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1 #include "wm.h"
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2 #include "dct.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] [-s file] [-v n] -i file file\n\n", progname);
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9 fprintf(stderr, "\t-a n\t\talpha factor (default 0.3)\n");
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10 fprintf(stderr, "\t-h\t\tprint usage\n");
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11 fprintf(stderr, "\t-i file\t\toriginal image file\n");
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12 fprintf(stderr, "\t-n n\t\twatermark length (default 100)\n");
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13 fprintf(stderr, "\t-o file\t\textracted signature file\n");
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14 fprintf(stderr, "\t-s file\t\toriginal signature file\n");
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15 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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16 exit(0);
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17 }
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18
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19 int main(int argc, char *argv[]) {
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20
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21 FILE *in = stdin;
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22 FILE *out = stdout;
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23 FILE *orig = NULL;
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24 FILE *sig = NULL;
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25
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26 gray **input_image;
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27 gray **orig_image;
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28
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29 char signature_name[MAXPATHLEN];
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30 char output_name[MAXPATHLEN] = "(stdout)";
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31 char input_name[MAXPATHLEN] = "(stdin)";
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32 char orig_name[MAXPATHLEN];
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33
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34 int c;
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35 int r;
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36 int i, j;
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37 int n = 100;
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38
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39 double a = 0.3;
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40
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41 int warn_n = 1;
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42 int warn_a = 1;
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43
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44 int in_rows, in_cols, in_format;
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45 gray in_maxval;
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46 int orig_rows, orig_cols, orig_format;
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47 gray orig_maxval;
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48 int rows, cols;
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49 int row, col;
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50
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51 double threshold;
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52 double *largest;
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53
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54 double **input_dcts;
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55 double **orig_dcts;
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56
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57 int verbose = 0;
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58
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59 progname = argv[0];
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60
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61 pgm_init(&argc, argv); wm_init2();
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62
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63 while ((c = getopt(argc, argv, "h?i:n:o:s:v:")) != EOF) {
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64 switch (c) {
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65 case 'a':
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66 a = atof(optarg);
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67 if (a <= 0.0) {
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68 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a);
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69 exit(1);
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70 }
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71 warn_a = 0;
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72 break;
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73 case 'h':
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74 case '?':
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75 usage();
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76 break;
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77 case 'i':
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78 if ((orig = fopen(optarg, "rb")) == NULL) {
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79 fprintf(stderr, "%s: unable to open original image file %s\n", progname, optarg);
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80 exit(1);
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81 }
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82 strcpy(orig_name, optarg);
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83 break;
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84 case 'n':
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85 n = atoi(optarg);
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86 if (n < 1 || n > 1000) {
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87 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
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88 exit(1);
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89 }
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90 warn_n = 0;
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91 break;
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92 case 'o':
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93 if ((out = fopen(optarg, "w")) == NULL) {
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94 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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95 exit(1);
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96 }
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97 strcpy(output_name, optarg);
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98 break;
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99 case 's':
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100 if ((sig = fopen(optarg, "r")) == NULL) {
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101 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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102 exit(1);
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103 }
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104 strcpy(signature_name, optarg);
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105 break;
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106 case 'v':
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107 verbose = atoi(optarg);
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108 if (verbose < 0) {
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109 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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110 exit(1);
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111 }
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112 break;
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113 }
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114 }
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115
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116 argc -= optind;
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117 argv += optind;
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118
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119 if (argc > 1) {
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120 usage();
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121 exit(1);
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122 }
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123
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124 if (argc == 1 && *argv[0] != '-')
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125 if ((in = fopen(argv[0], "rb")) == NULL) {
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126 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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127 exit(1);
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128 }
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129 else
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130 strcpy(input_name, argv[0]);
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131
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132 if (!orig) {
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133 fprintf(stderr, "%s: original image file not specified, use -i file option\n", progname);
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134 exit(1);
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135 }
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136
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137 if (sig) {
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138 char line[32];
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139 fgets(line, sizeof(line), sig);
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140 if (strspn(line, "CXSG") >= 4) {
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141 fscanf(sig, "%d\n", &n);
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142 if (warn_a)
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143 fscanf(sig, "%lf\n", &a);
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144 else
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145 fscanf(sig, "%*lf\n");
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146 fscanf(sig, "%*lf\n");
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147 fscanf(sig, "%*lf\n");
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148 }
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149 else {
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150 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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151 exit(1);
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152 }
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153 fclose(sig);
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154 }
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155 else {
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156 if (warn_a)
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157 fprintf(stderr, "%s: warning - alpha factor not specified, using default %f\n", progname, a);
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158 if (warn_n)
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159 fprintf(stderr, "%s: warning - watermark length not specified, using default %d\n", progname, n);
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160 }
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161
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162 pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
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163 pgm_readpgminit(orig, &orig_cols, &orig_rows, &orig_maxval, &orig_format);
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164
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165 if (in_cols != orig_cols || in_rows != orig_rows) {
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166 fprintf(stderr, "%s: input image %s does not match dimensions of original image %s\n", progname, input_name, orig_name);
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167 exit(1);
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168 }
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169
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170 cols = in_cols;
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171 rows = in_rows;
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172
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173 init_dct_NxN(cols, rows);
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174
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175 input_image = pgm_allocarray(in_cols, in_rows);
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176
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177 orig_image = pgm_allocarray(orig_cols, orig_rows);
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178
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179 for (row = 0; row < in_rows; row++)
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180 pgm_readpgmrow(in, input_image[row], in_cols, in_maxval, in_format);
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181
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182 fclose(in);
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183
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184 for (row = 0; row < orig_rows; row++)
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185 pgm_readpgmrow(orig, orig_image[row], orig_cols, orig_maxval, orig_format);
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186
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187 fclose(orig);
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188
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189 input_dcts = alloc_coeffs(cols, rows);
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190 orig_dcts = alloc_coeffs(cols, rows);
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191
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192 fdct_NxN(input_image, input_dcts);
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193 fdct_NxN(orig_image, orig_dcts);
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194
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195 largest = malloc((n + 1) * sizeof(double));
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196 select_largest_coeffs(orig_dcts[0], cols * rows, n+1, largest);
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197 threshold = largest[0];
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198 free(largest);
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199
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200 fprintf(out, "CXWM\n");
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201 fprintf(out, "%d\n", n);
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202
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203 j = 0;
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204 for (i = 0; i < n; i++) {
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205 double d, o, p;
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206
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207 while ((o = orig_dcts[j / cols][j % cols]) < threshold) j++;
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208
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209 p = input_dcts[j / cols][j % cols];
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210
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211 d = (p / o - 1.0) / a;
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212 if (verbose >= 1)
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213 fprintf(stderr, "input %f orig %f alpha %f d %f\n", p, o, a, d);
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214 fprintf(out, "%f\n", d);
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215 j++;
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216 }
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217
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218 fclose(out);
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219
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220 free_coeffs(input_dcts);
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221 free_coeffs(orig_dcts);
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222
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223 pgm_freearray(input_image, rows);
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224 pgm_freearray(orig_image, rows);
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225
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226 exit(0);
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227 }
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