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comparison Meerwald/wm_kund2_e.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
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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] [-v n] -s file 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-l n\t\tembedding level\n");
15 fprintf(stderr, "\t-h\t\tprint usage\n");
16 fprintf(stderr, "\t-o file\t\toutput (watermarked) file\n");
17 fprintf(stderr, "\t-q n\t\tsignature strength (default 4)\n");
18 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\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 char output_name[MAXPATHLEN] = "(stdout)";
30 char input_name[MAXPATHLEN] = "(stdin)";
31 char signature_name[MAXPATHLEN];
32
33 char *binstr;
34
35 int r, c, n;
36 int row, col;
37
38 int quality = 0;
39 int blocksize = 0;
40 int filter = 0;
41 int method = -1;
42 int level = 0;
43 char filter_name[MAXPATHLEN] = "";
44
45 double alpha = 0.0;
46 int seed;
47 int verbose = 0;
48
49 gray **image;
50 Image_tree dwts, p;
51
52 gray maxval;
53 int rows, cols, colors, format;
54
55 progname = argv[0];
56
57 pgm_init(&argc, argv);
58 wm_init();
59
60 while ((c = getopt(argc, argv, "a:e:f:F:h?l:o:q:s:v:")) != EOF) {
61 switch (c) {
62 case 'a':
63 alpha = atof(optarg);
64 break;
65 case 'e':
66 method = atoi(optarg);
67 if (method < 0) {
68 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
69 exit(1);
70 }
71 break;
72 case 'f':
73 filter = atoi(optarg);
74 if (filter <= 0) {
75 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
76 exit(1);
77 }
78 break;
79 case 'F':
80 strcpy(filter_name, optarg);
81 break;
82 case 'h':
83 case '?':
84 usage();
85 break;
86 case 'l':
87 level = atoi(optarg);
88 if (level < 1) {
89 fprintf(stderr, "%s: embedding level out of range\n", progname);
90 exit(1);
91 }
92 break;
93 case 'o':
94 if ((out = fopen(optarg, "wb")) == NULL) {
95 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
96 exit(1);
97 }
98 strcpy(output_name, optarg);
99 break;
100 case 'q':
101 quality = atoi(optarg);
102 if (quality < 1) {
103 fprintf(stderr, "%s: quality factor %d out of range\n", progname, quality);
104 exit(1);
105 }
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 'v':
115 verbose = atoi(optarg);
116 if (verbose < 0) {
117 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
118 exit(1);
119 }
120 break;
121 }
122 }
123
124 argc -= optind;
125 argv += optind;
126
127 if (argc > 1) {
128 usage();
129 exit(1);
130 }
131
132 if (argc == 1 && *argv[0] != '-')
133 if ((in = fopen(argv[0], "rb")) == NULL) {
134 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
135 exit(1);
136 }
137 else
138 strcpy(input_name, argv[0]);
139
140 if (sig) {
141 char line[1024];
142 fgets(line, sizeof(line), sig);
143 if (strspn(line, "KD2SG") >= 5) {
144 fscanf(sig, "%d\n", &nbit_signature);
145 if (quality == 0)
146 fscanf(sig, "%d\n", &quality);
147 else
148 fscanf(sig, "%*d\n");
149 if (blocksize == 0)
150 fscanf(sig, "%d\n", &blocksize);
151 else
152 fscanf(sig, "%*d\n");
153 if (method < 0)
154 fscanf(sig, "%d\n", &method);
155 else
156 fscanf(sig, "%*d\n");
157 if (filter == 0)
158 fscanf(sig, "%d\n", &filter);
159 else
160 fscanf(sig, "%*d\n");
161 if (!strcmp(filter_name, ""))
162 fscanf(sig, "%[^\n\r]\n", &filter_name);
163 else
164 fscanf(sig, "%*[^\n\r]\n");
165 if (level == 0)
166 fscanf(sig, "%d\n", &level);
167 else
168 fscanf(sig, "%*d\n");
169 fscanf(sig, "%d\n", &seed);
170 srandom(seed);
171 n_signature = NBITSTOBYTES(nbit_signature);
172 binstr = malloc((nbit_signature + 1) * sizeof(char));
173 fscanf(sig, "%[01]\n", binstr);
174 binstr_to_sig(binstr);
175 free(binstr);
176 }
177 else {
178 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
179 exit(1);
180 }
181 fclose(sig);
182 }
183 else {
184 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
185 exit(1);
186 }
187
188 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
189
190 if (verbose > 0)
191 fprintf(stderr, "%s: embedding %d bits with quality %d in\n"
192 " %d x %d host image, up to decomposition level %d\n",
193 progname, nbit_signature, quality, cols, rows, level);
194
195 image = pgm_allocarray(cols, rows);
196
197 for (row = 0; row < rows; row++)
198 pgm_readpgmrow(in, image[row], cols, maxval, format);
199
200 fclose(in);
201
202 // decomposition of image
203 init_dwt(cols, rows, filter_name, filter, level, method);
204 #ifdef POLLEN_STUFF
205 #include "pollen_stuff.c"
206 #endif
207 #ifdef PARAM_STUFF
208 #include "param_stuff.c"
209 #endif
210
211 dwts = fdwt(image);
212
213 p = dwts;
214
215 // consider each resolution level
216 while (p->coarse->level < level) {
217 int lwidth = p->vertical->image->width;
218 int lheight = p->vertical->image->height;
219 int l = p->vertical->level;
220 int bx, by;
221 int nblock;
222 int bits_per_level;
223
224 nblock = 0;
225 bits_per_level = 0;
226 for (bx = 0; bx < lwidth; bx += blocksize) {
227 for (by = 0; by < lheight; by += blocksize) {
228 int bw = MIN(bx + blocksize, lwidth);
229 int bh = MIN(by + blocksize, lheight);
230 int STEP;
231 float MIN_DIFF;
232
233 // start to embed signature from beginning at each level
234 // get width and height of detail images at current level
235
236
237 if (verbose > 1)
238 fprintf(stderr, "%s: embedding at level %d now, block %d, size %d x %d at %d, %d\n",
239 progname, l, nblock, bw, bh, bx, by);
240
241 MIN_DIFF = ROUND(120.0 * alpha);
242 STEP = ROUND(alpha * (-15.555) + 10.777);
243 // fprintf(stderr, "XXX %d %f\n", STEP, MIN_DIFF);
244
245 n = 0;
246 // consider each coefficient at resolution level
247 for (row = by; row < bh - STEP; row += STEP)
248 for (col = bx; col < bw - STEP; col += STEP) {
249 double h, v, d;
250 double *f1 = &h, *f2 = &v, *f3 = &d;
251 double delta;
252
253 // key-dependant coefficient selection
254 r = row + 1+random() % (STEP-2);
255 c = col + 1+random() % (STEP-2);
256
257 // get coefficient values, one from each detail image
258 h = get_pixel(p->horizontal->image, c, r);
259 v = get_pixel(p->vertical->image, c, r);
260 d = get_pixel(p->diagonal->image, c, r);
261
262 // order pointer to coefficient values such that f1 <= f2 <= f3
263 #define SWAP(A, B) {double *t = A; A = B; B = t;}
264 if (*f1 > *f2) SWAP(f1, f2);
265 if (*f2 > *f3) SWAP(f2, f3);
266 if (*f1 > *f2) SWAP(f1, f2);
267
268 if (verbose > 2)
269 fprintf(stderr, "%s: embedding bit #%d (= %d) at (%d/%d),\n",
270 progname, n, get_signature_bit(n % nbit_signature), c, r);
271 if (verbose > 5)
272 fprintf(stderr, " h=%lf, v=%lf, d=%lf\n", h, v, d);
273 if (verbose > 2)
274 fprintf(stderr, " f1=%lf, f2=%lf", *f1, *f2);
275
276 if ((*f3 - *f1) < MIN_DIFF) {
277 double adj = (MIN_DIFF - (*f3 - *f1)) / 2.0;
278 *f1 -= adj;
279 *f3 += adj;
280 }
281
282 // calculate delta, the width of the bins
283 delta = (*f3 - *f1) / (double) (2 * quality - 1);
284
285 // set middle coefficient to closest appropriate bin,
286 // according to watermark bit
287 bits_per_level++;
288 if (quality == 1)
289 *f2 = get_signature_bit(n % nbit_signature) ? *f3 : *f1;
290 else {
291 double l = get_signature_bit(n % nbit_signature) ? *f1 + delta : *f1;
292 while ((l + 2 * delta) < *f2) l += 2 * delta;
293 *f2 = (*f2 - l) < (l + 2 * delta - *f2) ? l : l + 2 * delta;
294 }
295
296 if (verbose > 2)
297 fprintf(stderr, " -> %lf, f3=%lf\n", *f2, *f3);
298
299 // write pixels, one of them modified
300 set_pixel(p->horizontal->image, c, r, h);
301 set_pixel(p->vertical->image, c, r, v);
302 set_pixel(p->diagonal->image, c, r, d);
303
304 n++;
305
306 }
307 }
308 }
309
310 if (verbose > 1)
311 fprintf(stderr, "%s: embedded %d bits at level %d\n",
312 progname, bits_per_level, l);
313
314 // descend one level
315 p = p->coarse;
316 }
317
318 idwt(dwts, image);
319
320 pgm_writepgminit(out, cols, rows, maxval, 0);
321
322 for (row = 0; row < rows; row++)
323 pgm_writepgmrow(out, image[row], cols, maxval, 0);
324
325 fclose(out);
326
327 pgm_freearray(image, rows);
328
329 exit(0);
330 }

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