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comparison Meerwald-dir/wm_kund2_e.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_e.c@ad1d224896c5
children
comparison
equal deleted inserted replaced
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] [-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, 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
141 if (sig) {
142 char line[1024];
143 fgets(line, sizeof(line), sig);
144 if (strspn(line, "KD2SG") >= 5) {
145 fscanf(sig, "%d\n", &nbit_signature);
146 if (quality == 0)
147 fscanf(sig, "%d\n", &quality);
148 else
149 fscanf(sig, "%*d\n");
150 if (blocksize == 0)
151 fscanf(sig, "%d\n", &blocksize);
152 else
153 fscanf(sig, "%*d\n");
154 if (method < 0)
155 fscanf(sig, "%d\n", &method);
156 else
157 fscanf(sig, "%*d\n");
158 if (filter == 0)
159 fscanf(sig, "%d\n", &filter);
160 else
161 fscanf(sig, "%*d\n");
162 if (!strcmp(filter_name, ""))
163 fscanf(sig, "%[^\n\r]\n", filter_name);
164 else
165 fscanf(sig, "%*[^\n\r]\n");
166 if (level == 0)
167 fscanf(sig, "%d\n", &level);
168 else
169 fscanf(sig, "%*d\n");
170 fscanf(sig, "%d\n", &seed);
171 srandom(seed);
172 n_signature = NBITSTOBYTES(nbit_signature);
173 binstr = malloc((nbit_signature + 1) * sizeof(char));
174 fscanf(sig, "%[01]\n", binstr);
175 binstr_to_sig(binstr);
176 free(binstr);
177 }
178 else {
179 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
180 exit(1);
181 }
182 fclose(sig);
183 }
184 else {
185 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
186 exit(1);
187 }
188
189 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
190
191 if (verbose > 0)
192 fprintf(stderr, "%s: embedding %d bits with quality %d in\n"
193 " %d x %d host image, up to decomposition level %d\n",
194 progname, nbit_signature, quality, cols, rows, level);
195
196 image = pgm_allocarray(cols, rows);
197
198 for (row = 0; row < rows; row++)
199 pgm_readpgmrow(in, image[row], cols, maxval, format);
200
201 fclose(in);
202
203 // decomposition of image
204 init_dwt(cols, rows, filter_name, filter, level, method);
205 #ifdef POLLEN_STUFF
206 #include "pollen_stuff.c"
207 #endif
208 #ifdef PARAM_STUFF
209 #include "param_stuff.c"
210 #endif
211
212 dwts = fdwt(image);
213
214 p = dwts;
215
216 // consider each resolution level
217 while (p->coarse->level < level) {
218 int lwidth = p->vertical->image->width;
219 int lheight = p->vertical->image->height;
220 int l = p->vertical->level;
221 int bx, by;
222 int nblock;
223 int bits_per_level;
224
225 nblock = 0;
226 bits_per_level = 0;
227 for (bx = 0; bx < lwidth; bx += blocksize) {
228 for (by = 0; by < lheight; by += blocksize) {
229 int bw = MIN(bx + blocksize, lwidth);
230 int bh = MIN(by + blocksize, lheight);
231 int STEP;
232 float MIN_DIFF;
233
234 // start to embed signature from beginning at each level
235 // get width and height of detail images at current level
236
237
238 if (verbose > 1)
239 fprintf(stderr, "%s: embedding at level %d now, block %d, size %d x %d at %d, %d\n",
240 progname, l, nblock, bw, bh, bx, by);
241
242 MIN_DIFF = ROUND(120.0 * alpha);
243 STEP = ROUND(alpha * (-15.555) + 10.777);
244 // fprintf(stderr, "XXX %d %f\n", STEP, MIN_DIFF);
245
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 if (verbose > 2)
270 fprintf(stderr, "%s: embedding bit #%d (= %d) at (%d/%d),\n",
271 progname, n, get_signature_bit(n % nbit_signature), c, r);
272 if (verbose > 5)
273 fprintf(stderr, " h=%lf, v=%lf, d=%lf\n", h, v, d);
274 if (verbose > 2)
275 fprintf(stderr, " f1=%lf, f2=%lf", *f1, *f2);
276
277 if ((*f3 - *f1) < MIN_DIFF) {
278 double adj = (MIN_DIFF - (*f3 - *f1)) / 2.0;
279 *f1 -= adj;
280 *f3 += adj;
281 }
282
283 // calculate delta, the width of the bins
284 delta = (*f3 - *f1) / (double) (2 * quality - 1);
285
286 // set middle coefficient to closest appropriate bin,
287 // according to watermark bit
288 bits_per_level++;
289 if (quality == 1)
290 *f2 = get_signature_bit(n % nbit_signature) ? *f3 : *f1;
291 else {
292 double l = get_signature_bit(n % nbit_signature) ? *f1 + delta : *f1;
293 while ((l + 2 * delta) < *f2) l += 2 * delta;
294 *f2 = (*f2 - l) < (l + 2 * delta - *f2) ? l : l + 2 * delta;
295 }
296
297 if (verbose > 2)
298 fprintf(stderr, " -> %lf, f3=%lf\n", *f2, *f3);
299
300 // write pixels, one of them modified
301 set_pixel(p->horizontal->image, c, r, h);
302 set_pixel(p->vertical->image, c, r, v);
303 set_pixel(p->diagonal->image, c, r, d);
304
305 n++;
306
307 }
308 }
309 }
310
311 if (verbose > 1)
312 fprintf(stderr, "%s: embedded %d bits at level %d\n",
313 progname, bits_per_level, l);
314
315 // descend one level
316 p = p->coarse;
317 }
318
319 idwt(dwts, image);
320
321 pgm_writepgminit(out, cols, rows, maxval, 0);
322
323 for (row = 0; row < rows; row++)
324 pgm_writepgmrow(out, image[row], cols, maxval, 0);
325
326 fclose(out);
327
328 pgm_freearray(image, rows);
329
330 exit(0);
331 }

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