Mercurial > hg > wm
comparison Fotopoulos-dir/cast-hart.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 | Fotopoulos/cast-hart.c@cbecc570129d |
| children |
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| 23:71dd4b96221b | 24:9f20bce6184e |
|---|---|
| 1 /* Watermarking program - Hartley Transform based */ | |
| 2 /* Module : Casting */ | |
| 3 /* Author : Vassilis Fotopoulos */ | |
| 4 /* Date : 26/7/1999 */ | |
| 5 /* Revision : 2.01a */ | |
| 6 /* Developed at : ELLAB */ | |
| 7 /* Electronics Laboratory */ | |
| 8 /* Department of Physics */ | |
| 9 /* University of Patras - GREECE */ | |
| 10 /* Copyleft (c) 1999 */ | |
| 11 /*------------------------------------------------------*/ | |
| 12 /* pseudorandom noise generator's code is */ | |
| 13 /* taken from "Numerical Recipes in C" */ | |
| 14 /*------------------------------------------------------*/ | |
| 15 #include <stdio.h> | |
| 16 #include <stdlib.h> | |
| 17 #include <string.h> | |
| 18 #include <math.h> | |
| 19 #include <float.h> | |
| 20 #include <getopt.h> | |
| 21 #include "common.h" | |
| 22 #include "netpbm/pgm.h" | |
| 23 | |
| 24 int height, width; | |
| 25 | |
| 26 void add_watermark(double **in, int N, int coeff_start, int wm_length, int wm_key, double wm_alpha) | |
| 27 { | |
| 28 int row, col, count; | |
| 29 long int elem, L, M, seed; | |
| 30 double a; | |
| 31 count = 0; | |
| 32 elem = 0; | |
| 33 M = coeff_start; | |
| 34 L = wm_length; | |
| 35 seed = wm_key; | |
| 36 a = wm_alpha; | |
| 37 for (row = 0; row < N; row++) | |
| 38 for (col = 0; col < N; col++) { | |
| 39 elem++; | |
| 40 if (elem > M && count < L) { | |
| 41 in[row][col] += a * fabs(in[row][col]) * gasdev(&seed); | |
| 42 count++; | |
| 43 } | |
| 44 } | |
| 45 | |
| 46 } | |
| 47 | |
| 48 //-------------------------------------------------------- | |
| 49 int main(int argc, char* argv[]) | |
| 50 { | |
| 51 FILE *in, *out; | |
| 52 int **image; | |
| 53 double **image_i; | |
| 54 double **image_d; | |
| 55 int c; | |
| 56 int N; | |
| 57 int coeff_start = 5000, wm_length = 10000, wm_key = 123; | |
| 58 double wm_alpha = 0.2; | |
| 59 | |
| 60 pgm_init(&argc, argv); wm_init(); | |
| 61 | |
| 62 while ((c = getopt(argc, argv, "a:s:l:k:")) != EOF) { | |
| 63 switch (c) { | |
| 64 case 'a': | |
| 65 wm_alpha = atof(optarg); | |
| 66 break; | |
| 67 case 's': | |
| 68 coeff_start = atoi(optarg); | |
| 69 break; | |
| 70 case 'l': | |
| 71 wm_length = atoi(optarg); | |
| 72 break; | |
| 73 case 'k': | |
| 74 wm_key = atoi(optarg); | |
| 75 break; | |
| 76 } | |
| 77 } | |
| 78 argc -= optind; | |
| 79 argv += optind; | |
| 80 | |
| 81 in = stdin; | |
| 82 out = stdout; | |
| 83 | |
| 84 open_image(in, &width, &height); | |
| 85 image = imatrix(height, width); | |
| 86 load_image(image, in, width, height); | |
| 87 | |
| 88 if (height == width) | |
| 89 N = height; | |
| 90 else { | |
| 91 fprintf(stderr, "Cannot Proccess non-square images!\n"); | |
| 92 exit( -11); | |
| 93 } | |
| 94 | |
| 95 image_i = dmatrix(height, width); | |
| 96 image_d = dmatrix(height, width); | |
| 97 if (image_d == NULL) { | |
| 98 fprintf(stderr, "Unable to allocate the double array\n"); | |
| 99 exit(1); | |
| 100 } | |
| 101 matrix_i2d(image, image_i, N); | |
| 102 hartley(image_i, image_d, N); | |
| 103 add_watermark(image_d, N, coeff_start, wm_length, wm_key, wm_alpha); | |
| 104 hartley(image_d, image_i, N); | |
| 105 matrix_d2i(image_i, image, N); | |
| 106 save_image(image, out, width, height); | |
| 107 | |
| 108 freematrix_d(image_i, height); | |
| 109 freematrix_d(image_d, height); | |
| 110 fclose(in); | |
| 111 fclose(out); | |
| 112 exit(EXIT_SUCCESS); | |
| 113 } |