43
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44 int seed;
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45 int verbose = 0;
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46
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47 gray **image;
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48 Image_tree dwts, p;
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49
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50 gray maxval;
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8
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51 int rows, cols, format;
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3
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52
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53 progname = argv[0];
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54
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55 pgm_init(&argc, argv);
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56 wm_init();
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57
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58 while ((c = getopt(argc, argv, "e:f:F:h?l:o:q:s:v:")) != EOF) {
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59 switch (c) {
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60 case 'e':
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61 method = atoi(optarg);
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62 if (method < 0) {
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63 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
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64 exit(1);
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65 }
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66 break;
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67 case 'f':
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68 filter = atoi(optarg);
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69 if (filter <= 0) {
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70 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
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71 exit(1);
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72 }
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73 break;
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74 case 'F':
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75 strcpy(filter_name, optarg);
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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 'l':
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82 level = atoi(optarg);
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83 if (level < 1) {
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84 fprintf(stderr, "%s: embedding level out of range\n", progname);
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85 exit(1);
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86 }
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87 break;
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88 case 'o':
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89 if ((out = fopen(optarg, "wb")) == NULL) {
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90 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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91 exit(1);
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92 }
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93 strcpy(output_name, optarg);
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94 break;
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95 case 'q':
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96 quality = atoi(optarg);
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97 if (quality < 1) {
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98 fprintf(stderr, "%s: quality factor %d out of range\n", progname, quality);
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99 exit(1);
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100 }
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101 break;
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102 case 's':
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103 if ((sig = fopen(optarg, "r")) == NULL) {
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104 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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105 exit(1);
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106 }
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107 strcpy(signature_name, optarg);
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108 break;
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109 case 'v':
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110 verbose = atoi(optarg);
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111 if (verbose < 0) {
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112 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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113 exit(1);
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114 }
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115 break;
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116 }
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117 }
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118
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119 argc -= optind;
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120 argv += optind;
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121
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122 if (argc > 1) {
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123 usage();
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124 exit(1);
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125 }
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126
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8
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127 if (argc == 1 && *argv[0] != '-') {
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3
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128 if ((in = fopen(argv[0], "rb")) == NULL) {
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129 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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130 exit(1);
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131 }
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132 else
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133 strcpy(input_name, argv[0]);
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8
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134 }
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135
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3
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136 if (sig) {
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137 char line[32];
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138 fgets(line, sizeof(line), sig);
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139 if (strspn(line, "KD3SG") >= 5) {
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140 fscanf(sig, "%d\n", &nbit_signature);
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141 if (quality == 0)
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142 fscanf(sig, "%d\n", &quality);
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143 else
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144 fscanf(sig, "%*d\n");
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145 if (method < 0)
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146 fscanf(sig, "%d\n", &method);
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147 else
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148 fscanf(sig, "%*d\n");
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149 if (filter == 0)
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150 fscanf(sig, "%d\n", &filter);
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151 else
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152 fscanf(sig, "%*d\n");
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153 if (!strcmp(filter_name, ""))
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15
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154 fscanf(sig, "%[^\n\r]\n", filter_name);
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3
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155 else
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156 fscanf(sig, "%*[^\n\r]\n");
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157 if (level == 0)
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158 fscanf(sig, "%d\n", &level);
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159 else
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160 fscanf(sig, "%*d\n");
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161 fscanf(sig, "%d\n", &seed);
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162 srandom(seed);
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163 n_signature = NBITSTOBYTES(nbit_signature);
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164 binstr = malloc((nbit_signature + 1) * sizeof(char));
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165 fscanf(sig, "%[01]\n", binstr);
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166 binstr_to_sig(binstr);
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167 free(binstr);
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168 }
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169 else {
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170 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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171 exit(1);
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172 }
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173 fclose(sig);
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174 }
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175 else {
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176 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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177 exit(1);
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178 }
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179
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180 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
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181
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182 if (verbose > 0)
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183 fprintf(stderr, "%s: embedding %d bits with quality %d in\n"
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184 " %d x %d host image, decomposition level %d\n",
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185 progname, nbit_signature, quality, cols, rows, level);
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186
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187 image = pgm_allocarray(cols, rows);
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188
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189 for (row = 0; row < rows; row++)
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190 pgm_readpgmrow(in, image[row], cols, maxval, format);
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191
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192 fclose(in);
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193
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194 // decomposition of image
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195 init_dwt(cols, rows, filter_name, filter, level, method);
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196 #ifdef POLLEN_STUFF
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197 #include "pollen_stuff.c"
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198 #endif
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199 #ifdef PARAM_STUFF
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200 #include "param_stuff.c"
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201 #endif
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202
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203 dwts = fdwt(image);
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204
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205 p = dwts;
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206
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207 // consider each resolution level
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208 while (p->coarse->level < level)
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209 // descend one level
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210 p = p->coarse;
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211
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212 // start to embed signature from beginning at each level
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213 // get width and height of detail images at current level
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214 {
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215 int lwidth = p->vertical->image->width;
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216 int lheight = p->vertical->image->height;
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217
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218 if (verbose > 1)
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219 fprintf(stderr, "%s: embedding at level %d now, size %d x %d\n", progname,
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220 p->coarse->level, lwidth, lheight);
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221
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222 #define STEP 3
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223 n = 0;
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224 // consider each coefficient at resolution level
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225 for (row = 0; row < lwidth - STEP; row += STEP)
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226 for (col = 0; col < lheight - STEP; col += STEP) {
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227 double h, v, d;
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228 double *f1 = &h, *f2 = &v, *f3 = &d;
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229 double delta;
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230
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231 // key-dependant coefficient selection
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232 r = row + 1+random() % (STEP-2);
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233 c = col + 1+random() % (STEP-2);
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234
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235 // get coefficient values, one from each detail image
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236 h = get_pixel(p->horizontal->image, c, r);
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237 v = get_pixel(p->vertical->image, c, r);
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238 d = get_pixel(p->diagonal->image, c, r);
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239
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240 // order pointer to coefficient values such that f1 <= f2 <= f3
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241 #define SWAP(A, B) {double *t = A; A = B; B = t;}
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242 if (*f1 > *f2) SWAP(f1, f2);
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243 if (*f2 > *f3) SWAP(f2, f3);
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244 if (*f1 > *f2) SWAP(f1, f2);
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245
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246 if (verbose > 2)
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247 fprintf(stderr, "%s: embedding bit #%d (= %d) at (%d/%d),\n",
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248 progname, n, get_signature_bit(n % nbit_signature), c, r);
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249 if (verbose > 5)
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250 fprintf(stderr, " h=%lf, v=%lf, d=%lf\n", h, v, d);
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251 if (verbose > 2)
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252 fprintf(stderr, " f1=%lf, f2=%lf", *f1, *f2);
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253
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254 #define MIN_DIFF 20.0
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255 if (*f3 - *f1 < MIN_DIFF) {
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256 double adj = (MIN_DIFF - (*f3 - *f1)) / 2.0;
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257 *f1 -= adj;
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258 *f3 += adj;
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259 }
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260
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261 // calculate delta, the width of the bins
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262 delta = (*f3 - *f1) / (double) (2 * quality - 1);
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263
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264 // set middle coefficient to closest appropriate bin,
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265 // according to watermark bit
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266 if (quality == 1)
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267 *f2 = get_signature_bit(n % nbit_signature) ? *f3 : *f1;
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268 else {
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269 double l = get_signature_bit(n % nbit_signature) ? *f1 + delta : *f1;
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270 while ((l + 2 * delta) < *f2) l += 2 * delta;
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271 *f2 = (*f2 - l) < (l + 2 * delta - *f2) ? l : l + 2 * delta;
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272 }
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273
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274 if (verbose > 2)
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275 fprintf(stderr, " -> %lf, f3=%lf\n", *f2, *f3);
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276
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277 // write pixels, one of them modified
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278 set_pixel(p->horizontal->image, c, r, h);
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279 set_pixel(p->vertical->image, c, r, v);
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280 set_pixel(p->diagonal->image, c, r, d);
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281
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282 n++;
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283
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284 }
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285 }
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286
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287 idwt(dwts, image);
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288
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289 pgm_writepgminit(out, cols, rows, maxval, 0);
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290
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291 for (row = 0; row < rows; row++)
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292 pgm_writepgmrow(out, image[row], cols, maxval, 0);
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293
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294 fclose(out);
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295
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296 pgm_freearray(image, rows);
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297
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298 exit(0);
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299 }
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