Mercurial > hg > wm

comparison Meerwald-dir/gen_dugad_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_dugad_sig.c@4987db85cfae
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] [-e n] [-f n] [-F file] [-l n] [-n n] [-o file] [-s file] [-S n] [-t n] [-T n]\n\n", progname);
7 fprintf(stderr, "\t-a n\t\talpha factor (default 0.2)\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-l n\t\tdecomposition levels (default 3)\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\tsignature to embed in input image\n");
18 fprintf(stderr, "\t-S n\t\tseed\n");
19 fprintf(stderr, "\t-t n\t\tcasting threshold (default 40.0)\n");
20 fprintf(stderr, "\t-T n\t\tdetection threshold (default 50.0)\n");
21 exit(0);
22 }
23
24 int main(int argc, char *argv[]) {
25 FILE *out = stdout;
26 FILE *sig = NULL;
27
28 char output_name[MAXPATHLEN] = "(stdout)";
29 char signature_name[MAXPATHLEN];
30
31 int c;
32 int n = 1000;
33 int s = 0;
34 int e = 2;
35 int f = 1;
36 int l = 3;
37 char F[MAXPATHLEN] = "filter.dat";
38 double a = 0.2;
39 double t1 = 40.0;
40 double t2 = 50.0;
41 double m = 0.0;
42 double d = 1.0;
43
44 progname = argv[0];
45
46 while ((c = getopt(argc, argv, "a:b:d:e:f:F:h?l:m:n:o:s:S:t:T:")) != EOF) {
47 switch (c) {
48 case 'a':
49 a = atof(optarg);
50 if (a <= 0.0) {
51 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a);
52 exit(1);
53 }
54 break;
55 case 'd':
56 d = atof(optarg);
57 if (d <= 0.0) {
58 fprintf(stderr, "%s: deviation %f out of range\n", progname, d);
59 exit(1);
60 }
61 break;
62
63 case 'e':
64 e = atoi(optarg);
65 if (e < 0) {
66 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, e);
67 }
68 break;
69 case 'f':
70 f = atoi(optarg);
71 if (f <= 0) {
72 fprintf(stderr, "%s: filter number %d out of range\n", progname, f);
73 exit(1);
74 }
75 break;
76 case 'F':
77 strcpy(F, optarg);
78 break;
79 case 'h':
80 case '?':
81 usage();
82 break;
83 case 'l':
84 l = atoi(optarg);
85 if (l <= 0) {
86 fprintf(stderr, "%s: decomposition level %d out of range\n", progname, l);
87 exit(1);
88 }
89 break;
90 case 'm':
91 m = atof(optarg);
92 break;
93 case 'n':
94 n = atoi(optarg);
95 if (n < 1 || n > 32000) {
96 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
97 exit(1);
98 }
99 break;
100 case 'o':
101 if ((out = fopen(optarg, "w")) == NULL) {
102 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
103 exit(1);
104 }
105 strcpy(output_name, optarg);
106 break;
107 case 's':
108 if ((sig = fopen(optarg, "r")) == NULL) {
109 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
110 exit(1);
111 }
112 strcpy(signature_name, optarg);
113 break;
114 case 'S':
115 s = atoi(optarg);
116 break;
117 case 't':
118 t1 = atof(optarg);
119 if (t1 <= 0.0) {
120 fprintf(stderr, "%s: casting threshold %f out of range\n", progname, t1);
121 exit(1);
122 }
123 break;
124 case 'T':
125 t2 = atof(optarg);
126 if (t2 <= 0.0) {
127 fprintf(stderr, "%s: detection threshold %f out of range\n", progname, t2);
128 exit(1);
129 }
130 break;
131 }
132 }
133
134 argc -= optind;
135 argv += optind;
136
137 if (argc > 0) {
138 usage();
139 exit(1);
140 }
141
142 if (sig) {
143 char line[32];
144 fgets(line, sizeof(line), sig);
145 if (strspn(line, "DGSG") >= 4) {
146 if (n == 0)
147 fscanf(sig, "%d\n", &n);
148 else
149 fscanf(sig, "%*d\n");
150 if (l == 0)
151 fscanf(sig, "%d\n", &l);
152 else
153 fscanf(sig, "%*d\n");
154 if (a == 0.0)
155 fscanf(sig, "%lf\n", &a);
156 else
157 fscanf(sig, "%*f\n");
158 if (t1 == 0.0)
159 fscanf(sig, "%lf\n", &t1);
160 else
161 fscanf(sig, "%*f\n");
162 if (t2 == 0.0)
163 fscanf(sig, "%lf\n", &t2);
164 else
165 fscanf(sig, "%*f\n");
166 if (e < 0)
167 fscanf(sig, "%d\n", &e);
168 else
169 fscanf(sig, "%*d\n");
170 if (f == 0)
171 fscanf(sig, "%d\n", &f);
172 else
173 fscanf(sig, "%*d\n");
174 if (!strcmp(F, ""))
175 fscanf(sig, "%[^\n\r]\n", F);
176 else
177 fscanf(sig, "%*[^\n\r]\n");
178 }
179 else {
180 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
181 exit(1);
182 }
183 }
184
185 if (s)
186 srandom(s);
187 else
188 srandom(time(NULL) * getpid());
189
190 fprintf(out, "DGSG\n");
191 fprintf(out, "%d\n", n);
192 fprintf(out, "%d\n", l);
193 fprintf(out, "%f\n", a);
194 fprintf(out, "%f\n", t1);
195 fprintf(out, "%f\n", t2);
196 fprintf(out, "%d\n", e);
197 fprintf(out, "%d\n", f);
198 fprintf(out, "%s\n", F);
199
200 n >>= 1;
201 while (n > 0) {
202 double x;
203 double x1, x2;
204
205 /*
206 * Algorithm P (Polar method for normal deviates),
207 * Knuth, D., "The Art of Computer Programming", Vol. 2, 3rd Edition, p. 122
208 */
209 do {
210 x1 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
211 x2 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
212 x = x1 * x1 + x2 * x2;
213 } while (x >= 1.0);
214 x1 *= sqrt((-2.0) * log(x) / x);
215 x2 *= sqrt((-2.0) * log(x) / x);
216
217 fprintf(out, "%f\n", m + d * x1);
218 fprintf(out, "%f\n", m + d * x2);
219
220 n--;
221 }
222
223 fclose(out);
224
225 exit(0);
226 }

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