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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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22
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23 int height, width;
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24
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25 void add_watermark(double **in, int N, int coeff_start, int wm_length, int wm_key, double wm_alpha)
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26 {
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27 int row, col, count;
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28 long int elem, L, M, temp, seed;
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29 double a;
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30 count = 0;
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31 elem = 0;
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32 M = coeff_start;
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33 L = wm_length;
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34 seed = wm_key;
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35 a = wm_alpha;
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36 for (row = 0; row < N; row++)
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37 for (col = 0; col < N; col++) {
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38 elem++;
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39 if (elem > M && count < L) {
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40 in[row][col] += a * fabs(in[row][col]) * gasdev(&seed);
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41 count++;
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42 }
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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 int main(int argc, char* argv[])
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49 {
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50 FILE *in, *out;
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51 int **image;
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52 double **image_i;
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53 double **image_d;
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54 int c;
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55 int N;
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56 int coeff_start = 5000, wm_length = 10000, wm_key = 123;
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57 double wm_alpha = 0.2;
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58
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59 pgm_init(&argc, argv); wm_init();
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60
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61 while ((c = getopt(argc, argv, "a:s:l:k:")) != EOF) {
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62 switch (c) {
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63 case 'a':
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64 wm_alpha = atof(optarg);
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65 break;
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66 case 's':
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67 coeff_start = atoi(optarg);
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68 break;
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69 case 'l':
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70 wm_length = atoi(optarg);
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71 break;
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72 case 'k':
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73 wm_key = atoi(optarg);
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74 break;
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75 }
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76 }
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77 argc -= optind;
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78 argv += optind;
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79
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80 in = stdin;
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81 out = stdout;
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82
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83 open_image(in, &width, &height);
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84 image = imatrix(height, width);
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85 load_image(image, in, width, height);
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86
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87 if (height == width)
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88 N = height;
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89 else {
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90 fprintf(stderr, "Cannot Proccess non-square images!\n");
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91 exit( -11);
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92 }
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93
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94 image_i = dmatrix(height, width);
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95 image_d = dmatrix(height, width);
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96 if (image_d == NULL) {
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97 fprintf(stderr, "Unable to allocate the double array\n");
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98 exit(1);
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99 }
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100 matrix_i2d(image, image_i, N);
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101 hartley(image_i, image_d, N);
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102 add_watermark(image_d, N, coeff_start, wm_length, wm_key, wm_alpha);
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103 hartley(image_d, image_i, N);
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104 matrix_d2i(image_i, image, N);
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105 save_image(image, out, width, height);
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106
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107 freematrix_d(image_i, height);
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108 freematrix_d(image_d, height);
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109 fclose(in);
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110 fclose(out);
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111
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112 }
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