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comparison Meerwald-dir/wm_kund3_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_kund3_d.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] [-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 quality = 0;
36 int seed = 0;
37 int n = 0;
38 int method = -1;
39 int filter = 0;
40 char filter_name[MAXPATHLEN] = "";
41
42 char *binstr;
43
44 int level = 0;
45
46 int in_rows, in_cols, in_format;
47 gray in_maxval;
48 int rows, cols;
49 int row, col;
50
51 Image_tree dwts, p;
52
53 int verbose = 0;
54
55 progname = argv[0];
56
57 pgm_init(&argc, argv);
58 wm_init();
59
60 while ((c = getopt(argc, argv, "e:f:F:h?l:o:q:s:v:")) != EOF) {
61 switch (c) {
62 case 'e':
63 method = atoi(optarg);
64 if (method < 0) {
65 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
66 exit(1);
67 }
68 break;
69 case 'f':
70 filter = atoi(optarg);
71 if (filter <= 0) {
72 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
73 exit(1);
74 }
75 break;
76 case 'F':
77 strcpy(filter_name, optarg);
78 break;
79 case 'h':
80 case '?':
81 usage();
82 break;
83 case 'l':
84 level = atoi(optarg);
85 if (level < 1) {
86 fprintf(stderr, "%s: embedding level out of range\n", progname);
87 exit(1);
88 }
89 break;
90 case 'o':
91 if ((out = fopen(optarg, "w")) == NULL) {
92 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
93 exit(1);
94 }
95 strcpy(output_name, optarg);
96 break;
97 case 'q':
98 quality = atoi(optarg);
99 if (quality < 1) {
100 fprintf(stderr, "%s: quality level %d out of range\n", progname, quality);
101 exit(1);
102 }
103 break;
104 case 's':
105 if ((sig = fopen(optarg, "r")) == NULL) {
106 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
107 exit(1);
108 }
109 strcpy(signature_name, optarg);
110 break;
111 case 'v':
112 verbose = atoi(optarg);
113 if (verbose < 0) {
114 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
115 exit(1);
116 }
117 break;
118 }
119 }
120
121 argc -= optind;
122 argv += optind;
123
124 if (argc > 1) {
125 usage();
126 exit(1);
127 }
128
129 if (argc == 1 && *argv[0] != '-') {
130 if ((in = fopen(argv[0], "rb")) == NULL) {
131 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
132 exit(1);
133 }
134 else
135 strcpy(input_name, argv[0]);
136 }
137
138 if (sig) {
139 char line[32];
140 fgets(line, sizeof(line), sig);
141 if (strspn(line, "KD3SG") >= 5) {
142 fscanf(sig, "%d\n", &nbit_signature);
143 if (quality == 0)
144 fscanf(sig, "%d\n", &quality);
145 else
146 fscanf(sig, "%*d\n");
147 if (method < 0)
148 fscanf(sig, "%d\n", &method);
149 else
150 fscanf(sig, "%*d\n");
151 if (filter == 0)
152 fscanf(sig, "%d\n", &filter);
153 else
154 fscanf(sig, "%*d\n");
155 if (!strcmp(filter_name, ""))
156 fscanf(sig, "%[^\n\r]\n", filter_name);
157 else
158 fscanf(sig, "%*[^\n\r]\n");
159 if (level == 0)
160 fscanf(sig, "%d\n", &level);
161 else
162 fscanf(sig, "%*d\n");
163 fscanf(sig, "%d\n", &seed);
164 srandom(seed);
165 nbit_signature2 = nbit_signature;
166 n_signature = n_signature2 = NBITSTOBYTES(nbit_signature2);
167 binstr = malloc((nbit_signature2 + 1) * sizeof(char));
168 fscanf(sig, "%[01]\n", binstr);
169 binstr_to_sig2(binstr);
170 free(binstr);
171 init_signature_bits();
172 }
173 else {
174 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
175 exit(1);
176 }
177 fclose(sig);
178 }
179 else {
180 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
181 exit(1);
182 }
183
184 pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
185
186 cols = in_cols;
187 rows = in_rows;
188
189 if (verbose > 0)
190 fprintf(stderr, "%s: extracting %d bits with quality %d from\n"
191 " %d x %d host image, decomposition level %d\n",
192 progname, nbit_signature, quality, cols, rows, level);
193
194 input_image = pgm_allocarray(in_cols, in_rows);
195
196 for (row = 0; row < in_rows; row++)
197 pgm_readpgmrow(in, input_image[row], in_cols, in_maxval, in_format);
198
199 fclose(in);
200
201 init_dwt(cols, rows, filter_name, filter, level, method);
202 /*#ifdef POLLEN_STUFF
203 #include "pollen_stuff.c"
204 #endif
205 #ifdef PARAM_STUFF
206 #include "param_stuff.c"
207 #endif*/
208
209 dwts = fdwt(input_image);
210
211 p = dwts;
212
213 #define STEP 3
214
215 // consider each resolution level
216 while (p->coarse->level < level)
217 // descend one level
218 p = p->coarse;
219
220 // start to extracting watermark from beginning at each level
221 {
222 // get width and height of detail images at current level
223 int lwidth = p->vertical->image->width;
224 int lheight = p->vertical->image->height;
225
226 if (verbose > 1)
227 fprintf(stderr, "%s: extracting at level %d now, size %d x %d\n",
228 progname, p->coarse->level, lwidth, lheight);
229
230 // consider each coefficient at resolution level
231 for (row = 0; row < lwidth - STEP; row += STEP)
232 for (col = 0; col < lheight - STEP; col += STEP) {
233 double h, v, d;
234 double *f1 = &h, *f2 = &v, *f3 = &d;
235 double delta;
236
237 // key-dependant coefficient selection
238 r = row + 1 + random() % (STEP-2);
239 c = col + 1 + random() % (STEP-2);
240
241 // get coefficient values, one from each detail image
242 h = get_pixel(p->horizontal->image, c, r);
243 v = get_pixel(p->vertical->image, c, r);
244 d = get_pixel(p->diagonal->image, c, r);
245
246 // order pointer to coefficient values such that f1 <= f2 <= f3
247 #define SWAP(A, B) {double *t = A; A = B; B = t;}
248 if (*f1 > *f2) SWAP(f1, f2);
249 if (*f2 > *f3) SWAP(f2, f3);
250 if (*f1 > *f2) SWAP(f1, f2);
251
252 // calculate delta, the width of the bins
253 delta = (*f3 - *f1) / (double) (2 * quality - 1);
254
255 // set middle coefficient to closest appropriate bin,
256 // according to watermark bit
257 if (quality == 1)
258 set_signature_bit(n, (*f3 - *f2) < (*f2 - *f1));
259 else {
260 double l = *f1;
261 int i = 0;
262 while ((l + delta) < *f2) {
263 l += delta;
264 i++;
265 }
266 if (i % 2)
267 set_signature_bit(n, (l + delta - *f2) > (*f2 - l));
268 else
269 set_signature_bit(n, (l + delta - *f2) < (*f2 - l));
270 }
271
272 if (verbose > 2)
273 fprintf(stderr, "%s: extracted bit #%d (= %d =? %d) at (%d/%d),\n"
274 " f1=%lf, f2=%lf, f3=%lf\n", progname, n,
275 get_signature_bit(n), get_signature2_bit(n),
276 c, r, *f1, *f2, *f3);
277 n++;
278 }
279 }
280
281 fprintf(out, "KD3WM\n");
282 fprintf(out, "%d\n", n);
283 nbit_signature = n;
284 binstr = malloc(sizeof(char) * (nbit_signature + 1));
285 sig_to_binstr(binstr);
286 fprintf(out, "%s\n", binstr);
287 free(binstr);
288 fclose(out);
289
290 pgm_freearray(input_image, rows);
291
292 exit(0);
293 }

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