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comparison Meerwald-dir/wm_kim_a.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_kim_a.c@4987db85cfae
children
comparison
equal deleted inserted replaced
23:71dd4b96221b 24:9f20bce6184e
1 #include "wm.h"
2 #include "wm_dwt.h"
3 #include "pgm.h"
4 #include "dwt_util.h"
5 #include "kim_common.h"
6
7 char *progname;
8
9 void usage(void) {
10 fprintf(stderr, "usage: %s [-a n] [-A n] [-e n] [-f n] [-F n] [-h] [-l n] [-o file] [-v n] -s file file\n\n", progname);
11 fprintf(stderr, "\t-a n\t\talpha factor/embedding strength for detail subbands\n");
12 fprintf(stderr, "\t-a n\t\talpha factor/embedding strength for approximation subband\n");
13 fprintf(stderr, "\t-e n\t\twavelet filtering method\n");
14 fprintf(stderr, "\t-f n\t\tfilter number\n");
15 fprintf(stderr, "\t-F file\t\tfilter definition file\n");
16 fprintf(stderr, "\t-h\t\tprint usage\n");
17 fprintf(stderr, "\t-l n\t\tdecomposition level\n");
18 fprintf(stderr, "\t-o file\t\toutput (watermarked) file\n");
19 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\n");
20 fprintf(stderr, "\t-v n\t\tverbosity level\n");
21 exit(0);
22 }
23
24 int mark_subband(Image_tree s, int name, double alpha, double watermark[], double threshold, int w, int n, int verbose) {
25 int i, j;
26 double last = 0.0;
27
28 for (i = 5; i < s->image->height-5; i++)
29 for (j = 5; j < s->image->width-5; j++) {
30 double coeff, newcoeff;
31
32 coeff = get_pixel(s->image, i, j);
33 if (fabs(coeff) > threshold / 1.5 ) {
34 newcoeff = coeff - coeff * alpha * watermark[w++ % n];
35 set_pixel(s->image, i, j, newcoeff);
36
37 fprintf(stderr, "%s: (%d/%d) %f: %f -> %f; a=%f\n", progname, j, i, watermark[w % n], coeff, newcoeff, alpha);
38 w++;
39 }
40 }
41
42 if (verbose > 5)
43 fprintf(stderr, "%s: watermarking %s%d, size %d x %d; embedded %d coeffs. total\n",
44 progname, subband_name(name), s->level, s->image->width, s->image->height, w);
45
46 return w;
47 }
48
49 int main(int argc, char *argv[]) {
50
51 FILE *in = stdin;
52 FILE *out = stdout;
53 FILE *sig = NULL;
54
55 char output_name[MAXPATHLEN] = "(stdout)";
56 char input_name[MAXPATHLEN] = "(stdin)";
57 char signature_name[MAXPATHLEN];
58
59 int i, c, w;
60 int row, col;
61
62 int n;
63
64 double alpha_detail = 0.0;
65 double alpha_approx = 0.0;
66 int level = 0;
67
68 int filter = 0;
69 int method = -1;
70 int levels;
71 char filter_name[MAXPATHLEN] = "";
72
73 int verbose = 0;
74
75 gray **image;
76 Image_tree p, dwts;
77
78 gray maxval;
79 int rows, cols, colors, format;
80
81 double *watermark;
82
83 progname = argv[0];
84
85 pgm_init(&argc, argv);
86
87 #ifdef __EMX__
88 _fsetmode(in, "b");
89 _fsetmode(out, "b");
90 #endif
91
92 while ((c = getopt(argc, argv, "a:A:e:f:F:h?o:l:s:v:")) != EOF) {
93 switch (c) {
94 case 'a':
95 alpha_detail = atof(optarg);
96 if (alpha_detail <= 0.0) {
97 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha_detail);
98 exit(1);
99 }
100 break;
101 case 'A':
102 alpha_approx = atof(optarg);
103 if (alpha_approx <= 0.0) {
104 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha_approx);
105 exit(1);
106 }
107 break;
108 case 'l':
109 level = atoi(optarg);
110 if (level <= 0) {
111 fprintf(stderr, "%s: decomposition level %d out of range\n", progname, level);
112 exit(1);
113 }
114 break;
115 case 'e':
116 method = atoi(optarg);
117 if (method < 0) {
118 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
119 exit(1);
120 }
121 break;
122 case 'f':
123 filter = atoi(optarg);
124 if (filter <= 0) {
125 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
126 exit(1);
127 }
128 break;
129 case 'F':
130 strcpy(filter_name, optarg);
131 break;
132 case 'h':
133 case '?':
134 usage();
135 break;
136 case 'o':
137 if ((out = fopen(optarg, "wb")) == NULL) {
138 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
139 exit(1);
140 }
141 strcpy(output_name, optarg);
142 break;
143 case 's':
144 if ((sig = fopen(optarg, "r")) == NULL) {
145 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
146 exit(1);
147 }
148 strcpy(signature_name, optarg);
149 break;
150 case 'v':
151 verbose = atoi(optarg);
152 if (verbose < 0) {
153 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
154 exit(1);
155 }
156 break;
157 }
158 }
159
160 argc -= optind;
161 argv += optind;
162
163 if (argc > 1) {
164 usage();
165 exit(1);
166 }
167
168 if (argc == 1 && *argv[0] != '-')
169 if ((in = fopen(argv[0], "rb")) == NULL) {
170 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
171 exit(1);
172 }
173 else
174 strcpy(input_name, argv[0]);
175
176 if (sig) {
177 char line[32];
178 fgets(line, sizeof(line), sig);
179 if (strspn(line, "KISG") >= 4) {
180 fscanf(sig, "%d\n", &n);
181 if (alpha_detail == 0.0)
182 fscanf(sig, "%lf\n", &alpha_detail);
183 else
184 fscanf(sig, "%*f\n");
185 if (alpha_approx == 0.0)
186 fscanf(sig, "%lf\n", &alpha_approx);
187 else
188 fscanf(sig, "%*f\n");
189 if (level == 0)
190 fscanf(sig, "%d\n", &level);
191 else
192 fscanf(sig, "%*d\n");
193 if (method < 0)
194 fscanf(sig, "%d\n", &method);
195 else
196 fscanf(sig, "%*d\n");
197 if (filter == 0)
198 fscanf(sig, "%d\n", &filter);
199 else
200 fscanf(sig, "%*d\n");
201 if (!strcmp(filter_name, ""))
202 fscanf(sig, "%[^\n\r]\n", filter_name);
203 else
204 fscanf(sig, "%*[^\n\r]\n");
205 }
206 else {
207 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
208 exit(1);
209 }
210 }
211 else {
212 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
213 exit(1);
214 }
215
216 watermark = malloc(n * sizeof(double));
217 for (i = 0; i < n; i++)
218 fscanf(sig, "%lf\n", &watermark[i]);
219 fclose(sig);
220
221 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
222 image = pgm_allocarray(cols, rows);
223 for (row = 0; row < rows; row++)
224 pgm_readpgmrow(in, image[row], cols, maxval, format);
225 fclose(in);
226
227 // complete decomposition
228 levels = find_deepest_level(cols, rows) - 1;
229 if (level > levels) {
230 fprintf(stderr, "%s: decomposition level %d not possible (max. %d), image size is %d x %d\n", progname, level, levels, cols, rows);
231 exit(1);
232 }
233
234 // wavelet transform
235 init_dwt(cols, rows, filter_name, filter, level, method);
236 #ifdef POLLEN_STUFF
237 #include "pollen_stuff.c"
238 #endif
239 #ifdef PARAM_STUFF
240 #include "param_stuff.c"
241 #endif
242
243 dwts = fdwt(image);
244
245 p = dwts;
246 w = 0;
247
248 // process each decomposition level
249 while (p->coarse) {
250 int current_level;
251 double threshold;
252 double max_coeff;
253 double alpha;
254
255 // get current decomposition level number
256 current_level = p->horizontal->level;
257
258 // find largest absolute coefficient in detail subbands of current decomposition level
259 max_coeff = find_level_largest_coeff(p, verbose);
260
261 // calculate significance threshold for current decomposition level
262 threshold = calc_level_threshold(max_coeff, verbose);
263
264 // calculate embedding strength alpha for current decomposition level
265 alpha = calc_level_alpha_detail(alpha_detail, level, current_level, verbose);
266
267 if (verbose > 1)
268 fprintf(stderr, "%s: level %d, threshold %f, alpha %f\n", progname, current_level, threshold, alpha);
269
270 // embed watermark sequence into detail subbands of current decomposition level
271 w = mark_subband(p->horizontal, HORIZONTAL, alpha, watermark, threshold, w, n, verbose);
272 w = mark_subband(p->vertical, VERTICAL, alpha, watermark, threshold, w, n, verbose);
273 w = mark_subband(p->diagonal, DIAGONAL, alpha, watermark, threshold, w, n, verbose);
274
275 p = p->coarse;
276 }
277
278 // mark approximation image using calculated significance threshold and embedding strength
279 w = mark_subband(p, COARSE, alpha_approx, watermark, calc_level_threshold(find_subband_largest_coeff(p, COARSE, verbose), verbose), w, n, verbose);
280
281 free(watermark);
282 idwt(dwts, image);
283
284 pgm_writepgminit(out, cols, rows, maxval, 0);
285 for (row = 0; row < rows; row++)
286 pgm_writepgmrow(out, image[row], cols, maxval, 0);
287 fclose(out);
288
289 pgm_freearray(image, rows);
290
291 exit(0);
292 }

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