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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] [-v n] -s file -i file file\n\n", progname);
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9 fprintf(stderr, "\t-a n\t\talpha factor\n");
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10 fprintf(stderr, "\t-b n\t\tbeta factor\n");
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11 fprintf(stderr, "\t-e n\t\twavelet filtering method\n");
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12 fprintf(stderr, "\t-f n\t\tfilter number\n");
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13 fprintf(stderr, "\t-F file\t\tfilter definition file\n");
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14 fprintf(stderr, "\t-h\t\tprint usage\n");
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15 fprintf(stderr, "\t-i file\t\toriginal image file\n");
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16 fprintf(stderr, "\t-l n\t\tdecomposition level\n");
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17 fprintf(stderr, "\t-o file\t\tfile for extracted watermark\n");
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18 fprintf(stderr, "\t-s file\t\toriginal signature file\n");
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19 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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20 exit(0);
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21 }
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22
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23 void write_mark(FILE *out, double watermark[], int n) {
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24 int i;
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25
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26 fprintf(out, "%d\n", n);
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27 for (i = 0; i < n; i++)
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28 fprintf(out, "%f\n", watermark[i]);
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29 }
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30
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31 int main(int argc, char *argv[]) {
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32
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33 FILE *in = stdin;
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34 FILE *out = stdout;
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35 FILE *orig = NULL;
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36 FILE *sig = NULL;
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37
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38 gray **input_image;
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39 gray **orig_image;
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40
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41 char signature_name[MAXPATHLEN];
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42 char output_name[MAXPATHLEN] = "(stdout)";
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43 char input_name[MAXPATHLEN] = "(stdin)";
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44 char orig_name[MAXPATHLEN];
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45
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46 int c, w;
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47 int i;
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48 int n = 0;
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49 int method = -1;
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50 int filter = 0;
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51 char filter_name[MAXPATHLEN] = "";
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52
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53 int level = 0, levels;
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54 double alpha = 0.0;
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55
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56 int in_rows, in_cols, in_format;
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57 gray in_maxval;
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58 int orig_rows, orig_cols, orig_format;
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59 gray orig_maxval;
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60 int rows, cols;
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61 int row, col;
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62
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63 double *watermark;
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64
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65 Image_tree input_dwts, orig_dwts, p, q;
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66
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67 int verbose = 0;
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68
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69 progname = argv[0];
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70
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71 pgm_init(&argc, argv); wm_init2();
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72
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73 while ((c = getopt(argc, argv, "a:e:f:F:h?i:l:o:s:v:")) != EOF) {
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74 switch (c) {
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75 case 'a':
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76 alpha = atof(optarg);
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77 if (alpha <= 0.0) {
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78 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha);
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79 exit(1);
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80 }
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81 break;
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82 case 'e':
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83 method = atoi(optarg);
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84 if (method < 0) {
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85 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
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86 exit(1);
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87 }
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88 break;
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89 case 'f':
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90 filter = atoi(optarg);
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91 if (filter <= 0) {
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92 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
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93 exit(1);
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94 }
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95 break;
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96 case 'F':
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97 strcpy(filter_name, optarg);
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98 break;
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99 case 'h':
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100 case '?':
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101 usage();
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102 break;
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103 case 'i':
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104 if ((orig = fopen(optarg, "rb")) == NULL) {
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105 fprintf(stderr, "%s: unable to open original image file %s\n", progname, optarg);
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106 exit(1);
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107 }
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108 strcpy(orig_name, optarg);
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109 break;
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110 case 'l':
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111 level = atoi(optarg);
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112 if (level <= 0) {
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113 fprintf(stderr, "%s: decomposition level %d out of range\n", progname, level);
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114 exit(1);
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115 }
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116 break;
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117 case 'o':
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118 if ((out = fopen(optarg, "w")) == NULL) {
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119 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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120 exit(1);
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121 }
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122 strcpy(output_name, optarg);
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123 break;
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124 case 's':
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125 if ((sig = fopen(optarg, "r")) == NULL) {
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126 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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127 exit(1);
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128 }
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129 strcpy(signature_name, optarg);
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130 break;
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131 case 'v':
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132 verbose = atoi(optarg);
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133 if (verbose < 0) {
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134 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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135 exit(1);
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136 }
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137 break;
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138 }
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139 }
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140
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141 argc -= optind;
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142 argv += optind;
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143
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144 if (argc > 1) {
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145 usage();
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146 exit(1);
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147 }
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148
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149 if (argc == 1 && *argv[0] != '-')
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150 if ((in = fopen(argv[0], "rb")) == NULL) {
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151 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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152 exit(1);
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153 }
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154 else
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155 strcpy(input_name, argv[0]);
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156
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157 if (!orig) {
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158 fprintf(stderr, "%s: original image file not specified, use -i file option\n", progname);
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159 exit(1);
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160 }
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161
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162 if (sig) {
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163 char line[32];
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164 fgets(line, sizeof(line), sig);
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165 if (strspn(line, "ZHSG") >= 4) {
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166 fscanf(sig, "%d\n", &n);
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167 if (alpha == 0.0)
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168 fscanf(sig, "%lf\n", &alpha);
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169 else
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170 fscanf(sig, "%*lf\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 if (method < 0)
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176 fscanf(sig, "%d\n", &method);
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177 else
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178 fscanf(sig, "%*d\n");
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179 if (filter == 0)
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180 fscanf(sig, "%d\n", &filter);
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181 else
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182 fscanf(sig, "%*d\n");
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183 if (!strcmp(filter_name, ""))
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184 fscanf(sig, "%[^\n\r]\n", &filter_name);
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185 else
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186 fscanf(sig, "%*[^\n\r]\n");
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187 }
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188 else {
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189 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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190 exit(1);
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191 }
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192 fclose(sig);
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193 }
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194 else {
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195 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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196 exit(1);
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197 }
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198
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199 pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
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200 pgm_readpgminit(orig, &orig_cols, &orig_rows, &orig_maxval, &orig_format);
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201
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202 if (in_cols != orig_cols || in_rows != orig_rows) {
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203 fprintf(stderr, "%s: input image %s does not match dimensions of original image %s\n", progname, input_name, orig_name);
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204 exit(1);
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205 }
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206
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207 cols = in_cols;
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208 rows = in_rows;
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209
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210 input_image = pgm_allocarray(in_cols, in_rows);
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211 orig_image = pgm_allocarray(orig_cols, orig_rows);
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212
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213 for (row = 0; row < in_rows; row++) {
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214 pgm_readpgmrow(in, input_image[row], in_cols, in_maxval, in_format);
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215 pgm_readpgmrow(orig, orig_image[row], orig_cols, orig_maxval, orig_format);
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216 }
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217
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218 fclose(in);
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219 fclose(orig);
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220
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221 // complete decomposition
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222 levels = find_deepest_level(cols, rows) - 1;
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223 if (level > levels) {
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224 fprintf(stderr, "%s: decomposition level %d not possible (max. %d), image size is %d x %d\n", progname, level, levels, cols, rows);
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225 exit(1);
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226 }
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227
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228 init_dwt(cols, rows, filter_name, filter, levels, method);
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229 #ifdef POLLEN_STUFF
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3
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230 #include "pollen_stuff.c"
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0
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231 #endif
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232 #ifdef PARAM_STUFF
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3
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233 #include "param_stuff.c"
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0
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234 #endif
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235
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236 input_dwts = fdwt(input_image);
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237 orig_dwts = fdwt(orig_image);
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238
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239 watermark = malloc(n * sizeof(double));
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240 if (!watermark) {
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241 fprintf(stderr, "%s: malloc() failed\n\n", progname);
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242 exit(1);
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243 }
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244
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245 fprintf(out, "ZHWM\n");
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246 fprintf(out, "%d\n", n);
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247 fprintf(out, "%d\n", level);
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248
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249 p = input_dwts;
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250 q = orig_dwts;
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251 while (p->coarse && q->coarse) {
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252 double *collected_coeffs, *largest;
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253 int subband_size = q->horizontal->image->size;
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254 int maxselect = MIN(3 * subband_size, n + 1);
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255 double threshold;
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256
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257 collected_coeffs = malloc(3 * subband_size * sizeof(double));
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258 if (!collected_coeffs) {
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259 fprintf(stderr, "%s: malloc() failed\n", progname);
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260 exit(1);
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261 }
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262
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263 for (i = 0; i < subband_size; i++) {
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264 collected_coeffs[3 * i + 0] = q->horizontal->image->data[i];
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265 collected_coeffs[3 * i + 1] = q->vertical->image->data[i];
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266 collected_coeffs[3 * i + 2] = q->diagonal->image->data[i];
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267 }
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268
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269 largest = malloc(maxselect * sizeof(double));
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270 if (!largest) {
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271 fprintf(stderr, "%s: malloc() failed\n", progname);
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272 exit(1);
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273 }
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274
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275 select_largest_coeffs(collected_coeffs, 3 * subband_size, maxselect, largest);
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276 threshold = largest[0];
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277 free(largest);
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278 free(collected_coeffs);
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279
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280 w = 0;
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281 for (i = 0; i < subband_size && w < n; i++) {
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282 if (q->horizontal->image->data[i] > threshold)
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283 watermark[w++] = (p->horizontal->image->data[i] / q->horizontal->image->data[i] - 1.0) / alpha;
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284 if (q->vertical->image->data[i] > threshold)
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285 watermark[w++] = (p->vertical->image->data[i] / q->vertical->image->data[i] - 1.0) / alpha;
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286 if (q->diagonal->image->data[i] > threshold)
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287 watermark[w++] = (p->diagonal->image->data[i] / q->diagonal->image->data[i] - 1.0) / alpha;
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288 }
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289
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290 write_mark(out, watermark, w);
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291
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292 p = p->coarse;
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293 q = q->coarse;
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294 }
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295
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296 fclose(out);
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297
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298 free(watermark);
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299
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300 pgm_freearray(input_image, rows);
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301 pgm_freearray(orig_image, rows);
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302
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303 exit(0);
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304 }
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