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comparison Meerwald-dir/wm_kund2_d.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/wm_kund2_d.c@bd669312f068
children
comparison
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23:71dd4b96221b 24:9f20bce6184e
1 #include "wm.h"
2 #include "signature.h"
3 #include "dwt.h"
4 #include "netpbm/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-a n\t\toverall embedding strength\n");
11 fprintf(stderr, "\t-e n\t\twavelet filtering method\n");
12 fprintf(stderr, "\t-f n\t\tfilter number\n");
13 fprintf(stderr, "\t-F file\t\tfilter definition file\n");
14 fprintf(stderr, "\t-h\t\tprint usage\n");
15 fprintf(stderr, "\t-l n\t\tembedding level\n");
16 fprintf(stderr, "\t-o file\t\textracted signature file\n");
17 fprintf(stderr, "\t-q n\t\tsignature strength\n");
18 fprintf(stderr, "\t-s file\t\toriginal signature file\n");
19 fprintf(stderr, "\t-v n\t\tverbosity level\n");
20 exit(0);
21 }
22
23 int main(int argc, char *argv[]) {
24
25 FILE *in = stdin;
26 FILE *out = stdout;
27 FILE *sig = NULL;
28
29 gray **input_image;
30
31 char signature_name[MAXPATHLEN];
32 char output_name[MAXPATHLEN] = "(stdout)";
33 char input_name[MAXPATHLEN] = "(stdin)";
34
35 int r, c;
36 int quality = 0;
37 int blocksize = 0;
38 int seed = 0;
39 int n = 0;
40 int method = -1;
41 int filter = 0;
42 char filter_name[MAXPATHLEN] = "";
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, "a:e:f:F:h?l:o:q:s:v:")) != EOF) {
63 switch (c) {
64 case 'a':
65 alpha = atof(optarg);
66 break;
67 case 'e':
68 method = atoi(optarg);
69 if (method < 0) {
70 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
71 exit(1);
72 }
73 break;
74 case 'f':
75 filter = atoi(optarg);
76 if (filter <= 0) {
77 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
78 exit(1);
79 }
80 break;
81 case 'F':
82 strcpy(filter_name, optarg);
83 break;
84 case 'h':
85 case '?':
86 usage();
87 break;
88 case 'l':
89 level = atoi(optarg);
90 if (level < 1) {
91 fprintf(stderr, "%s: embedding level out of range\n", progname);
92 exit(1);
93 }
94 break;
95 case 'o':
96 if ((out = fopen(optarg, "w")) == NULL) {
97 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
98 exit(1);
99 }
100 strcpy(output_name, optarg);
101 break;
102 case 'q':
103 quality = atoi(optarg);
104 if (quality < 1) {
105 fprintf(stderr, "%s: quality level %d out of range\n", progname, quality);
106 exit(1);
107 }
108 break;
109 case 's':
110 if ((sig = fopen(optarg, "r")) == NULL) {
111 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
112 exit(1);
113 }
114 strcpy(signature_name, optarg);
115 break;
116 case 'v':
117 verbose = atoi(optarg);
118 if (verbose < 0) {
119 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
120 exit(1);
121 }
122 break;
123 }
124 }
125
126 argc -= optind;
127 argv += optind;
128
129 if (argc > 1) {
130 usage();
131 exit(1);
132 }
133
134 if (argc == 1 && *argv[0] != '-') {
135 if ((in = fopen(argv[0], "rb")) == NULL) {
136 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
137 exit(1);
138 }
139 else
140 strcpy(input_name, argv[0]);
141 }
142
143 if (sig) {
144 char line[1024];
145 fgets(line, sizeof(line), sig);
146 if (strspn(line, "KD2SG") >= 5) {
147 fscanf(sig, "%d\n", &nbit_signature);
148 if (quality == 0)
149 fscanf(sig, "%d\n", &quality);
150 else
151 fscanf(sig, "%*d\n");
152 if (blocksize == 0)
153 fscanf(sig, "%d\n", &blocksize);
154 else
155 fscanf(sig, "%*d\n");
156 if (method < 0)
157 fscanf(sig, "%d\n", &method);
158 else
159 fscanf(sig, "%*d\n");
160 if (filter == 0)
161 fscanf(sig, "%d\n", &filter);
162 else
163 fscanf(sig, "%*d\n");
164 if (!strcmp(filter_name, ""))
165 fscanf(sig, "%[^\n\r]\n", filter_name);
166 else
167 fscanf(sig, "%*[^\n\r]\n");
168 if (level == 0)
169 fscanf(sig, "%d\n", &level);
170 else
171 fscanf(sig, "%*d\n");
172 fscanf(sig, "%d\n", &seed);
173 srandom(seed);
174 nbit_signature2 = nbit_signature;
175 n_signature = n_signature2 = NBITSTOBYTES(nbit_signature2);
176 binstr = malloc((nbit_signature2 + 1) * sizeof(char));
177 fscanf(sig, "%[01]\n", binstr);
178 binstr_to_sig2(binstr);
179 free(binstr);
180 init_signature_bits();
181 }
182 else {
183 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
184 exit(1);
185 }
186 fclose(sig);
187 }
188 else {
189 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
190 exit(1);
191 }
192
193 pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
194
195 cols = in_cols;
196 rows = in_rows;
197
198 if (verbose > 0)
199 fprintf(stderr, "%s: extracting %d bits with quality %d from\n"
200 " %d x %d host image, decomposition level %d\n",
201 progname, nbit_signature, quality, cols, rows, level);
202
203 input_image = pgm_allocarray(in_cols, in_rows);
204
205 for (row = 0; row < in_rows; row++)
206 pgm_readpgmrow(in, input_image[row], in_cols, in_maxval, in_format);
207
208 fclose(in);
209
210 init_dwt(cols, rows, filter_name, filter, level, method);
211 #ifdef POLLEN_STUFF
212 #include "pollen_stuff.c"
213 #endif
214 #ifdef PARAM_STUFF
215 #include "param_stuff.c"
216 #endif
217
218 fprintf(out, "KD2WM\n");
219 fprintf(out, "%d\n", nbit_signature);
220
221 dwts = fdwt(input_image);
222
223
224 p = dwts;
225
226 // consider each resolution level
227 while (p->coarse->level < level) {
228 int lwidth = p->vertical->image->width;
229 int lheight = p->vertical->image->height;
230 int bx, by;
231
232 for (bx = 0; bx < lwidth; bx += blocksize) {
233 for (by = 0; by < lheight; by += blocksize) {
234 int bw = MIN(bx + blocksize, lwidth);
235 int bh = MIN(by + blocksize, lheight);
236 int STEP;
237
238 // start to extracting watermark from beginning at each level
239 // get width and height of detail images at current level
240
241 if (verbose > 1)
242 fprintf(stderr, "%s: extracting at level %d now, size %d x %d\n",
243 progname, p->coarse->level, lwidth, lheight);
244
245 STEP = ROUND(alpha * (-15.555) + 10.777);
246 n = 0;
247 // consider each coefficient at resolution level
248 for (row = by; row < bh - STEP; row += STEP)
249 for (col = bx; col < bw - STEP; col += STEP) {
250 double h, v, d;
251 double *f1 = &h, *f2 = &v, *f3 = &d;
252 double delta;
253
254 // key-dependant coefficient selection
255 r = row + 1 + random() % (STEP-2);
256 c = col + 1 + random() % (STEP-2);
257
258 // get coefficient values, one from each detail image
259 h = get_pixel(p->horizontal->image, c, r);
260 v = get_pixel(p->vertical->image, c, r);
261 d = get_pixel(p->diagonal->image, c, r);
262
263 // order pointer to coefficient values such that f1 <= f2 <= f3
264 #define SWAP(A, B) {double *t = A; A = B; B = t;}
265 if (*f1 > *f2) SWAP(f1, f2);
266 if (*f2 > *f3) SWAP(f2, f3);
267 if (*f1 > *f2) SWAP(f1, f2);
268
269 // calculate delta, the width of the bins
270 delta = (*f3 - *f1) / (double) (2 * quality - 1);
271
272 // set middle coefficient to closest appropriate bin,
273 // according to watermark bit
274 if (quality == 1)
275 set_signature_bit(n, (*f3 - *f2) < (*f2 - *f1));
276 else {
277 double l = *f1;
278 int i = 0;
279 while ((l + delta) < *f2) {
280 l += delta;
281 i++;
282 }
283 if (i % 2)
284 set_signature_bit(n, (l + delta - *f2) > (*f2 - l));
285 else
286 set_signature_bit(n, (l + delta - *f2) < (*f2 - l));
287 }
288
289 if (verbose > 2)
290 fprintf(stderr, "%s: extracted bit #%d (= %d =? %d) at (%d/%d),\n"
291 " f1=%lf, f2=%lf, f3=%lf\n", progname, n,
292 get_signature_bit(n), get_signature2_bit(n),
293 c, r, *f1, *f2, *f3);
294 n++;
295 }
296
297 nbit_signature = n;
298 binstr = malloc(sizeof(char) * (nbit_signature + 1));
299 sig_to_binstr(binstr);
300 fprintf(out, "%d\n", nbit_signature);
301 fprintf(out, "%s\n", binstr);
302 free(binstr);
303
304 }
305 }
306 // descend one level
307 p = p->coarse;
308 }
309
310 fclose(out);
311
312 pgm_freearray(input_image, rows);
313
314 exit(0);
315 }

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