Mercurial > hg > wm
annotate Meerwald-dir/cmp_wang_sig.c @ 24:9f20bce6184e v0.7
move directories, support netpbm 11
| author | Peter Meerwald-Stadler <pmeerw@pmeerw.net> |
|---|---|
| date | Fri, 20 Dec 2024 13:08:59 +0100 |
| parents | Meerwald/cmp_wang_sig.c@bd669312f068 |
| children |
| rev | line source |
|---|---|
| 0 | 1 #include "wm.h" |
| 2 | |
| 3 char *progname; | |
| 4 | |
| 5 void usage(void) { | |
|
20
bd669312f068
suppress warnings, fix link errors
Peter Meerwald-Stadler <pmeerw@pmeerw.net>
parents:
8
diff
changeset
|
6 fprintf(stderr, "usage: %s [-h] [-o file] [-v n] -s file file\n\n", progname); |
| 0 | 7 fprintf(stderr, "\t-h\t\tprint usage\n"); |
| 8 fprintf(stderr, "\t-o file\t\toutput file\n"); | |
| 9 fprintf(stderr, "\t-v n\t\tverbosity level\n"); | |
| 10 fprintf(stderr, "\t-s file\t\toriginal signature file\n"); | |
| 11 exit(0); | |
| 12 } | |
| 13 | |
| 14 int main(int argc, char *argv[]) { | |
| 15 | |
| 16 FILE *in = stdin; | |
| 17 FILE *out = stdout; | |
| 18 FILE *sig = NULL; | |
| 19 | |
| 20 char signature_name[MAXPATHLEN]; | |
| 21 char output_name[MAXPATHLEN] = "(stdout)"; | |
| 22 char input_name[MAXPATHLEN] = "(stdin)"; | |
| 23 | |
| 24 int c; | |
| 25 int sig_n, in_n; | |
| 26 double sig_a, sig_b; | |
| 27 int sig_e, sig_f; | |
| 28 double s1, s2, s3; | |
| 29 char line[32]; | |
| 30 | |
| 31 int verbose = 0; | |
| 32 | |
| 33 progname = argv[0]; | |
| 34 | |
|
20
bd669312f068
suppress warnings, fix link errors
Peter Meerwald-Stadler <pmeerw@pmeerw.net>
parents:
8
diff
changeset
|
35 while ((c = getopt(argc, argv, "h?o:s:v:")) != EOF) { |
| 0 | 36 switch (c) { |
| 37 case 'h': | |
| 38 case '?': | |
| 39 usage(); | |
| 40 break; | |
| 41 case 'o': | |
| 42 if ((out = fopen(optarg, "w")) == NULL) { | |
| 43 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg); | |
| 44 exit(1); | |
| 45 } | |
| 46 strcpy(output_name, optarg); | |
| 47 break; | |
| 48 case 's': | |
| 49 if ((sig = fopen(optarg, "r")) == NULL) { | |
| 50 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg); | |
| 51 exit(1); | |
| 52 } | |
| 53 strcpy(signature_name, optarg); | |
| 54 break; | |
| 55 case 'v': | |
| 56 verbose = atoi(optarg); | |
| 57 if (verbose < 0) { | |
| 58 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose); | |
| 59 exit(1); | |
| 60 } | |
| 61 break; | |
| 62 } | |
| 63 } | |
| 64 | |
| 65 argc -= optind; | |
| 66 argv += optind; | |
| 67 | |
| 68 if (argc > 1) { | |
| 69 usage(); | |
| 70 exit(1); | |
| 71 } | |
| 72 | |
| 8 | 73 if (argc == 1 && *argv[0] != '-') { |
| 0 | 74 if ((in = fopen(argv[0], "r")) == NULL) { |
| 75 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]); | |
| 76 exit(1); | |
| 77 } | |
| 78 else | |
| 79 strcpy(input_name, argv[0]); | |
| 8 | 80 } |
|
20
bd669312f068
suppress warnings, fix link errors
Peter Meerwald-Stadler <pmeerw@pmeerw.net>
parents:
8
diff
changeset
|
81 |
| 0 | 82 if (!sig) { |
| 83 fprintf(stderr, "%s: original signature file not specified, use -s file option\n", progname); | |
| 84 exit(1); | |
| 85 } | |
| 86 | |
| 87 fgets(line, sizeof(line), sig); | |
| 88 if (strspn(line, "WGSG") < 4) { | |
| 89 fprintf(stderr, "%s: original signature file %s invalid\n", progname, signature_name); | |
| 90 exit(1); | |
| 91 } | |
| 92 | |
| 93 fgets(line, sizeof(line), in); | |
| 94 if (strspn(line, "WGWM") < 4) { | |
| 95 fprintf(stderr, "%s: watermark file %s invalid\n", progname, input_name); | |
| 96 exit(1); | |
| 97 } | |
| 98 | |
| 99 fscanf(sig, "%d\n", &sig_n); | |
| 100 fscanf(in, "%d\n", &in_n); | |
| 101 if (sig_n != in_n) { | |
| 102 fprintf(stderr, "%s: watermark length mismatch (original %d, input %d)\n", progname, sig_n, in_n); | |
| 103 exit(1); | |
| 104 } | |
| 105 if (sig_n <= 0 || sig_n > 32000) { | |
| 106 fprintf(stderr, "%s: invalid original watermark length %d\n", progname, sig_n); | |
| 107 exit(1); | |
| 108 } | |
| 109 if (in_n != sig_n) { | |
| 110 fprintf(stderr, "%s: invalid watermark length %d, does not match signature length\n", progname, in_n); | |
| 111 exit(1); | |
| 112 } | |
| 113 | |
| 114 fscanf(sig, "%lf\n", &sig_a); | |
| 115 fscanf(sig, "%lf\n", &sig_b); | |
| 116 fscanf(sig, "%d\n", &sig_e); | |
| 117 fscanf(sig, "%d\n", &sig_f); | |
| 118 fscanf(sig, "%*[^\n\r]\n"); | |
| 119 | |
| 120 /* | |
| 121 * normalized correlation | |
| 122 * Craver, S., "Can Invisible Watermarks Resolve Rightful Ownership?", IBM Research Report, 1996, p. 5 | |
| 123 */ | |
| 124 | |
| 125 s1 = s2 = s3 = 0.0; | |
| 126 while (in_n > 0) { | |
| 127 double sig_x, in_x; | |
| 128 | |
| 129 fscanf(sig, "%lf\n", &sig_x); | |
| 130 fscanf(in, "%lf\n", &in_x); | |
| 131 | |
| 132 if (verbose >= 1) { | |
| 133 fprintf(stderr, "orig %f input %f\n", sig_x, in_x); | |
| 134 } | |
| 135 | |
| 136 s1 += sig_x * in_x; | |
| 137 s2 += in_x * in_x; | |
| 138 s3 += sig_x * sig_x; | |
| 139 | |
| 140 in_n--; | |
| 141 } | |
| 142 | |
| 143 fprintf(out, "%f\n", s1 / sqrt(s2 * s3)); | |
| 144 | |
| 145 fclose(sig); | |
| 146 fclose(out); | |
| 147 fclose(in); | |
| 148 | |
| 149 exit(0); | |
| 150 } |