Mercurial > hg > wm
annotate Meerwald/wm_xie_d.c @ 22:d8551fb39a5e default tip
Added tag v0.6 for changeset 1c4ccd635a68
| author | Peter Meerwald-Stadler <pmeerw@pmeerw.net> |
|---|---|
| date | Sat, 28 Jan 2023 23:57:51 +0100 |
| parents | 4987db85cfae |
| children |
| rev | line source |
|---|---|
| 0 | 1 #include "wm.h" |
| 2 #include "signature.h" | |
| 3 #include "dwt.h" | |
| 4 #include "pgm.h" | |
| 5 | |
| 6 char *progname; | |
| 7 | |
| 8 // inverse watermarking transformation, extract embedded bit, check quantization boundaries | |
| 9 double wm_transform(double alpha, double f1, double f2, double f3) { | |
| 10 double s = alpha * (fabs(f3) - fabs(f1)) / 2.0; | |
| 11 double l = f1; | |
| 12 int x; | |
| 13 | |
| 14 x = 0; | |
| 15 while (l < f2) { | |
| 16 l += s; | |
| 17 x++; | |
| 18 } | |
| 19 | |
| 20 if (fabs(l - s - f2) < fabs(l-f2)) | |
| 21 return (x+1) % 2; | |
| 22 else | |
| 23 return (x) % 2; | |
| 24 } | |
| 25 | |
| 26 void usage(void) { | |
| 27 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); | |
| 28 fprintf(stderr, "\t-a n\t\tembedding strength (default 0.05)\n"); | |
| 29 fprintf(stderr, "\t-e n\t\twavelet filtering method\n"); | |
| 30 fprintf(stderr, "\t-f n\t\tfilter number\n"); | |
| 31 fprintf(stderr, "\t-F file\t\tfilter definition file\n"); | |
| 32 fprintf(stderr, "\t-l n\t\tembedding level\n"); | |
| 33 fprintf(stderr, "\t-h\t\tprint usage\n"); | |
| 34 fprintf(stderr, "\t-o file\t\textracted signature file\n"); | |
| 35 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\n"); | |
| 36 fprintf(stderr, "\t-v n\t\tverbosity level\n"); | |
| 37 exit(0); | |
| 38 } | |
| 39 | |
| 40 int main(int argc, char *argv[]) { | |
| 41 | |
| 42 FILE *in = stdin; | |
| 43 FILE *out = stdout; | |
| 44 FILE *sig = NULL; | |
| 45 | |
| 46 char output_name[MAXPATHLEN] = "(stdout)"; | |
| 47 char input_name[MAXPATHLEN] = "(stdin)"; | |
| 48 char signature_name[MAXPATHLEN]; | |
| 49 | |
| 50 int c, n; | |
| 51 int row, col; | |
| 52 | |
| 53 double alpha = 0.0; | |
| 54 int filter = 0; | |
| 55 int method = -1; | |
| 56 int level = 0; | |
| 57 char filter_name[MAXPATHLEN] = ""; | |
| 58 | |
| 59 int seed; | |
| 60 int verbose = 0; | |
| 61 | |
| 62 gray **image; | |
| 63 Image_tree dwts, p; | |
| 64 | |
| 65 gray maxval; | |
| 8 | 66 int rows, cols, format; |
| 0 | 67 |
| 68 progname = argv[0]; | |
| 69 | |
| 70 pgm_init(&argc, argv); wm_init2(); | |
| 71 | |
| 72 while ((c = getopt(argc, argv, "a:e:f:F:h?l:o:s:v:")) != EOF) { | |
| 73 switch (c) { | |
| 74 case 'e': | |
| 75 method = atoi(optarg); | |
| 76 if (method < 0) { | |
| 77 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method); | |
| 78 exit(1); | |
| 79 } | |
| 80 break; | |
| 81 case 'f': | |
| 82 filter = atoi(optarg); | |
| 83 if (filter <= 0) { | |
| 84 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter); | |
| 85 exit(1); | |
| 86 } | |
| 87 break; | |
| 88 case 'F': | |
| 89 strcpy(filter_name, optarg); | |
| 90 break; | |
| 91 case 'h': | |
| 92 case '?': | |
| 93 usage(); | |
| 94 break; | |
| 95 case 'l': | |
| 96 level = atoi(optarg); | |
| 97 if (level < 1) { | |
| 98 fprintf(stderr, "%s: embedding level out of range\n", progname); | |
| 99 exit(1); | |
| 100 } | |
| 101 break; | |
| 102 case 'o': | |
| 103 if ((out = fopen(optarg, "wb")) == NULL) { | |
| 104 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg); | |
| 105 exit(1); | |
| 106 } | |
| 107 strcpy(output_name, optarg); | |
| 108 break; | |
| 109 case 'a': | |
| 110 alpha = atof(optarg); | |
| 111 if (alpha <= 0.0) { | |
| 112 fprintf(stderr, "%s: embedding strength factor %f out of range\n", progname, alpha); | |
| 113 exit(1); | |
| 114 } | |
| 115 break; | |
| 116 case 's': | |
| 117 if ((sig = fopen(optarg, "r")) == NULL) { | |
| 118 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg); | |
| 119 exit(1); | |
| 120 } | |
| 121 strcpy(signature_name, optarg); | |
| 122 break; | |
| 123 case 'v': | |
| 124 verbose = atoi(optarg); | |
| 125 if (verbose < 0) { | |
| 126 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose); | |
| 127 exit(1); | |
| 128 } | |
| 129 break; | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 argc -= optind; | |
| 134 argv += optind; | |
| 135 | |
| 136 if (argc > 1) { | |
| 137 usage(); | |
| 138 exit(1); | |
| 139 } | |
| 140 | |
| 8 | 141 if (argc == 1 && *argv[0] != '-') { |
| 0 | 142 if ((in = fopen(argv[0], "rb")) == NULL) { |
| 143 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]); | |
| 144 exit(1); | |
| 145 } | |
| 146 else | |
| 147 strcpy(input_name, argv[0]); | |
| 8 | 148 } |
| 149 | |
| 0 | 150 if (sig) { |
| 151 char line[32]; | |
| 152 fgets(line, sizeof(line), sig); | |
| 153 if (strspn(line, "XESG") >= 4) { | |
| 154 fscanf(sig, "%d\n", &nbit_signature); | |
| 155 if (alpha == 0.0) | |
| 156 fscanf(sig, "%lf\n", &alpha); | |
| 157 else | |
|
16
4987db85cfae
fix another scanf() warning
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
15
diff
changeset
|
158 fscanf(sig, "%*f\n"); |
| 0 | 159 if (method < 0) |
| 160 fscanf(sig, "%d\n", &method); | |
| 161 else | |
| 162 fscanf(sig, "%*d\n"); | |
| 163 if (filter == 0) | |
| 164 fscanf(sig, "%d\n", &filter); | |
| 165 else | |
| 166 fscanf(sig, "%*d\n"); | |
| 167 if (!strcmp(filter_name, "")) | |
| 15 | 168 fscanf(sig, "%[^\n\r]\n", filter_name); |
| 0 | 169 else |
| 170 fscanf(sig, "%*[^\n\r]\n"); | |
| 171 if (level == 0) | |
| 172 fscanf(sig, "%d\n", &level); | |
| 173 else | |
| 174 fscanf(sig, "%*d\n"); | |
| 175 fscanf(sig, "%d\n", &seed); | |
| 176 srandom(seed); | |
| 177 n_signature = NBITSTOBYTES(nbit_signature); | |
| 178 fread(signature, sizeof(char), n_signature, sig); | |
| 179 fscanf(sig, "\n"); | |
| 180 } | |
| 181 else { | |
| 182 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name); | |
| 183 exit(1); | |
| 184 } | |
| 185 fclose(sig); | |
| 186 } | |
| 187 else { | |
| 188 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname); | |
| 189 exit(1); | |
| 190 } | |
| 191 | |
| 192 pgm_readpgminit(in, &cols, &rows, &maxval, &format); | |
| 193 if (verbose > 0) | |
| 194 fprintf(stderr, "%s: embedding %d bits with strength %f in\n" | |
| 195 " %d x %d host image, decomposition level %d\n", | |
| 196 progname, nbit_signature, alpha, cols, rows, level); | |
| 197 | |
| 198 image = pgm_allocarray(cols, rows); | |
| 199 for (row = 0; row < rows; row++) | |
| 200 pgm_readpgmrow(in, image[row], cols, maxval, format); | |
| 201 fclose(in); | |
| 202 | |
| 203 // decomposition of image | |
| 204 init_dwt(cols, rows, filter_name, filter, level, method); | |
| 205 #ifdef POLLEN_STUFF | |
| 3 | 206 #include "pollen_stuff.c" |
| 0 | 207 #endif |
| 208 #ifdef PARAM_STUFF | |
| 3 | 209 #include "param_stuff.c" |
| 0 | 210 #endif |
| 211 | |
| 212 dwts = fdwt(image); | |
| 213 | |
| 214 p = dwts; | |
| 215 | |
| 216 // consider each resolution level | |
| 217 while (p->level < level) | |
| 218 // descend one level | |
| 219 p = p->coarse; | |
| 220 | |
| 221 // repeat binary watermark by sliding a 3-pixel window of approximation image | |
| 222 n = 0; | |
| 223 for (row = 0; row < p->image->height; row++) { | |
| 224 for (col = 0; col < p->image->width - 3; col += 3) { | |
| 225 double b1, b2, b3; | |
| 226 double *f1 = &b1, *f2 = &b2, *f3 = &b3; | |
| 227 | |
| 228 // get all three approximation pixels in window | |
| 229 b1 = get_pixel(p->image, col + 0, row); | |
| 230 b2 = get_pixel(p->image, col + 1, row); | |
| 231 b3 = get_pixel(p->image, col + 2, row); | |
| 232 | |
| 233 // bring selected pixels in ascending order | |
| 234 #define SWAP(A, B) {double *t = A; A = B; B = t;} | |
| 235 if (*f1 > *f2) SWAP(f1, f2); | |
| 236 if (*f2 > *f3) SWAP(f2, f3); | |
| 237 if (*f1 > *f2) SWAP(f1, f2); | |
| 238 | |
| 239 set_signature_bit(n, wm_transform(alpha, *f1, *f2, *f3)); | |
| 240 | |
| 241 if (verbose > 1) | |
| 242 fprintf(stderr, "%s: extracting #%d (= %d) at (%d/%d); %f < %f < %f\n", | |
| 243 progname, n, get_signature_bit(n % nbit_signature), col, row, *f1, *f2, *f3); | |
| 244 | |
| 245 n++; | |
| 246 } | |
| 247 } | |
| 248 | |
| 249 fprintf(out, "XEWM\n"); | |
| 250 fprintf(out, "%d\n", n); | |
| 251 fwrite(signature, sizeof(char), NBITSTOBYTES(n), out); | |
| 252 fprintf(out, "\n"); | |
| 253 fclose(out); | |
| 254 | |
| 255 pgm_freearray(image, rows); | |
| 256 | |
| 257 exit(0); | |
| 258 } |