annotate Meerwald/cmp_cox_sig.c @ 22:d8551fb39a5e default tip

Added tag v0.6 for changeset 1c4ccd635a68
author Peter Meerwald-Stadler <pmeerw@pmeerw.net>
date Sat, 28 Jan 2023 23:57:51 +0100
parents bd669312f068
children
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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1 #include "wm.h"
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2
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3 char *progname;
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4
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5 void usage(void) {
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6 fprintf(stderr, "usage: %s [-h] [-o file] [-v n] -s file file\n\n", progname);
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7 fprintf(stderr, "\t-h\t\tprint usage\n");
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8 fprintf(stderr, "\t-o file\t\toutput file\n");
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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9 fprintf(stderr, "\t-s file\t\toriginal signature file\n");
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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10 fprintf(stderr, "\t-v n\t\tverbosity level\n");
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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11 exit(0);
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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12 }
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13
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14 int main(int argc, char *argv[]) {
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15
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16 FILE *in = stdin;
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17 FILE *out = stdout;
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18 FILE *sig = NULL;
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19
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20 char signature_name[MAXPATHLEN];
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21 char output_name[MAXPATHLEN] = "(stdout)";
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22 char input_name[MAXPATHLEN] = "(stdin)";
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23
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24 int c;
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25 int sig_n, in_n;
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26 double sig_a;
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27 double sig_mean, sig_variance;
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28 double s1, s2, s3;
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29 char line[32];
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30
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31 int verbose = 0;
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32
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33 progname = argv[0];
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34
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35 while ((c = getopt(argc, argv, "h?o:s:v:")) != EOF) {
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36 switch (c) {
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37 case 'h':
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38 case '?':
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39 usage();
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40 break;
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41 case 'o':
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42 if ((out = fopen(optarg, "w")) == NULL) {
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43 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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44 exit(1);
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45 }
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46 strcpy(output_name, optarg);
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47 break;
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48 case 's':
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49 if ((sig = fopen(optarg, "r")) == NULL) {
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50 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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51 exit(1);
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52 }
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53 strcpy(signature_name, optarg);
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54 break;
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55 case 'v':
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56 verbose = atoi(optarg);
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57 if (verbose < 0) {
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58 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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59 exit(1);
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60 }
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61 break;
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62 }
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63 }
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64
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65 argc -= optind;
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66 argv += optind;
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67
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68 if (argc > 1) {
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69 usage();
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70 exit(1);
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71 }
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72
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73 if (argc == 1 && *argv[0] != '-') {
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74 if ((in = fopen(argv[0], "r")) == NULL) {
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75 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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76 exit(1);
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77 }
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78 else
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79 strcpy(input_name, argv[0]);
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80 }
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81
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82 if (!sig) {
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83 fprintf(stderr, "%s: original signature file not specified, use -s file option\n", progname);
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84 exit(1);
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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85 }
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86
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87 fgets(line, sizeof(line), sig);
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88 if (strspn(line, "CXSG") < 4) {
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89 fprintf(stderr, "%s: original signature file %s invalid\n", progname, signature_name);
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90 exit(1);
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91 }
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92
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93 fgets(line, sizeof(line), in);
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94 if (strspn(line, "CXWM") < 4) {
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95 fprintf(stderr, "%s: watermark file %s invalid\n", progname, input_name);
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96 exit(1);
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97 }
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98
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99 fscanf(sig, "%d\n", &sig_n);
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100 fscanf(in, "%d\n", &in_n);
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101 if (sig_n != in_n) {
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102 fprintf(stderr, "%s: watermark length mismatch (original %d, input %d)\n", progname, sig_n, in_n);
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103 exit(1);
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104 }
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105 if (sig_n <= 0 || sig_n > 32000) {
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106 fprintf(stderr, "%s: invalid original watermark length %d\n", progname, sig_n);
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107 exit(1);
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108 }
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109 if (in_n <= 0 || in_n > 32000) {
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110 fprintf(stderr, "%s: invalid watermark length %d\n", progname, in_n);
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111 exit(1);
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112 }
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113
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114 fscanf(sig, "%lf\n", &sig_a);
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115
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116 fscanf(sig, "%lf\n", &sig_mean);
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117 fscanf(sig, "%lf\n", &sig_variance);
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118
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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119 /*
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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120 * normalized correlation
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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121 * Craver, S., "Can Invisible Watermarks Resolve Rightful Ownership?", IBM Research Report, 1996, p. 5
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122 */
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123
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124 s1 = s2 = s3 = 0.0;
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125 while (in_n > 0) {
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126 double sig_x, in_x;
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127
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128 fscanf(sig, "%lf\n", &sig_x);
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129 fscanf(in, "%lf\n", &in_x);
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130
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131 if (verbose >= 1) {
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132 fprintf(stderr, "orig %f input %f\n", sig_x, in_x);
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133 }
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134
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135 s1 += sig_x * in_x;
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136 s2 += in_x * in_x;
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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137 s3 += sig_x * sig_x;
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138
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139 in_n--;
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140 }
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141
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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142 fprintf(out, "%f\n", s1 / sqrt(s2 * s3));
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143
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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144 fclose(sig);
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145 fclose(out);
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146 fclose(in);
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147
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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148 exit(0);
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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149 }

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