Mercurial > hg > wm

comparison Meerwald/wm_koch_d.c @ 0:be303a3f5ea8

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
import
author Peter Meerwald <pmeerw@cosy.sbg.ac.at>
date Sun, 12 Aug 2007 13:14:34 +0200
parents
children f83ef905a63d
comparison
equal deleted inserted replaced
-1:000000000000 0:be303a3f5ea8
1 #include "wm.h"
2 #include "dct.h"
3 #include "signature.h"
4 #include "coord.h"
5 #include "pgm.h"
6
7 char *progname;
8
9 void usage(void) {
10 fprintf(stderr, "usage: %s [-h] [-l n] [-o file] [-q n] [-v n] -s file file\n\n", progname);
11 fprintf(stderr, "\t-h\t\tprint usage\n");
12 fprintf(stderr, "\t-l n\t\tsignature robustness factor\n");
13 fprintf(stderr, "\t-o file\t\textracted signature file\n");
14 fprintf(stderr, "\t-q n\t\tquantization (JPEG quality) factor\n");
15 fprintf(stderr, "\t-s file\t\toriginal signature file\n");
16 fprintf(stderr, "\t-v n\t\tverbosity level\n");
17 exit(0);
18 }
19
20 int main(int argc, char *argv[]) {
21
22 FILE *in = stdin;
23 FILE *out = stdout;
24 FILE *sig = NULL;
25
26 gray **image;
27 struct coords *coords;
28
29 char signature_name[MAXPATHLEN];
30 char input_name[MAXPATHLEN] = "(stdin)";
31 char output_name[MAXPATHLEN] = "(stdout)";
32
33 int i;
34 int j;
35 int c;
36 int n;
37 int x;
38 int y;
39
40 int rows, cols, format;
41 gray maxval;
42 int row, col;
43
44 int seed;
45 int verbose = 0;
46
47 double quality = 0.0;
48 int quantization = 0;
49
50 double **dcts;
51
52 progname = argv[0];
53
54 pgm_init(&argc, argv); wm_init();
55
56 while ((c = getopt(argc, argv, "h?i:l:o:q:s:v:")) != EOF) {
57 switch (c) {
58 case 'h':
59 case '?':
60 usage();
61 break;
62 case 'l':
63 quality = atof(optarg);
64 if (quality <= 0.0) {
65 fprintf(stderr, "%s: signature strength factor %f out of range\n", progname, quality);
66 exit(1);
67 }
68 break;
69 case 'o':
70 if ((out = fopen(optarg, "wb")) == NULL) {
71 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
72 exit(1);
73 }
74 strcpy(output_name, optarg);
75 break;
76 case 'q':
77 quantization = atoi(optarg);
78 if (quantization <= 0 || quantization > 100) {
79 fprintf(stderr, "%s: quantization factor %d out of range\n", progname, quantization);
80 exit(1);
81 }
82 break;
83 case 's':
84 if ((sig = fopen(optarg, "r")) == NULL) {
85 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
86 exit(1);
87 }
88 strcpy(signature_name, optarg);
89 break;
90 case 'v':
91 verbose = atoi(optarg);
92 if (verbose < 0) {
93 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
94 exit(1);
95 }
96 break;
97 }
98 }
99
100 argc -= optind;
101 argv += optind;
102
103 if (argc > 1) {
104 usage();
105 exit(1);
106 }
107
108 if (argc == 1 && *argv[0] != '-')
109 if ((in = fopen(argv[0], "rb")) == NULL) {
110 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
111 exit(1);
112 }
113 else
114 strcpy(input_name, argv[0]);
115
116 if (sig) {
117 char line[128];
118 fgets(line, sizeof(line), sig);
119 if (strspn(line, "KCSG") >= 4) {
120 fscanf(sig, "%d\n", &nbit_signature);
121 n_signature = NBITSTOBYTES(nbit_signature);
122 if (quality == 0.0)
123 fscanf(sig, "%lf\n", &quality);
124 else
125 fscanf(sig, "%*lf\n");
126 if (quantization == 0)
127 fscanf(sig, "%d\n", &quantization);
128 else
129 fscanf(sig, "%*d\n");
130 fscanf(sig, "%d\n", &seed);
131 srandom(seed);
132 fread(signature, sizeof(char), n_signature, sig);
133 init_signature_bits();
134 fscanf(sig, "\n");
135 }
136 else {
137 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
138 exit(1);
139 }
140 fclose(sig);
141 }
142 else {
143 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
144 exit(1);
145 }
146
147 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
148
149 if (cols % NJPEG) {
150 fprintf(stderr, "%s: image width %d not a multiple of %d\n", progname, cols, NJPEG);
151 exit(1);
152 }
153
154 if (rows % NJPEG) {
155 fprintf(stderr, "%s: image height %d not a multiple of %d\n", progname, rows, NJPEG);
156 exit(1);
157 }
158
159 if ((rows * cols) / (NJPEG * NJPEG) < nbit_signature) {
160 fprintf(stderr, "%s: image too small to extract %d bits of signature\n", progname, nbit_signature);
161 exit(1);
162 }
163
164 init_dct_8x8();
165 init_quantum_JPEG_lumin(quantization);
166
167 dcts = alloc_coeffs_8x8();
168
169 if ((coords = alloc_coords(nbit_signature)) == NULL) {
170 fprintf(stderr, "%s: unable to allocate memory\n", progname);
171 exit(1);
172 }
173
174 image = pgm_allocarray(cols, rows);
175
176 for (row = 0; row < rows; row++)
177 pgm_readpgmrow(in, image[row], cols, maxval, format);
178
179 fclose(in);
180
181 n = 0;
182 while (n < nbit_signature) {
183 int xb;
184 int yb;
185 int c1, c2;
186 double v1, v2;
187 double q = 1.0;
188
189 do {
190 xb = random() % (cols / NJPEG);
191 yb = random() % (rows / NJPEG);
192 } while (add_coord(coords, xb, yb) < 0);
193
194 fdct_block_8x8(image, xb * NJPEG, yb * NJPEG, dcts);
195
196 do {
197 c1 = (random() % (NJPEG * NJPEG - 2)) + 1;
198 c2 = (random() % (NJPEG * NJPEG - 2)) + 1;
199 } while (c1 == c2 || !is_middle_frequency_coeff_8x8(c1) || !is_middle_frequency_coeff_8x8(c2));
200
201 quantize_8x8(dcts);
202
203 if (verbose >= 1)
204 fprintf(stderr, "%d: quantized DCT block (x %d/y %d), extracting (x %d/y %d), (x %d/y %d) ", n, xb * NJPEG, yb * NJPEG, c1 % NJPEG, c1 / NJPEG, c2 % NJPEG, c2 / NJPEG);
205
206 v1 = dcts[c1 / NJPEG][c1 % NJPEG];
207 v2 = dcts[c2 / NJPEG][c2 % NJPEG];
208
209 if (fabs(v1) > fabs(v2)) {
210 set_signature_bit(n, 1);
211 if (verbose >= 1)
212 fprintf(stderr, "HIGH\n");
213 }
214 else {
215 set_signature_bit(n, 0);
216 if (verbose >= 1)
217 fprintf(stderr, "LOW\n");
218 }
219
220 if (verbose >= 2)
221 print_coeffs_8x8(dcts);
222
223 n++;
224 }
225
226 fprintf(out, "KCWM\n");
227 fprintf(out, "%d\n", nbit_signature);
228 fwrite(signature, sizeof(char), n_signature, out);
229 fprintf(out, "\n");
230
231 fclose(out);
232
233 free_coeffs(dcts);
234
235 pbm_freearray(image, rows);
236
237 exit(0);
238 }

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