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1 /* Watermarking program - Fast Cosine Transform based */
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2 /* Module : Casting */
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3 /* Author : Vassilis Fotopoulos */
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4 /* Date : 21/7/1999 */
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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 /* (without Visual Masking) */
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12 /*------------------------------------------------------*/
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13 /* pseudorandom noise generator's code is */
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14 /* taken from "Numerical Recipes in C" */
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15 /* FCT implementation from the University of Bath */
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16 /*------------------------------------------------------*/
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17 #include <stdio.h>
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18 #include <stdlib.h>
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19 #include <string.h>
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20 #include <math.h>
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21 #include <float.h>
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22 #include <getopt.h>
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23 #include "common.h"
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24
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25 double cu[1024];
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26 double cv[1024];
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27 int height, width;
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28
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29 //--------------------------------------------------------
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30 void add_watermark(double *in, int N, int coeff_start, int wm_length, int wm_key, double wm_alpha)
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31 {
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32 int row, col, count;
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33 long int elem, L, M, temp, seed;
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34 double a;
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35 count = 0;
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36 elem = 0;
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37 row = 2;
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38 col = -1;
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39 M = coeff_start;
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40 L = wm_length;
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41 seed = wm_key;
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42 a = wm_alpha;
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43 do {
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44 do {
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45 row--;
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46 col++;
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47 elem++;
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48 if (col < N) {
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49 if (elem > M) {
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50 temp = row * N + col;
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51 in[temp] += a * fabs(in[temp]) * gasdev(&seed);
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52 count++;
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53 }
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54 }
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55 } while (row > 0);
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56 row = 2 + col;
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57 col = -1;
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58 } while (count < L);
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59 }
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60 //--------------------------------------------------------
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61 void initialize_constants(void)
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62 {
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63 int i;
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64 cu[0] = cv[0] = 0.7071068;
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65 for (i = 1; i < 1024; i++)
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66 cu[i] = cv[i] = 1.0;
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67 }
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68
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69 //--------------------------------------------------------
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70 int main(int argc, char* argv[])
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71 {
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72 FILE *in, *out;
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73 int **image_i;
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74 double *image_f = NULL;
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75 int N;
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76 int c;
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77 int coeff_start = 5000, wm_length = 10000, wm_key = 123;
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78 double wm_alpha = 0.2;
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79
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80 pgm_init(&argc, argv); wm_init();
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81
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82 while ((c = getopt(argc, argv, "a:s:l:k:")) != EOF) {
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83 switch (c) {
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84 case 'a':
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85 wm_alpha = atof(optarg);
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86 break;
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87 case 's':
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88 coeff_start = atoi(optarg);
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89 break;
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90 case 'l':
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91 wm_length = atoi(optarg);
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92 break;
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93 case 'k':
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94 wm_key = atoi(optarg);
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95 break;
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96 }
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97 }
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98 argc -= optind;
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99 argv += optind;
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100
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101 in = stdin;
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102 out = stdout;
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103
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104 open_image(in, &width, &height);
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105 image_i = imatrix(height, width);
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106 load_image(image_i, in, width, height);
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107
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108 if (height == width)
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109 N = height;
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110 else {
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111 fprintf(stderr, "Cannot Proccess non-square images!\n");
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112 exit( -11);
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113 }
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114
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115 initialize_constants();
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116 image_f = (double *)calloc(N * N, sizeof(double));
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117 if (image_f == NULL) {
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118 printf("Unable to allocate the float array\n");
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119 exit(1);
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120 }
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121
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122 put_image_from_int_2_double(image_i, image_f, N);
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123 fct2d(image_f, N, N);
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124 add_watermark(image_f, N, coeff_start, wm_length, wm_key, wm_alpha);
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125 ifct2d(image_f, N, N);
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126 put_image_from_double_2_int(image_f, image_i, N);
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127 save_image(image_i, out, width, height);
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128 freematrix(image_i, height);
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129 free(image_f);
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130 fclose(in);
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131 fclose(out);
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132 }
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