Mercurial > hg > wm
comparison Meerwald-dir/wm_cox_e.c @ 24:9f20bce6184e v0.7
move directories, support netpbm 11
| author | Peter Meerwald-Stadler <pmeerw@pmeerw.net> |
|---|---|
| date | Fri, 20 Dec 2024 13:08:59 +0100 |
| parents | Meerwald/wm_cox_e.c@4987db85cfae |
| children |
comparison
equal
deleted
inserted
replaced
| 23:71dd4b96221b | 24:9f20bce6184e |
|---|---|
| 1 #include "wm.h" | |
| 2 #include "dct.h" | |
| 3 #include "netpbm/pgm.h" | |
| 4 #include "sort.h" | |
| 5 | |
| 6 char *progname; | |
| 7 | |
| 8 void usage(void) { | |
| 9 fprintf(stderr, "usage: %s [-a n] [-h] [-o file] -s file file\n\n", progname); | |
| 10 fprintf(stderr, "\t-a n\t\talpha factor/embedding strength\n"); | |
| 11 fprintf(stderr, "\t-h\t\tprint usage\n"); | |
| 12 fprintf(stderr, "\t-o file\t\toutput (watermarked) file\n"); | |
| 13 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\n"); | |
| 14 exit(0); | |
| 15 } | |
| 16 | |
| 17 int main(int argc, char *argv[]) { | |
| 18 | |
| 19 FILE *in = stdin; | |
| 20 FILE *out = stdout; | |
| 21 FILE *sig = NULL; | |
| 22 | |
| 23 char output_name[MAXPATHLEN] = "(stdout)"; | |
| 24 char input_name[MAXPATHLEN] = "(stdin)"; | |
| 25 char signature_name[MAXPATHLEN]; | |
| 26 | |
| 27 int c; | |
| 28 int row; | |
| 29 int i,j; | |
| 30 | |
| 31 int n; | |
| 32 | |
| 33 double alpha = 0.0; | |
| 34 double threshold; | |
| 35 | |
| 36 double *largest; | |
| 37 gray **input_image; | |
| 38 gray **output_image; | |
| 39 double **dcts; | |
| 40 | |
| 41 gray maxval; | |
| 42 int rows, cols, format; | |
| 43 | |
| 44 progname = argv[0]; | |
| 45 | |
| 46 pgm_init(&argc, argv); wm_init(); | |
| 47 | |
| 48 while ((c = getopt(argc, argv, "a:h?o:s:")) != EOF) { | |
| 49 switch (c) { | |
| 50 case 'a': | |
| 51 alpha = atof(optarg); | |
| 52 if (alpha <= 0.0) { | |
| 53 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha); | |
| 54 exit(1); | |
| 55 } | |
| 56 break; | |
| 57 case 'h': | |
| 58 case '?': | |
| 59 usage(); | |
| 60 break; | |
| 61 case 'o': | |
| 62 if ((out = fopen(optarg, "wb")) == NULL) { | |
| 63 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg); | |
| 64 exit(1); | |
| 65 } | |
| 66 strcpy(output_name, optarg); | |
| 67 break; | |
| 68 case 's': | |
| 69 if ((sig = fopen(optarg, "r")) == NULL) { | |
| 70 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg); | |
| 71 exit(1); | |
| 72 } | |
| 73 strcpy(signature_name, optarg); | |
| 74 break; | |
| 75 } | |
| 76 } | |
| 77 | |
| 78 argc -= optind; | |
| 79 argv += optind; | |
| 80 | |
| 81 if (argc > 1) { | |
| 82 usage(); | |
| 83 exit(1); | |
| 84 } | |
| 85 | |
| 86 if (argc == 1 && *argv[0] != '-') { | |
| 87 if ((in = fopen(argv[0], "rb")) == NULL) { | |
| 88 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]); | |
| 89 exit(1); | |
| 90 } | |
| 91 else | |
| 92 strcpy(input_name, argv[0]); | |
| 93 } | |
| 94 | |
| 95 if (sig) { | |
| 96 char line[32]; | |
| 97 fgets(line, sizeof(line), sig); | |
| 98 if (strspn(line, "CXSG") >= 4) { | |
| 99 fscanf(sig, "%d\n", &n); | |
| 100 if (alpha == 0.0) | |
| 101 fscanf(sig, "%lf\n", &alpha); | |
| 102 else | |
| 103 fscanf(sig, "%*f\n"); | |
| 104 fscanf(sig, "%*f\n"); | |
| 105 fscanf(sig, "%*f\n"); | |
| 106 } | |
| 107 else { | |
| 108 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name); | |
| 109 exit(1); | |
| 110 } | |
| 111 } | |
| 112 else { | |
| 113 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname); | |
| 114 exit(1); | |
| 115 } | |
| 116 | |
| 117 pgm_readpgminit(in, &cols, &rows, &maxval, &format); | |
| 118 | |
| 119 init_dct_NxN(cols, rows); | |
| 120 | |
| 121 dcts = alloc_coeffs(cols, rows); | |
| 122 input_image = pgm_allocarray(cols, rows); | |
| 123 | |
| 124 for (row = 0; row < rows; row++) | |
| 125 pgm_readpgmrow(in, input_image[row], cols, maxval, format); | |
| 126 | |
| 127 fclose(in); | |
| 128 | |
| 129 output_image = pgm_allocarray(cols, rows); | |
| 130 | |
| 131 fdct_NxN(input_image, dcts); | |
| 132 | |
| 133 largest = malloc((n + 1) * sizeof(double)); | |
| 134 select_largest_coeffs(dcts[0], cols * rows, n+1, largest); | |
| 135 threshold = largest[0]; | |
| 136 free(largest); | |
| 137 | |
| 138 j = 0; | |
| 139 for (i = 0; i < n; i++) { | |
| 140 double v; | |
| 141 | |
| 142 while (dcts[j / cols][j % cols] < threshold) j++; | |
| 143 | |
| 144 fscanf(sig, "%lf\n", &v); | |
| 145 dcts[j / cols][j % cols] *= (1.0 + alpha * v); | |
| 146 j++; | |
| 147 } | |
| 148 | |
| 149 idct_NxN(dcts, output_image); | |
| 150 free_coeffs(dcts); | |
| 151 | |
| 152 pgm_writepgminit(out, cols, rows, maxval, 0); | |
| 153 | |
| 154 for (row = 0; row < rows; row++) | |
| 155 pgm_writepgmrow(out, output_image[row], cols, maxval, 0); | |
| 156 | |
| 157 fclose(out); | |
| 158 | |
| 159 fclose(sig); | |
| 160 | |
| 161 pgm_freearray(output_image, rows); | |
| 162 pgm_freearray(input_image, rows); | |
| 163 | |
| 164 exit(0); | |
| 165 } |