comparison Fotopoulos-dir/cast-sub.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-sub.c@cbecc570129d
children
comparison
equal deleted inserted replaced
23:71dd4b96221b 24:9f20bce6184e
1 /* Watermarking program - Subband DCT Transform based */
2 /* Module : Casting */
3 /* Author : Vassilis Fotopoulos */
4 /* Date : 25/4/2000 */
5 /* Revision : 7.0 */
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 /* FCT implementation from University of Bath */
15 /*------------------------------------------------------*/
16 #include <stdio.h>
17 #include <stdlib.h>
18 #include <string.h>
19 #include <math.h>
20 #include <float.h>
21 #include <getopt.h>
22 #include "common.h"
23 #include "netpbm/pgm.h"
24
25 void add_hor_add_ver(double **in, int N, double **out);
26 void add_hor_sub_ver(double **in, int N, double **out);
27 void sub_hor_add_ver(double **in, int N, double **out);
28 void sub_hor_sub_ver(double **in, int N, double **out);
29 void band_synthesis(double **ll, double **lh, double **hl, double **hh, int N, double **s);
30 void watermark(double **i, int N, long key, long int L, long int M, double a);
31
32 double cu[1024];
33 double cv[1024];
34 int height, width;
35
36 //--------------------------------------------------------
37 void add_hor_add_ver(double **in, int N, double **out)
38 {
39 double **temp;
40 int r, c;
41 temp = dmatrix(N, N);
42 for (r = 0; r < N; r++)
43 for (c = 0; c < N / 2; c++)
44 temp[r][c] = (in[r][2 * c] + in[r][2 * c + 1]) / 2;
45 for (c = 0; c < N / 2; c++)
46 for (r = 0; r < N / 2; r++)
47 out[r][c] = (temp[2 * r][c] + temp[2 * r + 1][c]) / 2;
48 freematrix_d(temp, N);
49 }
50 //--------------------------------------------------------
51 void add_hor_sub_ver(double **in, int N, double **out)
52 {
53 double **temp;
54 int r, c;
55 temp = dmatrix(N, N);
56 for (r = 0; r < N; r++)
57 for (c = 0; c < N / 2; c++)
58 temp[r][c] = (in[r][2 * c] + in[r][2 * c + 1]) / 2;
59 for (c = 0; c < N / 2; c++)
60 for (r = 0; r < N / 2; r++)
61 out[r][c] = (temp[2 * r][c] - temp[2 * r + 1][c]) / 2;
62 freematrix_d(temp, N);
63 }
64 //--------------------------------------------------------
65 void sub_hor_add_ver(double **in, int N, double **out)
66 {
67 double **temp;
68 int r, c;
69 temp = dmatrix(N, N);
70 for (r = 0; r < N; r++)
71 for (c = 0; c < N / 2; c++)
72 temp[r][c] = (in[r][2 * c] - in[r][2 * c + 1]) / 2;
73 for (c = 0; c < N / 2; c++)
74 for (r = 0; r < N / 2; r++)
75 out[r][c] = (temp[2 * r][c] + temp[2 * r + 1][c]) / 2;
76 freematrix_d(temp, N);
77 }
78 //--------------------------------------------------------
79 void sub_hor_sub_ver(double **in, int N, double **out)
80 {
81 double **temp;
82 int r, c;
83 temp = dmatrix(N, N);
84 for (r = 0; r < N; r++)
85 for (c = 0; c < N / 2; c++)
86 temp[r][c] = (in[r][2 * c] - in[r][2 * c + 1]) / 2;
87 for (c = 0; c < N / 2; c++)
88 for (r = 0; r < N / 2; r++)
89 out[r][c] = (temp[2 * r][c] - temp[2 * r + 1][c]) / 2;
90 freematrix_d(temp, N);
91 }
92 //--------------------------------------------------------
93 void band_synthesis(double **ll, double **lh, double **hl, double **hh, int N, double **s)
94 {
95 int r, c;
96 double b1, b2, b3, b4;
97 for (r = 0; r < N; r++)
98 for (c = 0; c < N; c++) {
99 b1 = ll[r][c] + lh[r][c] + hl[r][c] + hh[r][c]; //Reconstruct each
100 b2 = ll[r][c] + lh[r][c] - hl[r][c] - hh[r][c]; //of the pixels
101 b3 = ll[r][c] - lh[r][c] + hl[r][c] - hh[r][c];
102 b4 = ll[r][c] - lh[r][c] - hl[r][c] + hh[r][c];
103 b1 = (b1 > 255.0) ? 255.0 : b1; //Check for positive...
104 b1 = (b1 < 0.0) ? 0.0 : b1; //or negative core!
105 b2 = (b2 > 255.0) ? 255.0 : b2;
106 b2 = (b2 < 0.0) ? 0.0 : b2;
107 b3 = (b3 > 255.0) ? 255.0 : b3;
108 b3 = (b3 < 0.0) ? 0.0 : b3;
109 b4 = (b4 > 255.0) ? 255.0 : b4;
110 b4 = (b4 < 0.0) ? 0.0 : b4;
111 s[2*r][2*c] = b1; //Put them back in
112 s[2*r][2*c + 1] = b2; //the right position
113 s[2*r + 1][2*c] = b3;
114 s[2*r + 1][2*c + 1] = b4;
115 }
116 }
117
118 void watermark(double **i, int N, long key, long int L, long int M, double a)
119 {
120 int row, col, count;
121 long int elem, temp, seed;
122 double *v;
123 v = dvector(N * N);
124 put_matrix_2_vector(i, v, N);
125 fct2d(v, N, N);
126 seed = key;
127 count = 0;
128 elem = 0;
129 row = 2;
130 col = -1;
131 do {
132 do {
133 row--;
134 col++;
135 elem++;
136 if (col < N) {
137 if (elem > M) {
138 temp = row * N + col;
139 v[temp] += a * fabs(v[temp]) * gasdev(&seed);
140 count++;
141 }
142 }
143 } while (row > 0);
144 row = 2 + col;
145 col = -1;
146 } while (count < L);
147 ifct2d(v, N, N);
148 put_vector_2_matrix(v, i, N);
149 free(v);
150 }
151
152 int main(int argc, char* argv[])
153 {
154 double **i;
155 double **o;
156 FILE *in;
157 FILE *out;
158 int N;
159 int c;
160 long int M1, L1, M2, L2;
161 int **image_i;
162 double **ll, **lh, **hl, **hh;
163 double a_ll = 0.1, a_other = 0.2;
164 int wm_length_1 = 10000, wm_length_ll = 10000, coeff_start_1 = 3000,
165 coeff_start_ll = 3000, wm_key = 123;
166
167 pgm_init(&argc, argv); wm_init();
168
169 while ((c = getopt(argc, argv, "a:b:t:m:s:l:k:")) != EOF) {
170 switch (c) {
171 case 'a':
172 a_ll = atof(optarg);
173 break;
174 case 'b':
175 a_other = atof(optarg);
176 break;
177 case 't':
178 coeff_start_1 = atoi(optarg);
179 break;
180 case 'm':
181 wm_length_1 = atoi(optarg);
182 break;
183 case 's':
184 coeff_start_ll = atoi(optarg);
185 break;
186 case 'l':
187 wm_length_ll = atoi(optarg);
188 break;
189 case 'k':
190 wm_key = atoi(optarg);
191 break;
192 }
193 }
194 argc -= optind;
195 argv += optind;
196
197 in = stdin;
198 out = stdout;
199 open_image(in, &width, &height);
200 image_i = imatrix(height, width);
201 load_image(image_i, in, width, height);
202 if (height == width)
203 N = height;
204 else {
205 fprintf(stderr, "Cannot Proccess non-square images!\n");
206 exit( -11);
207 }
208 // starting coeff. for 1st level decomp.
209 M1 = coeff_start_1;
210 // number of coeffs to alter
211 L1 = wm_length_1;
212
213 // now the LL band
214 M2 = coeff_start_ll;
215 L2 = wm_length_ll;
216
217 i = dmatrix(N, N);
218 o = dmatrix(N, N);
219 ll = dmatrix(N / 2, N / 2);
220 lh = dmatrix(N / 2, N / 2);
221 hl = dmatrix(N / 2, N / 2);
222 hh = dmatrix(N / 2, N / 2);
223
224 matrix_i2d(image_i, i, N);
225
226 //---------------------1o decomposition-------------------
227 add_hor_add_ver(i, N, ll);
228 add_hor_sub_ver(i, N, lh);
229 sub_hor_add_ver(i, N, hl);
230 sub_hor_sub_ver(i, N, hh);
231 //---------------------Watermark medium frequency bands---
232 watermark(lh, N / 2, wm_key, L1, M1, a_other);
233 watermark(hl, N / 2, wm_key, L1, M1, a_other);
234 watermark(hh, N / 2, wm_key, L1, M1, a_other);
235 watermark(ll, N / 2, wm_key, L2, M2, a_ll);
236 //---------------------Synthesis stage--------------------
237 band_synthesis(ll, lh, hl, hh, N / 2, o);
238 //--------------------------------------------------------
239 matrix_d2i(o, image_i, N);
240 save_image(image_i, out, width, height);
241
242 fclose(in);
243 fclose(out);
244
245 exit(EXIT_SUCCESS);
246 }
247
248
249
250

Repositories maintained by Peter Meerwald, pmeerw@pmeerw.net.