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comparison Meerwald/wm_kund3_d.c @ 3:acb6967ee76d

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update to 0.5
author Peter Meerwald <pmeerw@cosy.sbg.ac.at>
date Tue, 14 Aug 2007 21:11:21 +0200
parents
children f83ef905a63d
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2:b92f06d9a967 3:acb6967ee76d
1 #include "wm.h"
2 #include "signature.h"
3 #include "dwt.h"
4 #include "pgm.h"
5
6 char *progname;
7
8 void usage(void) {
9 fprintf(stderr, "usage: %s [-e n] [-f n] [-F n] [-h] [-l n] [-o file] [-q n] [-s file] [-v n] file\n\n", progname);
10 fprintf(stderr, "\t-e n\t\twavelet filtering method\n");
11 fprintf(stderr, "\t-f n\t\tfilter number\n");
12 fprintf(stderr, "\t-F file\t\tfilter definition file\n");
13 fprintf(stderr, "\t-h\t\tprint usage\n");
14 fprintf(stderr, "\t-l n\t\tembedding level\n");
15 fprintf(stderr, "\t-o file\t\textracted signature file\n");
16 fprintf(stderr, "\t-q n\t\tsignature strength\n");
17 fprintf(stderr, "\t-s file\t\toriginal signature file\n");
18 fprintf(stderr, "\t-v n\t\tverbosity level\n");
19 exit(0);
20 }
21
22 int main(int argc, char *argv[]) {
23
24 FILE *in = stdin;
25 FILE *out = stdout;
26 FILE *sig = NULL;
27
28 gray **input_image;
29
30 char signature_name[MAXPATHLEN];
31 char output_name[MAXPATHLEN] = "(stdout)";
32 char input_name[MAXPATHLEN] = "(stdin)";
33
34 int r, c;
35 int i;
36 int quality = 0;
37 int seed = 0;
38 int n = 0;
39 int method = -1;
40 int filter = 0;
41 char filter_name[MAXPATHLEN] = "";
42
43 char *binstr;
44
45 int level = 0;
46 double alpha = 0.0;
47
48 int in_rows, in_cols, in_format;
49 gray in_maxval;
50 int rows, cols;
51 int row, col;
52
53 Image_tree dwts, p;
54
55 int verbose = 0;
56
57 progname = argv[0];
58
59 pgm_init(&argc, argv);
60 wm_init();
61
62 while ((c = getopt(argc, argv, "e:f:F:h?l:o:q:s:v:")) != EOF) {
63 switch (c) {
64 case 'e':
65 method = atoi(optarg);
66 if (method < 0) {
67 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
68 exit(1);
69 }
70 break;
71 case 'f':
72 filter = atoi(optarg);
73 if (filter <= 0) {
74 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
75 exit(1);
76 }
77 break;
78 case 'F':
79 strcpy(filter_name, optarg);
80 break;
81 case 'h':
82 case '?':
83 usage();
84 break;
85 case 'l':
86 level = atoi(optarg);
87 if (level < 1) {
88 fprintf(stderr, "%s: embedding level out of range\n", progname);
89 exit(1);
90 }
91 break;
92 case 'o':
93 if ((out = fopen(optarg, "w")) == NULL) {
94 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
95 exit(1);
96 }
97 strcpy(output_name, optarg);
98 break;
99 case 'q':
100 quality = atoi(optarg);
101 if (quality < 1) {
102 fprintf(stderr, "%s: quality level %d out of range\n", progname, quality);
103 exit(1);
104 }
105 break;
106 case 's':
107 if ((sig = fopen(optarg, "r")) == NULL) {
108 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
109 exit(1);
110 }
111 strcpy(signature_name, optarg);
112 break;
113 case 'v':
114 verbose = atoi(optarg);
115 if (verbose < 0) {
116 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
117 exit(1);
118 }
119 break;
120 }
121 }
122
123 argc -= optind;
124 argv += optind;
125
126 if (argc > 1) {
127 usage();
128 exit(1);
129 }
130
131 if (argc == 1 && *argv[0] != '-')
132 if ((in = fopen(argv[0], "rb")) == NULL) {
133 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
134 exit(1);
135 }
136 else
137 strcpy(input_name, argv[0]);
138
139 if (sig) {
140 char line[32];
141 fgets(line, sizeof(line), sig);
142 if (strspn(line, "KD3SG") >= 5) {
143 fscanf(sig, "%d\n", &nbit_signature);
144 if (quality == 0)
145 fscanf(sig, "%d\n", &quality);
146 else
147 fscanf(sig, "%*d\n");
148 if (method < 0)
149 fscanf(sig, "%d\n", &method);
150 else
151 fscanf(sig, "%*d\n");
152 if (filter == 0)
153 fscanf(sig, "%d\n", &filter);
154 else
155 fscanf(sig, "%*d\n");
156 if (!strcmp(filter_name, ""))
157 fscanf(sig, "%[^\n\r]\n", &filter_name);
158 else
159 fscanf(sig, "%*[^\n\r]\n");
160 if (level == 0)
161 fscanf(sig, "%d\n", &level);
162 else
163 fscanf(sig, "%*d\n");
164 fscanf(sig, "%d\n", &seed);
165 srandom(seed);
166 nbit_signature2 = nbit_signature;
167 n_signature = n_signature2 = NBITSTOBYTES(nbit_signature2);
168 binstr = malloc((nbit_signature2 + 1) * sizeof(char));
169 fscanf(sig, "%[01]\n", binstr);
170 binstr_to_sig2(binstr);
171 free(binstr);
172 init_signature_bits();
173 }
174 else {
175 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
176 exit(1);
177 }
178 fclose(sig);
179 }
180 else {
181 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
182 exit(1);
183 }
184
185 pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
186
187 cols = in_cols;
188 rows = in_rows;
189
190 if (verbose > 0)
191 fprintf(stderr, "%s: extracting %d bits with quality %d from\n"
192 " %d x %d host image, decomposition level %d\n",
193 progname, nbit_signature, quality, cols, rows, level);
194
195 input_image = pgm_allocarray(in_cols, in_rows);
196
197 for (row = 0; row < in_rows; row++)
198 pgm_readpgmrow(in, input_image[row], in_cols, in_maxval, in_format);
199
200 fclose(in);
201
202 init_dwt(cols, rows, filter_name, filter, level, method);
203 /*#ifdef POLLEN_STUFF
204 #include "pollen_stuff.c"
205 #endif
206 #ifdef PARAM_STUFF
207 #include "param_stuff.c"
208 #endif*/
209
210 dwts = fdwt(input_image);
211
212 p = dwts;
213
214 #define STEP 3
215
216 // consider each resolution level
217 while (p->coarse->level < level)
218 // descend one level
219 p = p->coarse;
220
221 // start to extracting watermark from beginning at each level
222 {
223 // get width and height of detail images at current level
224 int lwidth = p->vertical->image->width;
225 int lheight = p->vertical->image->height;
226
227 if (verbose > 1)
228 fprintf(stderr, "%s: extracting at level %d now, size %d x %d\n",
229 progname, p->coarse->level, lwidth, lheight);
230
231 // consider each coefficient at resolution level
232 for (row = 0; row < lwidth - STEP; row += STEP)
233 for (col = 0; col < lheight - STEP; col += STEP) {
234 double h, v, d;
235 double *f1 = &h, *f2 = &v, *f3 = &d;
236 double delta;
237
238 // key-dependant coefficient selection
239 r = row + 1 + random() % (STEP-2);
240 c = col + 1 + random() % (STEP-2);
241
242 // get coefficient values, one from each detail image
243 h = get_pixel(p->horizontal->image, c, r);
244 v = get_pixel(p->vertical->image, c, r);
245 d = get_pixel(p->diagonal->image, c, r);
246
247 // order pointer to coefficient values such that f1 <= f2 <= f3
248 #define SWAP(A, B) {double *t = A; A = B; B = t;}
249 if (*f1 > *f2) SWAP(f1, f2);
250 if (*f2 > *f3) SWAP(f2, f3);
251 if (*f1 > *f2) SWAP(f1, f2);
252
253 // calculate delta, the width of the bins
254 delta = (*f3 - *f1) / (double) (2 * quality - 1);
255
256 // set middle coefficient to closest appropriate bin,
257 // according to watermark bit
258 if (quality == 1)
259 set_signature_bit(n, (*f3 - *f2) < (*f2 - *f1));
260 else {
261 double l = *f1;
262 int i = 0;
263 while ((l + delta) < *f2) {
264 l += delta;
265 i++;
266 }
267 if (i % 2)
268 set_signature_bit(n, (l + delta - *f2) > (*f2 - l));
269 else
270 set_signature_bit(n, (l + delta - *f2) < (*f2 - l));
271 }
272
273 if (verbose > 2)
274 fprintf(stderr, "%s: extracted bit #%d (= %d =? %d) at (%d/%d),\n"
275 " f1=%lf, f2=%lf, f3=%lf\n", progname, n,
276 get_signature_bit(n), get_signature2_bit(n),
277 c, r, *f1, *f2, *f3);
278 n++;
279 }
280 }
281
282 fprintf(out, "KD3WM\n");
283 fprintf(out, "%d\n", n);
284 nbit_signature = n;
285 binstr = malloc(sizeof(char) * (nbit_signature + 1));
286 sig_to_binstr(binstr);
287 fprintf(out, "%s\n", binstr);
288 free(binstr);
289 fclose(out);
290
291 pgm_freearray(input_image, rows);
292
293 exit(0);
294 }

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