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