Mercurial > hg > wm
annotate Meerwald/wm_cox_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 "dct.h" | |
| 3 #include "pgm.h" | |
| 8 | 4 #include "sort.h" |
| 0 | 5 |
| 6 char *progname; | |
| 7 | |
| 8 void usage(void) { | |
| 9 fprintf(stderr, "usage: %s [-a n] [-h] [-n n] [-o file] [-s file] [-v n] -i file file\n\n", progname); | |
| 10 fprintf(stderr, "\t-a n\t\talpha factor (default 0.3)\n"); | |
| 11 fprintf(stderr, "\t-h\t\tprint usage\n"); | |
| 12 fprintf(stderr, "\t-i file\t\toriginal image file\n"); | |
| 13 fprintf(stderr, "\t-n n\t\twatermark length (default 100)\n"); | |
| 14 fprintf(stderr, "\t-o file\t\textracted signature file\n"); | |
| 15 fprintf(stderr, "\t-s file\t\toriginal signature file\n"); | |
| 16 fprintf(stderr, "\t-v n\t\tverbosity level\n"); | |
| 17 exit(0); | |
| 18 } | |
| 19 | |
| 20 int main(int argc, char *argv[]) { | |
| 21 | |
| 22 FILE *in = stdin; | |
| 23 FILE *out = stdout; | |
| 24 FILE *orig = NULL; | |
| 25 FILE *sig = NULL; | |
| 26 | |
| 27 gray **input_image; | |
| 28 gray **orig_image; | |
| 29 | |
| 30 char signature_name[MAXPATHLEN]; | |
| 31 char output_name[MAXPATHLEN] = "(stdout)"; | |
| 32 char input_name[MAXPATHLEN] = "(stdin)"; | |
| 33 char orig_name[MAXPATHLEN]; | |
| 34 | |
| 35 int c; | |
| 36 int i, j; | |
| 37 int n = 100; | |
| 38 | |
| 39 double a = 0.3; | |
| 40 | |
| 41 int warn_n = 1; | |
| 42 int warn_a = 1; | |
| 43 | |
| 44 int in_rows, in_cols, in_format; | |
| 45 gray in_maxval; | |
| 46 int orig_rows, orig_cols, orig_format; | |
| 47 gray orig_maxval; | |
| 48 int rows, cols; | |
| 8 | 49 int row; |
| 0 | 50 |
| 51 double threshold; | |
| 52 double *largest; | |
| 53 | |
| 54 double **input_dcts; | |
| 55 double **orig_dcts; | |
| 56 | |
| 57 int verbose = 0; | |
| 58 | |
| 59 progname = argv[0]; | |
| 60 | |
| 61 pgm_init(&argc, argv); wm_init2(); | |
| 62 | |
| 63 while ((c = getopt(argc, argv, "h?i:n:o:s:v:")) != EOF) { | |
| 64 switch (c) { | |
| 65 case 'a': | |
| 66 a = atof(optarg); | |
| 67 if (a <= 0.0) { | |
| 68 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a); | |
| 69 exit(1); | |
| 70 } | |
| 71 warn_a = 0; | |
| 72 break; | |
| 73 case 'h': | |
| 74 case '?': | |
| 75 usage(); | |
| 76 break; | |
| 77 case 'i': | |
| 78 if ((orig = fopen(optarg, "rb")) == NULL) { | |
| 79 fprintf(stderr, "%s: unable to open original image file %s\n", progname, optarg); | |
| 80 exit(1); | |
| 81 } | |
| 82 strcpy(orig_name, optarg); | |
| 83 break; | |
| 84 case 'n': | |
| 85 n = atoi(optarg); | |
| 86 if (n < 1 || n > 1000) { | |
| 87 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n); | |
| 88 exit(1); | |
| 89 } | |
| 90 warn_n = 0; | |
| 91 break; | |
| 92 case 'o': | |
| 93 if ((out = fopen(optarg, "w")) == NULL) { | |
| 94 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg); | |
| 95 exit(1); | |
| 96 } | |
| 97 strcpy(output_name, optarg); | |
| 98 break; | |
| 99 case 's': | |
| 100 if ((sig = fopen(optarg, "r")) == NULL) { | |
| 101 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg); | |
| 102 exit(1); | |
| 103 } | |
| 104 strcpy(signature_name, optarg); | |
| 105 break; | |
| 106 case 'v': | |
| 107 verbose = atoi(optarg); | |
| 108 if (verbose < 0) { | |
| 109 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose); | |
| 110 exit(1); | |
| 111 } | |
| 112 break; | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 argc -= optind; | |
| 117 argv += optind; | |
| 118 | |
| 119 if (argc > 1) { | |
| 120 usage(); | |
| 121 exit(1); | |
| 122 } | |
| 123 | |
| 8 | 124 if (argc == 1 && *argv[0] != '-') { |
| 0 | 125 if ((in = fopen(argv[0], "rb")) == NULL) { |
| 126 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]); | |
| 127 exit(1); | |
| 128 } | |
| 129 else | |
| 130 strcpy(input_name, argv[0]); | |
| 8 | 131 } |
| 132 | |
| 0 | 133 if (!orig) { |
| 134 fprintf(stderr, "%s: original image file not specified, use -i file option\n", progname); | |
| 135 exit(1); | |
| 136 } | |
| 137 | |
| 138 if (sig) { | |
| 139 char line[32]; | |
| 140 fgets(line, sizeof(line), sig); | |
| 141 if (strspn(line, "CXSG") >= 4) { | |
| 142 fscanf(sig, "%d\n", &n); | |
| 143 if (warn_a) | |
| 144 fscanf(sig, "%lf\n", &a); | |
| 145 else | |
|
16
4987db85cfae
fix another scanf() warning
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
8
diff
changeset
|
146 fscanf(sig, "%*f\n"); |
|
4987db85cfae
fix another scanf() warning
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
8
diff
changeset
|
147 fscanf(sig, "%*f\n"); |
|
4987db85cfae
fix another scanf() warning
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
8
diff
changeset
|
148 fscanf(sig, "%*f\n"); |
| 0 | 149 } |
| 150 else { | |
| 151 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name); | |
| 152 exit(1); | |
| 153 } | |
| 154 fclose(sig); | |
| 155 } | |
| 156 else { | |
| 157 if (warn_a) | |
| 158 fprintf(stderr, "%s: warning - alpha factor not specified, using default %f\n", progname, a); | |
| 159 if (warn_n) | |
| 160 fprintf(stderr, "%s: warning - watermark length not specified, using default %d\n", progname, n); | |
| 161 } | |
| 162 | |
| 163 pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format); | |
| 164 pgm_readpgminit(orig, &orig_cols, &orig_rows, &orig_maxval, &orig_format); | |
| 165 | |
| 166 if (in_cols != orig_cols || in_rows != orig_rows) { | |
| 167 fprintf(stderr, "%s: input image %s does not match dimensions of original image %s\n", progname, input_name, orig_name); | |
| 168 exit(1); | |
| 169 } | |
| 170 | |
| 171 cols = in_cols; | |
| 172 rows = in_rows; | |
| 173 | |
| 174 init_dct_NxN(cols, rows); | |
| 175 | |
| 176 input_image = pgm_allocarray(in_cols, in_rows); | |
| 177 | |
| 178 orig_image = pgm_allocarray(orig_cols, orig_rows); | |
| 179 | |
| 180 for (row = 0; row < in_rows; row++) | |
| 181 pgm_readpgmrow(in, input_image[row], in_cols, in_maxval, in_format); | |
| 182 | |
| 183 fclose(in); | |
| 184 | |
| 185 for (row = 0; row < orig_rows; row++) | |
| 186 pgm_readpgmrow(orig, orig_image[row], orig_cols, orig_maxval, orig_format); | |
| 187 | |
| 188 fclose(orig); | |
| 189 | |
| 190 input_dcts = alloc_coeffs(cols, rows); | |
| 191 orig_dcts = alloc_coeffs(cols, rows); | |
| 192 | |
| 193 fdct_NxN(input_image, input_dcts); | |
| 194 fdct_NxN(orig_image, orig_dcts); | |
| 195 | |
| 196 largest = malloc((n + 1) * sizeof(double)); | |
| 197 select_largest_coeffs(orig_dcts[0], cols * rows, n+1, largest); | |
| 198 threshold = largest[0]; | |
| 199 free(largest); | |
| 200 | |
| 201 fprintf(out, "CXWM\n"); | |
| 202 fprintf(out, "%d\n", n); | |
| 203 | |
| 204 j = 0; | |
| 205 for (i = 0; i < n; i++) { | |
| 206 double d, o, p; | |
| 207 | |
| 208 while ((o = orig_dcts[j / cols][j % cols]) < threshold) j++; | |
| 209 | |
| 210 p = input_dcts[j / cols][j % cols]; | |
| 211 | |
| 212 d = (p / o - 1.0) / a; | |
| 213 if (verbose >= 1) | |
| 214 fprintf(stderr, "input %f orig %f alpha %f d %f\n", p, o, a, d); | |
| 215 fprintf(out, "%f\n", d); | |
| 216 j++; | |
| 217 } | |
| 218 | |
| 219 fclose(out); | |
| 220 | |
| 221 free_coeffs(input_dcts); | |
| 222 free_coeffs(orig_dcts); | |
| 223 | |
| 224 pgm_freearray(input_image, rows); | |
| 225 pgm_freearray(orig_image, rows); | |
| 226 | |
| 227 exit(0); | |
| 228 } |