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comparison Meerwald-dir/wm_xia_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_xia_e.c@4987db85cfae
children
comparison
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23:71dd4b96221b 24:9f20bce6184e
1 #include "wm.h"
2 #include "dwt.h"
3 #include "netpbm/pgm.h"
4 #include "dwt_util.h"
5
6 char *progname;
7
8 void usage(void) {
9 fprintf(stderr, "usage: %s [-a n] [-e n] [-f n] [-F n] [-h] [-l n] [-o file] [-v n] -s file file\n\n", progname);
10 fprintf(stderr, "\t-a n\t\talpha factor/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\tdecomposition level\n");
16 fprintf(stderr, "\t-o file\t\toutput (watermarked) file\n");
17 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\n");
18 fprintf(stderr, "\t-v n\t\tverbosity level\n");
19 exit(0);
20 }
21
22 void mark_subband(Image_tree s, int name, double alpha, double watermark[], int n, int verbose) {
23 int i, j;
24 int w;
25
26 w = 0;
27 for (i = 5; i < s->image->height-5; i++)
28 for (j = 5; j < s->image->width-5; j++) {
29 double coeff, newcoeff;
30
31 coeff = get_pixel(s->image, i, j);
32 if (fabs(coeff) > 20.0) {
33 newcoeff = coeff + alpha * pow(fabs(coeff), 1.2) * watermark[w++ % n];
34 set_pixel(s->image, i, j, newcoeff);
35 }
36 }
37
38 if (verbose > 3)
39 fprintf(stderr, "%s: watermarking %s%d, size %d x %d; embedded %d coeffs.\n",
40 progname, subband_name(name), s->level, s->image->width, s->image->height, w);
41 }
42
43 int main(int argc, char *argv[]) {
44
45 FILE *in = stdin;
46 FILE *out = stdout;
47 FILE *sig = NULL;
48
49 char output_name[MAXPATHLEN] = "(stdout)";
50 char input_name[MAXPATHLEN] = "(stdin)";
51 char signature_name[MAXPATHLEN];
52
53 int i, c;
54 int row;
55
56 int n;
57
58 double alpha = 0.0;
59 int level = 0;
60
61 int filter = 0;
62 int method = -1;
63 int levels;
64 char filter_name[MAXPATHLEN] = "";
65
66 int verbose = 0;
67
68 gray **image;
69 Image_tree p, dwts;
70
71 gray maxval;
72 int rows, cols, format;
73
74 double *watermark;
75
76 progname = argv[0];
77
78 pgm_init(&argc, argv); wm_init();
79
80 while ((c = getopt(argc, argv, "a:e:f:F:h?o:l:s:v:")) != EOF) {
81 switch (c) {
82 case 'a':
83 alpha = atof(optarg);
84 if (alpha <= 0.0) {
85 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha);
86 exit(1);
87 }
88 break;
89 case 'l':
90 level = atoi(optarg);
91 if (level <= 0) {
92 fprintf(stderr, "%s: decomposition level %d out of range\n", progname, level);
93 exit(1);
94 }
95 break;
96 case 'e':
97 method = atoi(optarg);
98 if (method < 0) {
99 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
100 exit(1);
101 }
102 break;
103 case 'f':
104 filter = atoi(optarg);
105 if (filter <= 0) {
106 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
107 exit(1);
108 }
109 break;
110 case 'F':
111 strcpy(filter_name, optarg);
112 break;
113 case 'h':
114 case '?':
115 usage();
116 break;
117 case 'o':
118 if ((out = fopen(optarg, "wb")) == NULL) {
119 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
120 exit(1);
121 }
122 strcpy(output_name, optarg);
123 break;
124 case 's':
125 if ((sig = fopen(optarg, "r")) == NULL) {
126 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
127 exit(1);
128 }
129 strcpy(signature_name, optarg);
130 break;
131 case 'v':
132 verbose = atoi(optarg);
133 if (verbose < 0) {
134 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
135 exit(1);
136 }
137 break;
138 }
139 }
140
141 argc -= optind;
142 argv += optind;
143
144 if (argc > 1) {
145 usage();
146 exit(1);
147 }
148
149 if (argc == 1 && *argv[0] != '-') {
150 if ((in = fopen(argv[0], "rb")) == NULL) {
151 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
152 exit(1);
153 }
154 else
155 strcpy(input_name, argv[0]);
156 }
157
158 if (sig) {
159 char line[32];
160 fgets(line, sizeof(line), sig);
161 if (strspn(line, "XASG") >= 4) {
162 fscanf(sig, "%d\n", &n);
163 if (alpha == 0.0)
164 fscanf(sig, "%lf\n", &alpha);
165 else
166 fscanf(sig, "%*f\n");
167 if (level == 0)
168 fscanf(sig, "%d\n", &level);
169 else
170 fscanf(sig, "%*d\n");
171 if (method < 0)
172 fscanf(sig, "%d\n", &method);
173 else
174 fscanf(sig, "%*d\n");
175 if (filter == 0)
176 fscanf(sig, "%d\n", &filter);
177 else
178 fscanf(sig, "%*d\n");
179 if (!strcmp(filter_name, ""))
180 fscanf(sig, "%[^\n\r]\n", filter_name);
181 else
182 fscanf(sig, "%*[^\n\r]\n");
183 }
184 else {
185 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
186 exit(1);
187 }
188 }
189 else {
190 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
191 exit(1);
192 }
193
194 watermark = malloc(n * sizeof(double));
195 for (i = 0; i < n; i++)
196 fscanf(sig, "%lf\n", &watermark[i]);
197 fclose(sig);
198
199 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
200 image = pgm_allocarray(cols, rows);
201 for (row = 0; row < rows; row++)
202 pgm_readpgmrow(in, image[row], cols, maxval, format);
203 fclose(in);
204
205 // complete decomposition
206 levels = find_deepest_level(cols, rows) - 1;
207 if (level > levels) {
208 fprintf(stderr, "%s: decomposition level %d not possible (max. %d), image size is %d x %d\n", progname, level, levels, cols, rows);
209 exit(1);
210 }
211
212 // wavelet transform
213 init_dwt(cols, rows, filter_name, filter, level, method);
214 #ifdef POLLEN_STUFF
215 #include "pollen_stuff.c"
216 #endif
217 #ifdef PARAM_STUFF
218 #include "param_stuff.c"
219 #endif
220
221 dwts = fdwt(image);
222
223 p = dwts;
224 while (p->coarse) {
225
226 mark_subband(p->horizontal, HORIZONTAL, alpha, watermark, n, verbose);
227 mark_subband(p->vertical, VERTICAL, alpha, watermark, n, verbose);
228 mark_subband(p->diagonal, DIAGONAL, alpha, watermark, n, verbose);
229
230 p = p->coarse;
231 }
232
233 free(watermark);
234 idwt(dwts, image);
235
236 pgm_writepgminit(out, cols, rows, maxval, 0);
237 for (row = 0; row < rows; row++)
238 pgm_writepgmrow(out, image[row], cols, maxval, 0);
239 fclose(out);
240
241 pgm_freearray(image, rows);
242
243 exit(0);
244 }

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