Mercurial > hg > wm

comparison Meerwald-dir/gen_corvi_sig.c @ 24:9f20bce6184e v0.7

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move directories, support netpbm 11
author Peter Meerwald-Stadler <pmeerw@pmeerw.net>
date Fri, 20 Dec 2024 13:08:59 +0100
parents Meerwald/gen_corvi_sig.c@f83ef905a63d
children
comparison
equal deleted inserted replaced
23:71dd4b96221b 24:9f20bce6184e
1 #include "wm.h"
2
3 char *progname;
4
5 void usage(void) {
6 fprintf(stderr, "usage: %s [-a n] [-d n] [-e n] [-f n] [-F file] [-m n] [-n n] [-o file] [-s n]\n\n", progname);
7 fprintf(stderr, "\t-a n\t\talpha factor (default 0.1)\n");
8 fprintf(stderr, "\t-d n\t\tdeviation (default 1.0)\n");
9 fprintf(stderr, "\t-e n\t\twavelet filtering method (default 2)\n");
10 fprintf(stderr, "\t-f n\t\tfilter number (default 1)\n");
11 fprintf(stderr, "\t-F file\t\tfilter definition file (default 'filter.dat')\n");
12 fprintf(stderr, "\t-h\t\tprint usage\n");
13 fprintf(stderr, "\t-m n \t\tmean value (default 0.0)\n");
14 fprintf(stderr, "\t-n n\t\twatermark length (default 1000)\n");
15 fprintf(stderr, "\t-o file\t\toutput file\n");
16 fprintf(stderr, "\t-s n\t\tseed\n");
17 exit(0);
18 }
19
20 int main(int argc, char *argv[]) {
21 FILE *out = stdout;
22
23 char output_name[MAXPATHLEN] = "(stdout)";
24
25 int c;
26 int n = 1000;
27 int s = 0;
28 int e = 2;
29 int f = 1;
30 char F[MAXPATHLEN] = "filter.dat";
31 double a = 0.1;
32 double m = 0.0;
33 double d = 1.0;
34
35 progname = argv[0];
36
37 while ((c = getopt(argc, argv, "a:d:e:f:F:h?m:n:o:s:")) != EOF) {
38 switch (c) {
39 case 'a':
40 a = atof(optarg);
41 if (a <= 0.0) {
42 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a);
43 exit(1);
44 }
45 break;
46 case 'd':
47 d = atof(optarg);
48 if (d <= 0.0) {
49 fprintf(stderr, "%s: deviation %f out of range\n", progname, d);
50 exit(1);
51 }
52 break;
53 case 'e':
54 e = atoi(optarg);
55 if (e < 0) {
56 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, e);
57 }
58 break;
59 case 'f':
60 f = atoi(optarg);
61 if (f <= 0) {
62 fprintf(stderr, "%s: filter number %d out of range\n", progname, f);
63 exit(1);
64 }
65 break;
66 case 'F':
67 strcpy(F, optarg);
68 break;
69 case 'h':
70 case '?':
71 usage();
72 break;
73 case 'm':
74 m = atof(optarg);
75 break;
76 case 'n':
77 n = atoi(optarg);
78 if (n < 1 || n > 32000) {
79 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
80 exit(1);
81 }
82 break;
83 case 'o':
84 if ((out = fopen(optarg, "w")) == NULL) {
85 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
86 exit(1);
87 }
88 strcpy(output_name, optarg);
89 break;
90 case 's':
91 s = atoi(optarg);
92 break;
93 }
94 }
95
96 argc -= optind;
97 argv += optind;
98
99 if (argc > 0) {
100 usage();
101 exit(1);
102 }
103
104 if (s)
105 srandom(s);
106 else
107 srandom(time(NULL) * getpid());
108
109 fprintf(out, "CVSG\n");
110 fprintf(out, "%d\n", n);
111 fprintf(out, "%f\n", a);
112 fprintf(out, "%d\n", e);
113 fprintf(out, "%d\n", f);
114 fprintf(out, "%s\n", F);
115
116 n >>= 1;
117 while (n > 0) {
118 double x;
119 double x1, x2;
120
121 /*
122 * Algorithm P (Polar method for normal deviates),
123 * Knuth, D., "The Art of Computer Programming", Vol. 2, 3rd Edition, p. 122
124 */
125 do {
126 x1 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
127 x2 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
128 x = x1 * x1 + x2 * x2;
129 } while (x >= 1.0);
130 x1 *= sqrt((-2.0) * log(x) / x);
131 x2 *= sqrt((-2.0) * log(x) / x);
132
133 fprintf(out, "%f\n", m + d * x1);
134 fprintf(out, "%f\n", m + d * x2);
135
136 n--;
137 }
138
139 fclose(out);
140
141 exit(0);
142 }

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