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comparison Fotopoulos/cast-pv.c @ 0:be303a3f5ea8

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author Peter Meerwald <pmeerw@cosy.sbg.ac.at>
date Sun, 12 Aug 2007 13:14:34 +0200
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children cbecc570129d
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-1:000000000000 0:be303a3f5ea8
1 /* Watermarking program - Fast Cosine Transform based */
2 /* Module : Casting */
3 /* Author : Vassilis Fotopoulos */
4 /* Date : 21/7/1999 */
5 /* Revision : 2.01a */
6 /* Developed at : ELLAB */
7 /* Electronics Laboratory */
8 /* Department of Physics */
9 /* University of Patras - GREECE */
10 /* Copyleft (c) 1999 */
11 /* (without Visual Masking) */
12 /*------------------------------------------------------*/
13 /* pseudorandom noise generator's code is */
14 /* taken from "Numerical Recipes in C" */
15 /* FCT implementation from the University of Bath */
16 /*------------------------------------------------------*/
17 #include <stdio.h>
18 #include <stdlib.h>
19 #include <string.h>
20 #include <math.h>
21 #include <float.h>
22 #include <getopt.h>
23 #include "common.h"
24
25 double cu[1024];
26 double cv[1024];
27 int height, width;
28
29 //--------------------------------------------------------
30 void add_watermark(double *in, int N, int coeff_start, int wm_length, int wm_key, double wm_alpha)
31 {
32 int row, col, count;
33 long int elem, L, M, temp, seed;
34 double a;
35 count = 0;
36 elem = 0;
37 row = 2;
38 col = -1;
39 M = coeff_start;
40 L = wm_length;
41 seed = wm_key;
42 a = wm_alpha;
43 do {
44 do {
45 row--;
46 col++;
47 elem++;
48 if (col < N) {
49 if (elem > M) {
50 temp = row * N + col;
51 in[temp] += a * fabs(in[temp]) * gasdev(&seed);
52 count++;
53 }
54 }
55 } while (row > 0);
56 row = 2 + col;
57 col = -1;
58 } while (count < L);
59 }
60 //--------------------------------------------------------
61 void initialize_constants(void)
62 {
63 int i;
64 cu[0] = cv[0] = 0.7071068;
65 for (i = 1; i < 1024; i++)
66 cu[i] = cv[i] = 1.0;
67 }
68
69 //--------------------------------------------------------
70 int main(int argc, char* argv[])
71 {
72 FILE *in, *out;
73 int **image_i;
74 double *image_f = NULL;
75 int N;
76 int c;
77 int coeff_start = 5000, wm_length = 10000, wm_key = 123;
78 double wm_alpha = 0.2;
79
80 pgm_init(&argc, argv); wm_init();
81
82 while ((c = getopt(argc, argv, "a:s:l:k:")) != EOF) {
83 switch (c) {
84 case 'a':
85 wm_alpha = atof(optarg);
86 break;
87 case 's':
88 coeff_start = atoi(optarg);
89 break;
90 case 'l':
91 wm_length = atoi(optarg);
92 break;
93 case 'k':
94 wm_key = atoi(optarg);
95 break;
96 }
97 }
98 argc -= optind;
99 argv += optind;
100
101 in = stdin;
102 out = stdout;
103
104 open_image(in, &width, &height);
105 image_i = imatrix(height, width);
106 load_image(image_i, in, width, height);
107
108 if (height == width)
109 N = height;
110 else {
111 fprintf(stderr, "Cannot Proccess non-square images!\n");
112 exit( -11);
113 }
114
115 initialize_constants();
116 image_f = (double *)calloc(N * N, sizeof(double));
117 if (image_f == NULL) {
118 printf("Unable to allocate the float array\n");
119 exit(1);
120 }
121
122 put_image_from_int_2_double(image_i, image_f, N);
123 fct2d(image_f, N, N);
124 add_watermark(image_f, N, coeff_start, wm_length, wm_key, wm_alpha);
125 ifct2d(image_f, N, N);
126 put_image_from_double_2_int(image_f, image_i, N);
127 save_image(image_i, out, width, height);
128 freematrix(image_i, height);
129 free(image_f);
130 fclose(in);
131 fclose(out);
132 }

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