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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 // watermarking transformation, set median pixel to quantization boundary
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9 double wm_transform(int quant, double f1, double f2, double f3, int x) {
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10 double s = (fabs(f3) - fabs(f1)) / (double) quant;
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11 double l = x ? (f1 + s) : f1;
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12 double f2new;
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13
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14 while ((l + 2 * s) < f2) l += 2 * s;
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15 f2new = ((f2 - l) < (l + 2 * s - f2)) ? l : (l + 2 * s);
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16
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17 return f2new;
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18 }
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19
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20 void usage(void) {
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21 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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22 fprintf(stderr, "\t-a n\t\tembedding strength (default 0.05)\n");
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23 fprintf(stderr, "\t-e n\t\twavelet filtering method\n");
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24 fprintf(stderr, "\t-f n\t\tfilter number\n");
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25 fprintf(stderr, "\t-F file\t\tfilter definition file\n");
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26 fprintf(stderr, "\t-l n\t\tembedding level\n");
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27 fprintf(stderr, "\t-h\t\tprint usage\n");
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28 fprintf(stderr, "\t-o file\t\toutput (watermarked) file\n");
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29 fprintf(stderr, "\t-q n\t\tquantization level\n");
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30 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\n");
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31 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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32 exit(0);
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33 }
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34
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35 int main(int argc, char *argv[]) {
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36
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37 FILE *in = stdin;
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38 FILE *out = stdout;
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39 FILE *sig = NULL;
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40
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41 char output_name[MAXPATHLEN] = "(stdout)";
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42 char input_name[MAXPATHLEN] = "(stdin)";
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43 char signature_name[MAXPATHLEN];
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44
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45 int c, n;
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46 int row, col;
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47
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48 double alpha = 0.0;
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49 int filter = 0;
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50 int method = -1;
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51 int level = 0;
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52 int quant = 0;
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53 char filter_name[MAXPATHLEN] = "";
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54
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55 int seed;
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56 int verbose = 0;
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57
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58 gray **image;
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59 Image_tree dwts, p;
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60
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61 gray maxval;
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8
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62 int rows, cols, format;
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3
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63
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64 progname = argv[0];
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65
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66 pgm_init(&argc, argv); wm_init();
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67
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68 while ((c = getopt(argc, argv, "a:e:f:F:h?l:o:s:v:")) != EOF) {
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69 switch (c) {
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70 case 'e':
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71 method = atoi(optarg);
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72 if (method < 0) {
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73 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
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74 exit(1);
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75 }
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76 break;
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77 case 'f':
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78 filter = atoi(optarg);
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79 if (filter <= 0) {
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80 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
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81 exit(1);
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82 }
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83 break;
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84 case 'F':
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85 strcpy(filter_name, optarg);
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86 break;
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87 case 'h':
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88 case '?':
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89 usage();
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90 break;
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91 case 'l':
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92 level = atoi(optarg);
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93 if (level < 1) {
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94 fprintf(stderr, "%s: embedding level out of range\n", progname);
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95 exit(1);
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96 }
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97 break;
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98 case 'o':
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99 if ((out = fopen(optarg, "wb")) == NULL) {
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100 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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101 exit(1);
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102 }
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103 strcpy(output_name, optarg);
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104 break;
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105 case 'q':
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106 quant = atoi(optarg);
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107 break;
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108 case 'a':
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109 alpha = atof(optarg);
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110 if (alpha <= 0.0) {
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111 fprintf(stderr, "%s: embedding strength factor %f out of range\n", progname, alpha);
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112 exit(1);
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113 }
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114 break;
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115 case 's':
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116 if ((sig = fopen(optarg, "r")) == NULL) {
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117 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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118 exit(1);
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119 }
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120 strcpy(signature_name, optarg);
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121 break;
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122 case 'v':
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123 verbose = atoi(optarg);
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124 if (verbose < 0) {
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125 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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126 exit(1);
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127 }
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128 break;
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129 }
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130 }
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131
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132 argc -= optind;
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133 argv += optind;
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134
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135 if (argc > 1) {
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136 usage();
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137 exit(1);
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138 }
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139
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8
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140 if (argc == 1 && *argv[0] != '-') {
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3
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141 if ((in = fopen(argv[0], "rb")) == NULL) {
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142 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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143 exit(1);
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144 }
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145 else
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146 strcpy(input_name, argv[0]);
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8
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147 }
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3
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148
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149 if (sig) {
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150 char line[32];
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151 fgets(line, sizeof(line), sig);
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152 if (strspn(line, "XE2SG") >= 5) {
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153 fscanf(sig, "%d\n", &nbit_signature);
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154 if (alpha == 0.0)
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155 fscanf(sig, "%lf\n", &alpha);
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156 else
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157 fscanf(sig, "%*lf\n");
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158 if (method < 0)
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159 fscanf(sig, "%d\n", &method);
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160 else
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161 fscanf(sig, "%*d\n");
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162 if (filter == 0)
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163 fscanf(sig, "%d\n", &filter);
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164 else
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165 fscanf(sig, "%*d\n");
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166 if (!strcmp(filter_name, ""))
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167 fscanf(sig, "%[^\n\r]\n", &filter_name);
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168 else
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169 fscanf(sig, "%*[^\n\r]\n");
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170 if (quant == 0)
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171 fscanf(sig, "%d\n", &quant);
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172 else
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173 fscanf(sig, "%*d\n");
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174 if (level == 0)
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175 fscanf(sig, "%d\n", &level);
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176 else
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177 fscanf(sig, "%*d\n");
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178 fscanf(sig, "%d\n", &seed);
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179 srandom(seed);
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180 n_signature = NBITSTOBYTES(nbit_signature);
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181 fread(signature, sizeof(char), n_signature, sig);
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182 fscanf(sig, "\n");
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183 }
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184 else {
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185 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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186 exit(1);
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187 }
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188 fclose(sig);
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189 }
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190 else {
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191 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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192 exit(1);
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193 }
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194
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195 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
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196
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197 if (verbose > 0)
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198 fprintf(stderr, "%s: embedding %d bits with strength %d in\n"
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199 " %d x %d host image, decomposition level %d\n",
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200 progname, nbit_signature, quant, cols, rows, level);
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201
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202 image = pgm_allocarray(cols, rows);
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203
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204 for (row = 0; row < rows; row++)
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205 pgm_readpgmrow(in, image[row], cols, maxval, format);
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206
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207 fclose(in);
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208
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209 // decomposition of image
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210 init_dwt(cols, rows, filter_name, filter, level, method);
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211 #ifdef POLLEN_STUFF
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212 #include "pollen_stuff.c"
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213 #endif
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214 #ifdef PARAM_STUFF
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215 #include "param_stuff.c"
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216 #endif
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217
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218 dwts = fdwt(image);
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219
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220 p = dwts;
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221
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222 // consider each resolution level
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223 while (p->level < level)
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224 // descend one level
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225 p = p->coarse;
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226
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227 // repeat binary watermark by sliding a 3-pixel window of approximation image
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228 n = 0;
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229 for (row = 0; row < p->image->height; row++) {
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230 col = 0;
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231 while (col < p->image->width - 3) {
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232 double MIN_DIFF = (20.0 * alpha);
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233 double b1, b2, b3;
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234 double *f1 = &b1, *f2 = &b2, *f3 = &b3;
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235 double f2new;
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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 if ((*f3 - *f1) < MIN_DIFF) {
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249 double adj = (MIN_DIFF - (*f3 - *f1)) / 2.0;
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250 *f1 -= adj;
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251 *f3 += adj;
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252 }
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253
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254 // apply watermarking transformation (modify median pixel)
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255 f2new = wm_transform(quant, *f1, *f2, *f3, get_signature_bit(n % nbit_signature));
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256
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257 if (verbose > 1)
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258 fprintf(stderr, "%s: embedding #%d (= %d) at (%d/%d); %f < %f -> %f < %f\n",
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259 progname, n, get_signature_bit(n % nbit_signature), col, row, *f1, *f2, f2new, *f3);
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260
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261 *f2 = f2new;
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262
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263 // write modified pixel
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264 set_pixel(p->image, col + 0, row, b1);
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265 set_pixel(p->image, col + 1, row, b2);
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266 set_pixel(p->image, col + 2, row, b3);
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267 n++;
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268 col += 3;
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269 col+= (2.0 / alpha);
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270 }
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271 }
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272
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273
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274 // skip over some pixels
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275
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276 idwt(dwts, image);
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277
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278 pgm_writepgminit(out, cols, rows, maxval, 0);
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279
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280 for (row = 0; row < rows; row++)
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281 pgm_writepgmrow(out, image[row], cols, maxval, 0);
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282
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283 fclose(out);
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284
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285 pgm_freearray(image, rows);
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286
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287 exit(0);
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288 }
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