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1 /* Watermarking program - Subband DCT Transform based */
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2 /* Module : Casting */
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3 /* Author : Vassilis Fotopoulos */
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4 /* Date : 25/4/2000 */
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5 /* Revision : 7.0 */
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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 /* FCT implementation from University of Bath */
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15 /*------------------------------------------------------*/
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16 #include <stdio.h>
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17 #include <stdlib.h>
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18 #include <string.h>
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19 #include <math.h>
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20 #include <float.h>
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21 #include <getopt.h>
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22 #include "common.h"
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13
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23 #include "pgm.h"
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0
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24
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25 void add_hor_add_ver(double **in, int N, double **out);
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26 void add_hor_sub_ver(double **in, int N, double **out);
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27 void sub_hor_add_ver(double **in, int N, double **out);
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28 void sub_hor_sub_ver(double **in, int N, double **out);
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29 void band_synthesis(double **ll, double **lh, double **hl, double **hh, int N, double **s);
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30 void watermark(double **i, int N, long key, long int L, long int M, double a);
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31
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32 double cu[1024];
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33 double cv[1024];
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34 int height, width;
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35
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36 //--------------------------------------------------------
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37 void add_hor_add_ver(double **in, int N, double **out)
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38 {
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39 double **temp;
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40 int r, c;
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41 temp = dmatrix(N, N);
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42 for (r = 0; r < N; r++)
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43 for (c = 0; c < N / 2; c++)
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44 temp[r][c] = (in[r][2 * c] + in[r][2 * c + 1]) / 2;
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45 for (c = 0; c < N / 2; c++)
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46 for (r = 0; r < N / 2; r++)
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47 out[r][c] = (temp[2 * r][c] + temp[2 * r + 1][c]) / 2;
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48 freematrix_d(temp, N);
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49 }
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50 //--------------------------------------------------------
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51 void add_hor_sub_ver(double **in, int N, double **out)
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52 {
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53 double **temp;
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54 int r, c;
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55 temp = dmatrix(N, N);
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56 for (r = 0; r < N; r++)
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57 for (c = 0; c < N / 2; c++)
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58 temp[r][c] = (in[r][2 * c] + in[r][2 * c + 1]) / 2;
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59 for (c = 0; c < N / 2; c++)
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60 for (r = 0; r < N / 2; r++)
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61 out[r][c] = (temp[2 * r][c] - temp[2 * r + 1][c]) / 2;
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62 freematrix_d(temp, N);
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63 }
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64 //--------------------------------------------------------
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65 void sub_hor_add_ver(double **in, int N, double **out)
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66 {
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67 double **temp;
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68 int r, c;
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69 temp = dmatrix(N, N);
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70 for (r = 0; r < N; r++)
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71 for (c = 0; c < N / 2; c++)
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72 temp[r][c] = (in[r][2 * c] - in[r][2 * c + 1]) / 2;
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73 for (c = 0; c < N / 2; c++)
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74 for (r = 0; r < N / 2; r++)
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75 out[r][c] = (temp[2 * r][c] + temp[2 * r + 1][c]) / 2;
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76 freematrix_d(temp, N);
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77 }
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78 //--------------------------------------------------------
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79 void sub_hor_sub_ver(double **in, int N, double **out)
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80 {
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81 double **temp;
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82 int r, c;
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83 temp = dmatrix(N, N);
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84 for (r = 0; r < N; r++)
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85 for (c = 0; c < N / 2; c++)
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86 temp[r][c] = (in[r][2 * c] - in[r][2 * c + 1]) / 2;
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87 for (c = 0; c < N / 2; c++)
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88 for (r = 0; r < N / 2; r++)
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89 out[r][c] = (temp[2 * r][c] - temp[2 * r + 1][c]) / 2;
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90 freematrix_d(temp, N);
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91 }
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92 //--------------------------------------------------------
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93 void band_synthesis(double **ll, double **lh, double **hl, double **hh, int N, double **s)
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94 {
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95 int r, c;
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96 double b1, b2, b3, b4;
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97 for (r = 0; r < N; r++)
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98 for (c = 0; c < N; c++) {
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99 b1 = ll[r][c] + lh[r][c] + hl[r][c] + hh[r][c]; //Reconstruct each
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100 b2 = ll[r][c] + lh[r][c] - hl[r][c] - hh[r][c]; //of the pixels
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101 b3 = ll[r][c] - lh[r][c] + hl[r][c] - hh[r][c];
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102 b4 = ll[r][c] - lh[r][c] - hl[r][c] + hh[r][c];
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103 b1 = (b1 > 255.0) ? 255.0 : b1; //Check for positive...
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104 b1 = (b1 < 0.0) ? 0.0 : b1; //or negative core!
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105 b2 = (b2 > 255.0) ? 255.0 : b2;
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106 b2 = (b2 < 0.0) ? 0.0 : b2;
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107 b3 = (b3 > 255.0) ? 255.0 : b3;
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108 b3 = (b3 < 0.0) ? 0.0 : b3;
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109 b4 = (b4 > 255.0) ? 255.0 : b4;
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110 b4 = (b4 < 0.0) ? 0.0 : b4;
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111 s[2*r][2*c] = b1; //Put them back in
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112 s[2*r][2*c + 1] = b2; //the right position
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113 s[2*r + 1][2*c] = b3;
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114 s[2*r + 1][2*c + 1] = b4;
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115 }
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116 }
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117
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118 void watermark(double **i, int N, long key, long int L, long int M, double a)
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119 {
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120 int row, col, count;
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121 long int elem, temp, seed;
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122 double *v;
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123 v = dvector(N * N);
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124 put_matrix_2_vector(i, v, N);
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125 fct2d(v, N, N);
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126 seed = key;
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127 count = 0;
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128 elem = 0;
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129 row = 2;
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130 col = -1;
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131 do {
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132 do {
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133 row--;
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134 col++;
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135 elem++;
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136 if (col < N) {
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137 if (elem > M) {
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138 temp = row * N + col;
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139 v[temp] += a * fabs(v[temp]) * gasdev(&seed);
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140 count++;
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141 }
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142 }
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143 } while (row > 0);
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144 row = 2 + col;
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145 col = -1;
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146 } while (count < L);
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147 ifct2d(v, N, N);
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148 put_vector_2_matrix(v, i, N);
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149 free(v);
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150 }
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151
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152 int main(int argc, char* argv[])
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153 {
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154 double **i;
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155 double **o;
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156 FILE *in;
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157 FILE *out;
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158 int N;
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159 int c;
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160 long int M1, L1, M2, L2;
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161 int **image_i;
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162 double **ll, **lh, **hl, **hh;
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163 double a_ll = 0.1, a_other = 0.2;
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164 int wm_length_1 = 10000, wm_length_ll = 10000, coeff_start_1 = 3000,
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165 coeff_start_ll = 3000, wm_key = 123;
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166
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167 pgm_init(&argc, argv); wm_init();
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168
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169 while ((c = getopt(argc, argv, "a:b:t:m:s:l:k:")) != EOF) {
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170 switch (c) {
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171 case 'a':
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172 a_ll = atof(optarg);
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173 break;
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174 case 'b':
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175 a_other = atof(optarg);
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176 break;
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177 case 't':
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178 coeff_start_1 = atoi(optarg);
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179 break;
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180 case 'm':
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181 wm_length_1 = atoi(optarg);
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182 break;
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183 case 's':
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184 coeff_start_ll = atoi(optarg);
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185 break;
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186 case 'l':
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187 wm_length_ll = atoi(optarg);
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188 break;
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189 case 'k':
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190 wm_key = atoi(optarg);
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191 break;
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192 }
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193 }
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194 argc -= optind;
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195 argv += optind;
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196
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197 in = stdin;
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198 out = stdout;
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199 open_image(in, &width, &height);
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200 image_i = imatrix(height, width);
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201 load_image(image_i, in, width, height);
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202 if (height == width)
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203 N = height;
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204 else {
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205 fprintf(stderr, "Cannot Proccess non-square images!\n");
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206 exit( -11);
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207 }
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208 // starting coeff. for 1st level decomp.
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209 M1 = coeff_start_1;
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210 // number of coeffs to alter
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211 L1 = wm_length_1;
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212
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213 // now the LL band
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214 M2 = coeff_start_ll;
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215 L2 = wm_length_ll;
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216
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217 i = dmatrix(N, N);
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218 o = dmatrix(N, N);
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219 ll = dmatrix(N / 2, N / 2);
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220 lh = dmatrix(N / 2, N / 2);
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221 hl = dmatrix(N / 2, N / 2);
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222 hh = dmatrix(N / 2, N / 2);
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223
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224 matrix_i2d(image_i, i, N);
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225
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226 //---------------------1o decomposition-------------------
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227 add_hor_add_ver(i, N, ll);
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228 add_hor_sub_ver(i, N, lh);
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229 sub_hor_add_ver(i, N, hl);
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230 sub_hor_sub_ver(i, N, hh);
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231 //---------------------Watermark medium frequency bands---
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232 watermark(lh, N / 2, wm_key, L1, M1, a_other);
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233 watermark(hl, N / 2, wm_key, L1, M1, a_other);
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234 watermark(hh, N / 2, wm_key, L1, M1, a_other);
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235 watermark(ll, N / 2, wm_key, L2, M2, a_ll);
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236 //---------------------Synthesis stage--------------------
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237 band_synthesis(ll, lh, hl, hh, N / 2, o);
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238 //--------------------------------------------------------
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239 matrix_d2i(o, image_i, N);
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240 save_image(image_i, out, width, height);
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241
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242 fclose(in);
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243 fclose(out);
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244
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245 exit(EXIT_SUCCESS);
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246 }
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247
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249
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