Mercurial > hg > wm

comparison Meerwald/gen_wang_sig.c @ 0:be303a3f5ea8

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
import
author Peter Meerwald <pmeerw@cosy.sbg.ac.at>
date Sun, 12 Aug 2007 13:14:34 +0200
parents
children f83ef905a63d
comparison
equal deleted inserted replaced
-1:000000000000 0:be303a3f5ea8
1 #include "wm.h"
2
3 char *progname;
4
5 void usage(void) {
6 fprintf(stderr, "usage: %s [-a n] [-b n] [-d n] [-e n] [-f n] [-F file] [-m n] [-n n] [-o file] [-s file] [-S n]\n\n", progname);
7 fprintf(stderr, "\t-a n\t\talpha factor (default 0.3)\n");
8 fprintf(stderr, "\t-b n\t\tbeta factor (default 1.0)\n");
9 fprintf(stderr, "\t-d n\t\tdeviation (default 1.0)\n");
10 fprintf(stderr, "\t-e n\t\twavelet filtering method (default 2)\n");
11 fprintf(stderr, "\t-f n\t\tfilter number (default 1)\n");
12 fprintf(stderr, "\t-F file\t\tfilter definition file (default 'filter.dat')\n");
13 fprintf(stderr, "\t-h\t\tprint usage\n");
14 fprintf(stderr, "\t-m n \t\tmean value (default 0.0)\n");
15 fprintf(stderr, "\t-n n\t\twatermark length (default 1000)\n");
16 fprintf(stderr, "\t-o file\t\toutput file\n");
17 fprintf(stderr, "\t-s file\t\tuse signature file's embedding information\n");
18 fprintf(stderr, "\t-S n\t\tseed\n");
19 exit(0);
20 }
21
22 int main(int argc, char *argv[]) {
23 FILE *out = stdout;
24 FILE *sig = NULL;
25
26 char output_name[MAXPATHLEN] = "(stdout)";
27 char signature_name[MAXPATHLEN];
28
29 int c;
30 int i;
31 int n = 1000;
32 int s = 0;
33 int e = 2;
34 int f = 1;
35 char F[MAXPATHLEN] = "filter.dat";
36 double a = 0.3;
37 double b = 1.0;
38 double m = 0.0;
39 double d = 1.0;
40
41 progname = argv[0];
42
43 while ((c = getopt(argc, argv, "a:b:d:e:f:F:h?m:n:o:s:S:")) != EOF) {
44 switch (c) {
45 case 'a':
46 a = atof(optarg);
47 if (a <= 0.0) {
48 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a);
49 exit(1);
50 }
51 break;
52 case 'b':
53 b = atof(optarg);
54 if (b <= 0.0) {
55 fprintf(stderr, "%s: beta factor %f out of range\n", progname, b);
56 exit(1);
57 }
58 break;
59 case 'd':
60 d = atof(optarg);
61 if (d <= 0.0) {
62 fprintf(stderr, "%s: deviation %f out of range\n", progname, d);
63 exit(1);
64 }
65 break;
66 case 'e':
67 e = atoi(optarg);
68 if (e < 0) {
69 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, e);
70 }
71 break;
72 case 'f':
73 f = atoi(optarg);
74 if (f <= 0) {
75 fprintf(stderr, "%s: filter number %d out of range\n", progname, f);
76 exit(1);
77 }
78 break;
79 case 'F':
80 strcpy(F, optarg);
81 break;
82 case 'h':
83 case '?':
84 usage();
85 break;
86 case 'm':
87 m = atof(optarg);
88 break;
89 case 'n':
90 n = atoi(optarg);
91 if (n < 1 || n > 32000) {
92 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
93 exit(1);
94 }
95 break;
96 case 'o':
97 if ((out = fopen(optarg, "w")) == NULL) {
98 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
99 exit(1);
100 }
101 strcpy(output_name, optarg);
102 break;
103 case 's':
104 if ((sig = fopen(optarg, "r")) == NULL) {
105 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
106 exit(1);
107 }
108 strcpy(signature_name, optarg);
109 break;
110 case 'S':
111 s = atoi(optarg);
112 break;
113 }
114 }
115
116 argc -= optind;
117 argv += optind;
118
119 if (argc > 0) {
120 usage();
121 exit(1);
122 }
123
124 if (sig) {
125 char line[32];
126 fgets(line, sizeof(line), sig);
127 if (strspn(line, "WGSG") >= 4) {
128 if (n == 0)
129 fscanf(sig, "%d\n", &n);
130 else
131 fscanf(sig, "%*d\n");
132 if (a == 0.0)
133 fscanf(sig, "%lf\n", &a);
134 else
135 fscanf(sig, "%*lf\n");
136 if (b == 0.0)
137 fscanf(sig, "%lf\n", &b);
138 else
139 fscanf(sig, "%*lf\n");
140 if (e < 0)
141 fscanf(sig, "%d\n", &e);
142 else
143 fscanf(sig, "%*d\n");
144 if (f == 0)
145 fscanf(sig, "%d\n", &f);
146 else
147 fscanf(sig, "%*d\n");
148 if (!strcmp(F, ""))
149 fscanf(sig, "%[^\n\r]\n", &F);
150 else
151 fscanf(sig, "%*[^\n\r]\n");
152 }
153 else {
154 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
155 exit(1);
156 }
157 }
158
159 if (s)
160 srandom(s);
161 else
162 srandom(time(NULL) * getpid());
163
164 fprintf(out, "WGSG\n");
165 fprintf(out, "%d\n", n);
166 fprintf(out, "%f\n", a);
167 fprintf(out, "%f\n", b);
168 fprintf(out, "%d\n", e);
169 fprintf(out, "%d\n", f);
170 fprintf(out, "%s\n", F);
171
172 n >>= 1;
173 while (n > 0) {
174 double x;
175 double x1, x2;
176
177 /*
178 * Algorithm P (Polar method for normal deviates),
179 * Knuth, D., "The Art of Computer Programming", Vol. 2, 3rd Edition, p. 122
180 */
181 do {
182 x1 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
183 x2 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
184 x = x1 * x1 + x2 * x2;
185 } while (x >= 1.0);
186 x1 *= sqrt((-2.0) * log(x) / x);
187 x2 *= sqrt((-2.0) * log(x) / x);
188
189 fprintf(out, "%f\n", m + d * x1);
190 fprintf(out, "%f\n", m + d * x2);
191
192 n--;
193 }
194
195 fclose(out);
196
197 exit(0);
198 }

Repositories maintained by Peter Meerwald, pmeerw@pmeerw.net.