Mercurial > hg > wm
annotate Meerwald/wm_xie2_e.c @ 21:1c4ccd635a68 v0.6
ignore *.swp
| author | Peter Meerwald-Stadler <pmeerw@pmeerw.net> |
|---|---|
| date | Sat, 28 Jan 2023 23:57:40 +0100 |
| parents | 4987db85cfae |
| children |
| rev | line source |
|---|---|
| 3 | 1 #include "wm.h" |
| 2 #include "signature.h" | |
| 3 #include "dwt.h" | |
| 4 #include "pgm.h" | |
| 5 | |
| 6 char *progname; | |
| 7 | |
| 8 // watermarking transformation, set median pixel to quantization boundary | |
| 9 double wm_transform(int quant, double f1, double f2, double f3, int x) { | |
| 10 double s = (fabs(f3) - fabs(f1)) / (double) quant; | |
| 11 double l = x ? (f1 + s) : f1; | |
| 12 double f2new; | |
| 13 | |
| 14 while ((l + 2 * s) < f2) l += 2 * s; | |
| 15 f2new = ((f2 - l) < (l + 2 * s - f2)) ? l : (l + 2 * s); | |
| 16 | |
| 17 return f2new; | |
| 18 } | |
| 19 | |
| 20 void usage(void) { | |
| 21 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); | |
| 22 fprintf(stderr, "\t-a n\t\tembedding strength (default 0.05)\n"); | |
| 23 fprintf(stderr, "\t-e n\t\twavelet filtering method\n"); | |
| 24 fprintf(stderr, "\t-f n\t\tfilter number\n"); | |
| 25 fprintf(stderr, "\t-F file\t\tfilter definition file\n"); | |
| 26 fprintf(stderr, "\t-l n\t\tembedding level\n"); | |
| 27 fprintf(stderr, "\t-h\t\tprint usage\n"); | |
| 28 fprintf(stderr, "\t-o file\t\toutput (watermarked) file\n"); | |
| 29 fprintf(stderr, "\t-q n\t\tquantization level\n"); | |
| 30 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\n"); | |
| 31 fprintf(stderr, "\t-v n\t\tverbosity level\n"); | |
| 32 exit(0); | |
| 33 } | |
| 34 | |
| 35 int main(int argc, char *argv[]) { | |
| 36 | |
| 37 FILE *in = stdin; | |
| 38 FILE *out = stdout; | |
| 39 FILE *sig = NULL; | |
| 40 | |
| 41 char output_name[MAXPATHLEN] = "(stdout)"; | |
| 42 char input_name[MAXPATHLEN] = "(stdin)"; | |
| 43 char signature_name[MAXPATHLEN]; | |
| 44 | |
| 45 int c, n; | |
| 46 int row, col; | |
| 47 | |
| 48 double alpha = 0.0; | |
| 49 int filter = 0; | |
| 50 int method = -1; | |
| 51 int level = 0; | |
| 52 int quant = 0; | |
| 53 char filter_name[MAXPATHLEN] = ""; | |
| 54 | |
| 55 int seed; | |
| 56 int verbose = 0; | |
| 57 | |
| 58 gray **image; | |
| 59 Image_tree dwts, p; | |
| 60 | |
| 61 gray maxval; | |
| 8 | 62 int rows, cols, format; |
| 3 | 63 |
| 64 progname = argv[0]; | |
| 65 | |
| 66 pgm_init(&argc, argv); wm_init(); | |
| 67 | |
| 68 while ((c = getopt(argc, argv, "a:e:f:F:h?l:o:s:v:")) != EOF) { | |
| 69 switch (c) { | |
| 70 case 'e': | |
| 71 method = atoi(optarg); | |
| 72 if (method < 0) { | |
| 73 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method); | |
| 74 exit(1); | |
| 75 } | |
| 76 break; | |
| 77 case 'f': | |
| 78 filter = atoi(optarg); | |
| 79 if (filter <= 0) { | |
| 80 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter); | |
| 81 exit(1); | |
| 82 } | |
| 83 break; | |
| 84 case 'F': | |
| 85 strcpy(filter_name, optarg); | |
| 86 break; | |
| 87 case 'h': | |
| 88 case '?': | |
| 89 usage(); | |
| 90 break; | |
| 91 case 'l': | |
| 92 level = atoi(optarg); | |
| 93 if (level < 1) { | |
| 94 fprintf(stderr, "%s: embedding level out of range\n", progname); | |
| 95 exit(1); | |
| 96 } | |
| 97 break; | |
| 98 case 'o': | |
| 99 if ((out = fopen(optarg, "wb")) == NULL) { | |
| 100 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg); | |
| 101 exit(1); | |
| 102 } | |
| 103 strcpy(output_name, optarg); | |
| 104 break; | |
| 105 case 'q': | |
| 106 quant = atoi(optarg); | |
| 107 break; | |
| 108 case 'a': | |
| 109 alpha = atof(optarg); | |
| 110 if (alpha <= 0.0) { | |
| 111 fprintf(stderr, "%s: embedding strength factor %f out of range\n", progname, alpha); | |
| 112 exit(1); | |
| 113 } | |
| 114 break; | |
| 115 case 's': | |
| 116 if ((sig = fopen(optarg, "r")) == NULL) { | |
| 117 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg); | |
| 118 exit(1); | |
| 119 } | |
| 120 strcpy(signature_name, optarg); | |
| 121 break; | |
| 122 case 'v': | |
| 123 verbose = atoi(optarg); | |
| 124 if (verbose < 0) { | |
| 125 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose); | |
| 126 exit(1); | |
| 127 } | |
| 128 break; | |
| 129 } | |
| 130 } | |
| 131 | |
| 132 argc -= optind; | |
| 133 argv += optind; | |
| 134 | |
| 135 if (argc > 1) { | |
| 136 usage(); | |
| 137 exit(1); | |
| 138 } | |
| 139 | |
| 8 | 140 if (argc == 1 && *argv[0] != '-') { |
| 3 | 141 if ((in = fopen(argv[0], "rb")) == NULL) { |
| 142 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]); | |
| 143 exit(1); | |
| 144 } | |
| 145 else | |
| 146 strcpy(input_name, argv[0]); | |
| 8 | 147 } |
| 3 | 148 |
| 149 if (sig) { | |
| 150 char line[32]; | |
| 151 fgets(line, sizeof(line), sig); | |
| 152 if (strspn(line, "XE2SG") >= 5) { | |
| 153 fscanf(sig, "%d\n", &nbit_signature); | |
| 154 if (alpha == 0.0) | |
| 155 fscanf(sig, "%lf\n", &alpha); | |
| 156 else | |
|
16
4987db85cfae
fix another scanf() warning
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
15
diff
changeset
|
157 fscanf(sig, "%*f\n"); |
| 3 | 158 if (method < 0) |
| 159 fscanf(sig, "%d\n", &method); | |
| 160 else | |
| 161 fscanf(sig, "%*d\n"); | |
| 162 if (filter == 0) | |
| 163 fscanf(sig, "%d\n", &filter); | |
| 164 else | |
| 165 fscanf(sig, "%*d\n"); | |
| 166 if (!strcmp(filter_name, "")) | |
| 15 | 167 fscanf(sig, "%[^\n\r]\n", filter_name); |
| 3 | 168 else |
| 169 fscanf(sig, "%*[^\n\r]\n"); | |
| 170 if (quant == 0) | |
| 171 fscanf(sig, "%d\n", &quant); | |
| 172 else | |
| 173 fscanf(sig, "%*d\n"); | |
| 174 if (level == 0) | |
| 175 fscanf(sig, "%d\n", &level); | |
| 176 else | |
| 177 fscanf(sig, "%*d\n"); | |
| 178 fscanf(sig, "%d\n", &seed); | |
| 179 srandom(seed); | |
| 180 n_signature = NBITSTOBYTES(nbit_signature); | |
| 181 fread(signature, sizeof(char), n_signature, sig); | |
| 182 fscanf(sig, "\n"); | |
| 183 } | |
| 184 else { | |
| 185 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name); | |
| 186 exit(1); | |
| 187 } | |
| 188 fclose(sig); | |
| 189 } | |
| 190 else { | |
| 191 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname); | |
| 192 exit(1); | |
| 193 } | |
| 194 | |
| 195 pgm_readpgminit(in, &cols, &rows, &maxval, &format); | |
| 196 | |
| 197 if (verbose > 0) | |
| 198 fprintf(stderr, "%s: embedding %d bits with strength %d in\n" | |
| 199 " %d x %d host image, decomposition level %d\n", | |
| 200 progname, nbit_signature, quant, cols, rows, level); | |
| 201 | |
| 202 image = pgm_allocarray(cols, rows); | |
| 203 | |
| 204 for (row = 0; row < rows; row++) | |
| 205 pgm_readpgmrow(in, image[row], cols, maxval, format); | |
| 206 | |
| 207 fclose(in); | |
| 208 | |
| 209 // decomposition of image | |
| 210 init_dwt(cols, rows, filter_name, filter, level, method); | |
| 211 #ifdef POLLEN_STUFF | |
| 212 #include "pollen_stuff.c" | |
| 213 #endif | |
| 214 #ifdef PARAM_STUFF | |
| 215 #include "param_stuff.c" | |
| 216 #endif | |
| 217 | |
| 218 dwts = fdwt(image); | |
| 219 | |
| 220 p = dwts; | |
| 221 | |
| 222 // consider each resolution level | |
| 223 while (p->level < level) | |
| 224 // descend one level | |
| 225 p = p->coarse; | |
| 226 | |
| 227 // repeat binary watermark by sliding a 3-pixel window of approximation image | |
| 228 n = 0; | |
| 229 for (row = 0; row < p->image->height; row++) { | |
| 230 col = 0; | |
| 231 while (col < p->image->width - 3) { | |
| 232 double MIN_DIFF = (20.0 * alpha); | |
| 233 double b1, b2, b3; | |
| 234 double *f1 = &b1, *f2 = &b2, *f3 = &b3; | |
| 235 double f2new; | |
| 236 | |
| 237 // get all three approximation pixels in window | |
| 238 b1 = get_pixel(p->image, col + 0, row); | |
| 239 b2 = get_pixel(p->image, col + 1, row); | |
| 240 b3 = get_pixel(p->image, col + 2, row); | |
| 241 | |
| 242 // bring selected pixels in ascending order | |
| 243 #define SWAP(A, B) {double *t = A; A = B; B = t;} | |
| 244 if (*f1 > *f2) SWAP(f1, f2); | |
| 245 if (*f2 > *f3) SWAP(f2, f3); | |
| 246 if (*f1 > *f2) SWAP(f1, f2); | |
| 247 | |
| 248 if ((*f3 - *f1) < MIN_DIFF) { | |
| 249 double adj = (MIN_DIFF - (*f3 - *f1)) / 2.0; | |
| 250 *f1 -= adj; | |
| 251 *f3 += adj; | |
| 252 } | |
| 253 | |
| 254 // apply watermarking transformation (modify median pixel) | |
| 255 f2new = wm_transform(quant, *f1, *f2, *f3, get_signature_bit(n % nbit_signature)); | |
| 256 | |
| 257 if (verbose > 1) | |
| 258 fprintf(stderr, "%s: embedding #%d (= %d) at (%d/%d); %f < %f -> %f < %f\n", | |
| 259 progname, n, get_signature_bit(n % nbit_signature), col, row, *f1, *f2, f2new, *f3); | |
| 260 | |
| 261 *f2 = f2new; | |
| 262 | |
| 263 // write modified pixel | |
| 264 set_pixel(p->image, col + 0, row, b1); | |
| 265 set_pixel(p->image, col + 1, row, b2); | |
| 266 set_pixel(p->image, col + 2, row, b3); | |
| 267 n++; | |
| 268 col += 3; | |
| 269 col+= (2.0 / alpha); | |
| 270 } | |
| 271 } | |
| 272 | |
| 273 | |
| 274 // skip over some pixels | |
| 275 | |
| 276 idwt(dwts, image); | |
| 277 | |
| 278 pgm_writepgminit(out, cols, rows, maxval, 0); | |
| 279 | |
| 280 for (row = 0; row < rows; row++) | |
| 281 pgm_writepgmrow(out, image[row], cols, maxval, 0); | |
| 282 | |
| 283 fclose(out); | |
| 284 | |
| 285 pgm_freearray(image, rows); | |
| 286 | |
| 287 exit(0); | |
| 288 } |