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1 #include "wm.h"
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2 #include "wm_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] [-h] [-n n] [-o file] [-q n] [-s file] [-v n] -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-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-i file\t\toriginal image file\n");
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15 fprintf(stderr, "\t-n n\t\twatermark length\n");
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16 fprintf(stderr, "\t-o file\t\textracted signature file\n");
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17 fprintf(stderr, "\t-q n\t\tquantization/quality factor\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 int main(int argc, char *argv[]) {
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24
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25 FILE *in = stdin;
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26 FILE *out = stdout;
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27 FILE *orig = NULL;
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28 FILE *sig = NULL;
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29
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30 gray **input_image;
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31 gray **orig_image;
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32
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33 char signature_name[MAXPATHLEN];
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34 char output_name[MAXPATHLEN] = "(stdout)";
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35 char input_name[MAXPATHLEN] = "(stdin)";
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36 char orig_name[MAXPATHLEN];
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37
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38 int c;
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39 int i;
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40 int quantization = 0;
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41 int n = 0;
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42 int method = -1;
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43 int filter = 0;
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44 char filter_name[MAXPATHLEN] = "";
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45
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46 int level;
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47 double alpha = 0.0;
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48
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49 int in_rows, in_cols, in_format;
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50 gray in_maxval;
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51 int orig_rows, orig_cols, orig_format;
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52 gray orig_maxval;
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53 int rows, cols;
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54 int row, col;
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55
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56 Image_tree input_dwts;
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57 Image_tree orig_dwts;
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58
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59 int verbose = 0;
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60
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61 progname = argv[0];
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62
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63 pgm_init(&argc, argv); wm_init2();
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64
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65 while ((c = getopt(argc, argv, "a:e:f:F:h?i:n:o:s:v:")) != EOF) {
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66 switch (c) {
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67 case 'a':
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68 alpha = atof(optarg);
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69 if (alpha <= 0.0) {
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70 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha);
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71 exit(1);
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72 }
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73 break;
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74 case 'e':
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75 method = atoi(optarg);
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76 if (method < 0) {
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77 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
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78 exit(1);
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79 }
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80 break;
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81 case 'f':
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82 filter = atoi(optarg);
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83 if (filter <= 0) {
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84 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
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85 exit(1);
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86 }
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87 break;
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88 case 'F':
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89 strcpy(filter_name, optarg);
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90 break;
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91 case 'h':
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92 case '?':
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93 usage();
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94 break;
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95 case 'i':
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96 if ((orig = fopen(optarg, "rb")) == NULL) {
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97 fprintf(stderr, "%s: unable to open original image file %s\n", progname, optarg);
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98 exit(1);
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99 }
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100 strcpy(orig_name, optarg);
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101 break;
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102 case 'n':
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103 n = atoi(optarg);
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104 if (n < 1 || n > 1000) {
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105 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
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106 exit(1);
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107 }
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108 break;
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109 case 'o':
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110 if ((out = fopen(optarg, "w")) == NULL) {
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111 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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112 exit(1);
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113 }
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114 strcpy(output_name, optarg);
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115 break;
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116 case 's':
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117 if ((sig = fopen(optarg, "r")) == NULL) {
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118 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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119 exit(1);
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120 }
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121 strcpy(signature_name, optarg);
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122 break;
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123 case 'v':
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124 verbose = atoi(optarg);
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125 if (verbose < 0) {
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126 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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127 exit(1);
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128 }
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129 break;
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130 }
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131 }
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132
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133 argc -= optind;
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134 argv += optind;
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135
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136 if (argc > 1) {
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137 usage();
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138 exit(1);
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139 }
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140
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141 if (argc == 1 && *argv[0] != '-')
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142 if ((in = fopen(argv[0], "rb")) == NULL) {
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143 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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144 exit(1);
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145 }
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146 else
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147 strcpy(input_name, argv[0]);
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148
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149 if (!orig) {
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150 fprintf(stderr, "%s: original image file not specified, use -i file option\n", progname);
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151 exit(1);
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152 }
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153
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154 if (sig) {
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155 char line[32];
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156 fgets(line, sizeof(line), sig);
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157 if (strspn(line, "CVSG") >= 4) {
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158 fscanf(sig, "%d\n", &n);
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159 if (alpha == 0.0)
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160 fscanf(sig, "%lf\n", &alpha);
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161 else
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162 fscanf(sig, "%*lf\n");
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163 if (quantization == 0)
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164 fscanf(sig, "%d\n", &quantization);
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165 else
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166 fscanf(sig, "%*d\n");
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167 if (method < 0)
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168 fscanf(sig, "%d\n", &method);
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169 else
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170 fscanf(sig, "%*d\n");
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171 if (filter == 0)
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172 fscanf(sig, "%d\n", &filter);
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173 else
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174 fscanf(sig, "%*d\n");
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175 if (!strcmp(filter_name, ""))
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15
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176 fscanf(sig, "%[^\n\r]\n", filter_name);
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0
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177 else
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178 fscanf(sig, "%*[^\n\r]\n");
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179 }
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180 else {
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181 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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182 exit(1);
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183 }
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184 fclose(sig);
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185 }
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186 else {
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187 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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188 exit(1);
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189 }
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190
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191 pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
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192 pgm_readpgminit(orig, &orig_cols, &orig_rows, &orig_maxval, &orig_format);
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193
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194 if (in_cols != orig_cols || in_rows != orig_rows) {
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195 fprintf(stderr, "%s: input image %s does not match dimensions of original image %s\n", progname, input_name, orig_name);
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196 exit(1);
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197 }
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198
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199 cols = in_cols;
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200 rows = in_rows;
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201
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202 input_image = pgm_allocarray(in_cols, in_rows);
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203
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204 orig_image = pgm_allocarray(orig_cols, orig_rows);
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205
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206 for (row = 0; row < in_rows; row++)
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207 pgm_readpgmrow(in, input_image[row], in_cols, in_maxval, in_format);
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208
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209 fclose(in);
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210
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211 for (row = 0; row < orig_rows; row++)
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212 pgm_readpgmrow(orig, orig_image[row], orig_cols, orig_maxval, orig_format);
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213
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214 fclose(orig);
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215
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216 level = 0;
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217 row = rows;
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218 col = cols;
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219 while (n < row * col / 4.0 && row >= 2 && col >= 2) {
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220 row /= 2;
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221 col /= 2;
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222 level++;
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223 }
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224
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225 if (verbose >= 2) {
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226 fprintf(stderr, "%s: extracting from coarse image (x %d/y %d) at level %d\n", progname, col, row, level);
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227 }
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228
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229 init_dwt(cols, rows, filter_name, filter, level, method);
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230 input_dwts = fdwt(input_image);
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231 orig_dwts = fdwt(orig_image);
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232
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233 fprintf(out, "CVSG\n");
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234 fprintf(out, "%d\n", n);
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235 fprintf(out, "%f\n", alpha);
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236 fprintf(out, "%d\n", quantization);
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237 fprintf(out, "%d\n", method);
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238 fprintf(out, "%d\n", filter);
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239 fprintf(out, "%s\n", filter_name);
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240
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241 {
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242 Image_tree p = input_dwts;
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243 Image_tree q = orig_dwts;
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244 Image input_img;
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245 Image orig_img;
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246 double input_med;
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247 double orig_med;
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248
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249 while (!p->image)
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250 p = p->coarse;
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251
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252 while (!q->image)
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253 q = q->coarse;
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254
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255 input_img = p->image;
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256 orig_img = q->image;
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257
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258 input_med = 0.0;
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259 for (row = 0; row < input_img->height; row++)
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260 for (col = 0; col < input_img->width; col++)
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261 input_med += get_pixel(input_img, col, row);
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262 input_med /= input_img->height * input_img->width;
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263
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264 orig_med = 0.0;
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265 for (row = 0; row < orig_img->height; row++)
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266 for (col = 0; col < orig_img->width; col++)
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267 orig_med += get_pixel(orig_img, col, row);
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268 orig_med /= orig_img->height * orig_img->width;
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269
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270 row = 0;
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271 col = 0;
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272 while (n > 0) {
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273 Pixel input_pix;
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274 Pixel orig_pix;
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275 double x;
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276
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277 input_pix = get_pixel(input_img, col, row);
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278 orig_pix = get_pixel(orig_img, col, row);
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279
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280 x = ((input_pix - orig_pix) / (orig_pix - orig_med)) / alpha;
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281
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282 fprintf(out, "%f\n", x);
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283
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284 if (++col == orig_img->width) { col = 0; row++; }
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285 n--;
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286 }
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287 }
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288
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289 fclose(out);
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290
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291 pgm_freearray(input_image, rows);
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292 pgm_freearray(orig_image, rows);
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293
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294 exit(0);
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295 }
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