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1 #include "wm.h"
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2 #include "dwt.h"
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3 #include "wang_common.h"
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4 #include "dwt_util.h"
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5 #include "pgm.h"
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6
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7 char *progname;
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8
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9 void usage(void) {
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10 fprintf(stderr, "usage: %s [-a n] [-b n] [-e n] [-f n] [-F file] [-h] [-n n] [-o file] [-v n] -s file -i file file\n\n", progname);
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11 fprintf(stderr, "\t-a n\t\talpha factor\n");
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12 fprintf(stderr, "\t-b n\t\tbeta factor\n");
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13 fprintf(stderr, "\t-e n\t\twavelet filtering method\n");
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14 fprintf(stderr, "\t-f n\t\tfilter number\n");
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15 fprintf(stderr, "\t-F file\t\tfilter definition file\n");
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16 fprintf(stderr, "\t-h\t\tprint usage\n");
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17 fprintf(stderr, "\t-i file\t\toriginal image file\n");
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18 fprintf(stderr, "\t-n n\t\twatermark length\n");
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19 fprintf(stderr, "\t-o file\t\tfile for extracted watermark\n");
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20 fprintf(stderr, "\t-s file\t\toriginal signature file\n");
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21 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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22 exit(0);
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23 }
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24
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25 int main(int argc, char *argv[]) {
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26
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27 FILE *in = stdin;
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28 FILE *out = stdout;
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29 FILE *orig = NULL;
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30 FILE *sig = NULL;
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31
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32 gray **input_image;
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33 gray **orig_image;
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34
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35 char signature_name[MAXPATHLEN];
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36 char output_name[MAXPATHLEN] = "(stdout)";
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37 char input_name[MAXPATHLEN] = "(stdin)";
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38 char orig_name[MAXPATHLEN];
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39
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40 int c, w;
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41 int i;
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42 int n = 0;
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43 int method = -1;
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44 int filter = 0;
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45 char filter_name[MAXPATHLEN] = "";
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46
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47 int level, levels;
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48 double alpha = 0.0;
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49 double beta = 0.0;
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50
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51 int in_rows, in_cols, in_format;
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52 gray in_maxval;
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53 int orig_rows, orig_cols, orig_format;
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54 gray orig_maxval;
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55 int rows, cols;
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56 int row, col;
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57
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58 double *watermark;
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59
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60 Image_tree input_dwts;
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61 Image_tree orig_dwts;
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62
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63 int verbose = 0;
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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_init2();
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68
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69 while ((c = getopt(argc, argv, "a:b:e:f:F:h?i:n:o:s: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 'b':
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79 beta = atof(optarg);
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80 if (beta <= 0.0) {
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81 fprintf(stderr, "%s: beta factor %f out of range\n", progname, alpha);
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82 exit(1);
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83 }
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84 break;
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85 case 'e':
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86 method = atoi(optarg);
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87 if (method < 0) {
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88 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
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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 filter = atoi(optarg);
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94 if (filter <= 0) {
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95 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
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96 exit(1);
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97 }
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98 break;
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99 case 'F':
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100 strcpy(filter_name, optarg);
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101 break;
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102 case 'h':
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103 case '?':
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104 usage();
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105 break;
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106 case 'i':
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107 if ((orig = fopen(optarg, "rb")) == NULL) {
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108 fprintf(stderr, "%s: unable to open original image file %s\n", progname, optarg);
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109 exit(1);
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110 }
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111 strcpy(orig_name, optarg);
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112 break;
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113 case 'n':
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114 n = atoi(optarg);
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115 if (n < 1 || n > 32000) {
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116 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
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117 exit(1);
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118 }
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119 break;
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120 case 'o':
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121 if ((out = fopen(optarg, "w")) == NULL) {
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122 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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123 exit(1);
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124 }
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125 strcpy(output_name, optarg);
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126 break;
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127 case 's':
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128 if ((sig = fopen(optarg, "r")) == NULL) {
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129 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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130 exit(1);
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131 }
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132 strcpy(signature_name, optarg);
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133 break;
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134 case 'v':
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135 verbose = atoi(optarg);
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136 if (verbose < 0) {
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137 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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138 exit(1);
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139 }
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140 break;
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141 }
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142 }
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143
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144 argc -= optind;
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145 argv += optind;
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146
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147 if (argc > 1) {
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148 usage();
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149 exit(1);
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150 }
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151
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152 if (argc == 1 && *argv[0] != '-')
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153 if ((in = fopen(argv[0], "rb")) == NULL) {
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154 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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155 exit(1);
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156 }
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157 else
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158 strcpy(input_name, argv[0]);
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159
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160 if (!orig) {
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161 fprintf(stderr, "%s: original image file not specified, use -i file option\n", progname);
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162 exit(1);
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163 }
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164
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165 if (sig) {
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166 char line[32];
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167 fgets(line, sizeof(line), sig);
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168 if (strspn(line, "WGSG") >= 4) {
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169 fscanf(sig, "%d\n", &n);
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170 if (alpha == 0.0)
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171 fscanf(sig, "%lf\n", &alpha);
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172 else
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173 fscanf(sig, "%*lf\n");
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174 if (beta == 0.0)
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175 fscanf(sig, "%lf\n", &beta);
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176 else
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177 fscanf(sig, "%*lf\n");
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178 if (method < 0)
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179 fscanf(sig, "%d\n", &method);
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180 else
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181 fscanf(sig, "%*d\n");
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182 if (filter == 0)
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183 fscanf(sig, "%d\n", &filter);
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184 else
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185 fscanf(sig, "%*d\n");
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186 if (!strcmp(filter_name, ""))
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187 fscanf(sig, "%[^\n\r]\n", &filter_name);
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188 else
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189 fscanf(sig, "%*[^\n\r]\n");
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190 }
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191 else {
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192 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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193 exit(1);
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194 }
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195 fclose(sig);
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196 }
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197 else {
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198 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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199 exit(1);
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200 }
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201
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202 watermark = malloc(n * sizeof(double));
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203
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204 pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
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205 pgm_readpgminit(orig, &orig_cols, &orig_rows, &orig_maxval, &orig_format);
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206
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207 if (in_cols != orig_cols || in_rows != orig_rows) {
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208 fprintf(stderr, "%s: input image %s does not match dimensions of original image %s\n", progname, input_name, orig_name);
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209 exit(1);
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210 }
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211
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212 cols = in_cols;
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213 rows = in_rows;
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214
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215 input_image = pgm_allocarray(in_cols, in_rows);
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216
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217 orig_image = pgm_allocarray(orig_cols, orig_rows);
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218
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219 for (row = 0; row < in_rows; row++) {
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220 pgm_readpgmrow(in, input_image[row], in_cols, in_maxval, in_format);
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221 pgm_readpgmrow(orig, orig_image[row], orig_cols, orig_maxval, orig_format);
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222 }
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223
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224 fclose(in);
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225 fclose(orig);
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226
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227 // complete decomposition
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228 levels = find_deepest_level(cols, rows) - 1;
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229
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230 init_dwt(cols, rows, filter_name, filter, levels, method);
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231 #ifdef POLLEN_STUFF
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232 #include "pollen_stuff.xxx"
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233 #endif
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234 #ifdef PARAM_STUFF
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235 #include "param_stuff.xxx"
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236 #endif
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237
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238 input_dwts = fdwt(input_image);
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239 orig_dwts = fdwt(orig_image);
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240
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241 // build tree for subband selection, calculate subband thresholds
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242 init_subbands(orig_dwts);
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243 set_subbands_type_beta(HORIZONTAL, beta);
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244 set_subbands_type_beta(VERTICAL, beta);
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245 calc_subbands_threshold();
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246
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247 fprintf(out, "WGWM\n");
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248 fprintf(out, "%d\n", n);
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249
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250 w = 0;
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251 while (w < n) {
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252 Subband_data s;
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253
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254 // select subband with max. threshold
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255 s = select_subband();
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256 if (verbose > 1)
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257 fprintf(stderr, "%s: selected subband %s%d, T=%lf, beta=%lf\n", progname, subband_name(s->type), s->level, s->T, s->beta);
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258
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259 // watermark significant coefficients and set them selected
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260 // check is entire signature has been embedded
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261 c = select_subband_coeff(s);
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262 do {
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263 Pixel p;
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264 Pixel q;
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265 if (c < 0)
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266 // no more significant coefficients in subband
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267 break;
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268
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269 p = get_subband_coeff(s, c);
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270 if (p < s->Cmax) {
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271 q = get_dwt_coeff(input_dwts, s->level, s->type, c);
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272 watermark[w] = (q - p) / (alpha * s->beta * s->T);
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273 fprintf(out, "%lf\n", watermark[w]);
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274
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275 if (verbose > 2)
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276 fprintf(stderr, "%s: detected sig. coeff. #%d (= %lf)\n from %s%d coeff. #%d\n",
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277 progname, w, watermark[w], subband_name(s->type), s->level, c);
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278
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279 w++;
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280 }
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281 mark_subband_coeff(s, c);
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282
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283 // select next significant coefficient
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284 c = select_subband_coeff_from(s, c);
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285 } while (w < n);
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286
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287 // update subband threshold
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288 s->T /= 2.0;
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289
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290 }
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291
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292 fclose(out);
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293
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294 free_subbands();
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295
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296 free(watermark);
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297
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298 pgm_freearray(input_image, rows);
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299 pgm_freearray(orig_image, rows);
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300
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301 exit(0);
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302 }
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