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1 #include "wm.h"
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2 #include "dwt.h"
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3 #include "pgm.h"
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4
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5 char *progname;
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6
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7 void usage(void) {
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8 fprintf(stderr, "usage: %s [-a n] [-e n] [-f n] [-F file] [-h] [-l n] [-o file] [-t n] [-v n] -s file file\n\n", progname);
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9 fprintf(stderr, "\t-a n\t\talpha factor/embedding strength\n");
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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\tdecomposition levels\n");
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15 fprintf(stderr, "\t-o file\t\toutput (watermarked) file\n");
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16 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\n");
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17 fprintf(stderr, "\t-t n\t\tcasting threshold\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 // actual watermarking procedure: embeds a watermark of n normally
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23 // distributed values into a coefficients > threshold t1 of a subband
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24 void wm_subband(Image s, double *w, int n, double a, double t1) {
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25 int i;
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26
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27 for (i = 0; i < s->width * s->height; i++)
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28 if (fabs(s->data[i]) > t1)
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29 s->data[i] += (a * fabs(s->data[i]) * w[i % n]);
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30 }
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31
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32 int main(int argc, char *argv[]) {
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33
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34 FILE *in = stdin;
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35 FILE *out = stdout;
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36 FILE *sig = NULL;
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37
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38 char output_name[MAXPATHLEN] = "(stdout)";
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39 char input_name[MAXPATHLEN] = "(stdin)";
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40 char signature_name[MAXPATHLEN];
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41
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42 int i, c;
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43 int row, col;
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44
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45 int n;
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46
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47 double alpha = 0.0;
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48 double t1 = 0.0;
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49
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50 int levels = 0;
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51 int filter = 0;
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52 int method = -1;
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53 char filter_name[MAXPATHLEN] = "";
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54
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55 int verbose = 0;
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56
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57 gray **image;
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58 Image_tree dwts, s;
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59
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60 gray maxval;
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61 int rows, cols, colors, format;
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62
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63 double *watermark;
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64
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65 progname = argv[0];
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66
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67 pgm_init(&argc, argv); wm_init();
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68
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69 while ((c = getopt(argc, argv, "a:e:f:F:h?l:o:s:t:v:")) != EOF) {
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70 switch (c) {
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71 case 'a':
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72 alpha = atof(optarg);
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73 if (alpha <= 0.0) {
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74 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha);
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75 exit(1);
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76 }
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77 break;
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78 case 'e':
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79 method = atoi(optarg);
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80 if (method < 0) {
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81 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
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82 exit(1);
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83 }
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84 break;
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85 case 'f':
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86 filter = atoi(optarg);
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87 if (filter <= 0) {
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88 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
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89 exit(1);
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90 }
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91 break;
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92 case 'F':
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93 strcpy(filter_name, optarg);
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94 break;
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95 case 'h':
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96 case '?':
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97 usage();
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98 break;
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99 case 'l':
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100 levels = atoi(optarg);
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101 if (levels <= 0) {
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102 fprintf(stderr, "%s: decomposition level %d out of range\n", levels);
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103 exit(1);
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104 }
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105 break;
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106 case 'o':
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107 if ((out = fopen(optarg, "wb")) == NULL) {
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108 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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109 exit(1);
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110 }
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111 strcpy(output_name, optarg);
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112 break;
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113 case 's':
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114 if ((sig = fopen(optarg, "r")) == NULL) {
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115 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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116 exit(1);
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117 }
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118 strcpy(signature_name, optarg);
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119 break;
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120 case 't':
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121 t1 = atof(optarg);
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122 if (t1 <= 0.0) {
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123 fprintf(stderr, "%s: casting threshold %f out of range\n", progname, t1);
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124 exit(1);
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125 }
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126 break;
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127 case 'v':
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128 verbose = atoi(optarg);
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129 if (verbose < 0) {
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130 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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131 exit(1);
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132 }
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133 break;
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134 }
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135 }
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136
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137 argc -= optind;
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138 argv += optind;
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139
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140 if (argc > 1) {
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141 usage();
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142 exit(1);
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143 }
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144
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145 if (argc == 1 && *argv[0] != '-')
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146 if ((in = fopen(argv[0], "rb")) == NULL) {
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147 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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148 exit(1);
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149 }
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150 else
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151 strcpy(input_name, argv[0]);
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152
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153 if (sig) {
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154 char line[32];
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155 fgets(line, sizeof(line), sig);
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156 if (strspn(line, "DGSG") >= 4) {
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157 fscanf(sig, "%d\n", &n);
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158 if (levels == 0)
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159 fscanf(sig, "%d\n", &levels);
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160 else
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161 fscanf(sig, "%*d\n");
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162 if (alpha == 0.0)
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163 fscanf(sig, "%lf\n", &alpha);
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164 else
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165 fscanf(sig, "%*lf\n");
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166 if (t1 == 0.0)
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167 fscanf(sig, "%lf\n", &t1);
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168 else
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169 fscanf(sig, "%*lf\n");
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170 fscanf(sig, "%*lf\n");
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171 if (method < 0)
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172 fscanf(sig, "%d\n", &method);
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173 else
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174 fscanf(sig, "%*d\n");
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175 if (filter == 0)
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176 fscanf(sig, "%d\n", &filter);
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177 else
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178 fscanf(sig, "%*d\n");
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179 if (!strcmp(filter_name, ""))
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180 fscanf(sig, "%[^\n\r]\n", &filter_name);
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181 else
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182 fscanf(sig, "%*[^\n\r]\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 }
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189 else {
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190 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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191 exit(1);
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192 }
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193
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194 watermark = malloc(n * sizeof(double));
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195 for (i = 0; i < n; i++)
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196 fscanf(sig, "%lf\n", &watermark[i]);
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197 fclose(sig);
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198
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199 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
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200
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201 image = pgm_allocarray(cols, rows);
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202
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203 for (row = 0; row < rows; row++)
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204 pgm_readpgmrow(in, image[row], cols, maxval, format);
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205
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206 fclose(in);
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207
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208 // wavelet transform
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209 init_dwt(cols, rows, filter_name, filter, 3, method);
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210 #ifdef POLLEN_STUFF
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211 #include "pollen_stuff.xxx"
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212 #endif
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213 #ifdef PARAM_STUFF
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214 #include "param_stuff.xxx"
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215 #endif
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216
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217 dwts = fdwt(image);
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218
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219 // embed watermark in all subbands of a decomposition level
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220 for (i = 0, s = dwts; i < 3; i++, s = s->coarse) {
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221 wm_subband(s->horizontal->image, watermark, n, alpha, t1);
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222 wm_subband(s->vertical->image, watermark, n, alpha, t1);
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223 wm_subband(s->diagonal->image, watermark, n, alpha, t1);
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224 }
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225
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226 free(watermark);
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227
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228 idwt(dwts, image);
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229
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230 pgm_writepgminit(out, cols, rows, maxval, 0);
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231
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232 for (row = 0; row < rows; row++)
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233 pgm_writepgmrow(out, image[row], cols, maxval, 0);
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234
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235 fclose(out);
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236
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237 pgm_freearray(image, rows);
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238
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239 exit(0);
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240 }
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