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comparison Meerwald-dir/cmp_dct.c @ 24:9f20bce6184e v0.7

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move directories, support netpbm 11
author Peter Meerwald-Stadler <pmeerw@pmeerw.net>
date Fri, 20 Dec 2024 13:08:59 +0100
parents Meerwald/cmp_dct.c@f83ef905a63d
children
comparison
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23:71dd4b96221b 24:9f20bce6184e
1 #include "wm.h"
2 #include "dct.h"
3 #include "gray.h"
4 #include "netpbm/pgm.h"
5
6 char *progname;
7
8 void usage(void) {
9 fprintf(stderr, "usage: %s [-h] [-m n] [-o file] [-pP] -i file file\n\n", progname);
10 fprintf(stderr, "\t-h\t\tprint usage\n");
11 fprintf(stderr, "\t-i file\t\toriginal image file\n");
12 fprintf(stderr, "\t-m n\t\tmultiplication factor (default 16)\n");
13 fprintf(stderr, "\t-o file\t\toutput file\n");
14 fprintf(stderr, "\t-p\t\tprint PSNR, RMS and MSE\n");
15 fprintf(stderr, "\t-P\t\tonly print PSNR, RMS and MSE, no difference image\n");
16 exit(0);
17 }
18
19 int main(int argc, char *argv[]) {
20
21 FILE *in = stdin;
22 FILE *out = stdout;
23 FILE *orig = NULL;
24
25 gray **input_image;
26 gray **orig_image;
27 double **input_dcts;
28 double **orig_dcts;
29 gray **output;
30
31 char output_name[MAXPATHLEN] = "(stdout)";
32 char input_name[MAXPATHLEN] = "(stdin)";
33 char orig_name[MAXPATHLEN];
34
35 int in_cols, in_rows, in_format;
36 gray in_maxval;
37 int orig_cols, orig_rows, orig_format;
38 gray orig_maxval;
39 int cols, rows, format;
40 gray maxval;
41 int col, row;
42
43 int no_orig = 0;
44 int c;
45
46 double error = 0.0;
47 int print_psnr = 0;
48 int print_psnr_only = 0;
49 int m = 16;
50
51 progname = argv[0];
52
53 pgm_init(&argc, argv); wm_init();
54
55 while ((c = getopt(argc, argv, "h?i:m:o:pP")) != EOF) {
56 switch (c) {
57 case 'h':
58 case '?':
59 usage();
60 break;
61 case 'i':
62 if (!strcmp(optarg, "-")) {
63 no_orig = 1;
64 strcpy(orig_name, "(zero)");
65 }
66 else {
67 if ((orig = fopen(optarg, "rb")) == NULL) {
68 fprintf(stderr, "%s: unable to open original image file %s\n", progname, optarg);
69 exit(1);
70 }
71 strcpy(orig_name, optarg);
72 }
73 break;
74 case 'm':
75 m = atoi(optarg);
76 if (m <= 0) {
77 fprintf(stderr, "%s: multiplication factor %d out of range\n", progname, m);
78 exit(1);
79 }
80 break;
81 case 'o':
82 if ((out = fopen(optarg, "wb")) == NULL) {
83 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
84 exit(1);
85 }
86 strcpy(output_name, optarg);
87 break;
88 case 'p':
89 print_psnr = 1;
90 break;
91 case 'P':
92 print_psnr_only = 1;
93 break;
94 }
95 }
96
97 argc -= optind;
98 argv += optind;
99
100 if (argc > 1) {
101 usage();
102 exit(1);
103 }
104
105 if (argc == 1 && *argv[0] != '-') {
106 if ((in = fopen(argv[0], "rb")) == NULL) {
107 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
108 exit(1);
109 }
110 else
111 strcpy(input_name, argv[0]);
112 }
113
114 if (!orig && !no_orig) {
115 fprintf(stderr, "%s: original image file not specified, using zero image\n", progname);
116 strcpy(orig_name, "(zero)");
117 no_orig = 1;
118 }
119
120 pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
121
122 if (!no_orig) {
123 pgm_readpgminit(orig, &orig_cols, &orig_rows, &orig_maxval, &orig_format);
124
125 if (in_cols != orig_cols || in_rows != orig_rows) {
126 fprintf(stderr, "%s: input image %s does not match dimensions of original image %s\n", progname, input_name, orig_name);
127 exit(1);
128 }
129 }
130
131 cols = in_cols;
132 rows = in_rows;
133 format = in_format;
134 maxval = in_maxval;
135
136 input_image = pgm_allocarray(cols, rows);
137 orig_image = pgm_allocarray(cols, rows);
138
139 init_dct_NxN(cols, rows);
140 input_dcts = alloc_coeffs(cols, rows);
141 orig_dcts = alloc_coeffs(cols, rows);
142 output = alloc_grays(cols, rows);
143
144 if (no_orig) {
145 for (row = 0; row < rows; row++) {
146 pgm_readpgmrow(in, input_image[row], cols, maxval, format);
147 bzero(orig_image[row], sizeof(gray) * cols);
148 }
149 }
150 else {
151 for (row = 0; row < rows; row++) {
152 pgm_readpgmrow(in, input_image[row], cols, maxval, format);
153 pgm_readpgmrow(orig, orig_image[row], cols, maxval, format);
154 }
155 }
156
157 fclose(in);
158 if (!no_orig)
159 fclose(orig);
160
161 fdct_NxN(input_image, input_dcts);
162 fdct_NxN(orig_image, orig_dcts);
163
164 for (row = 0; row < rows; row++)
165 for (col = 0; col < cols; col++) {
166 error += sqr(input_dcts[row][col] - orig_dcts[row][col]);
167 output[row][col] = PIXELRANGE(fabs(input_dcts[row][col] - orig_dcts[row][col]) * m);
168 }
169
170 if (!print_psnr_only) {
171 pgm_writepgminit(out, cols, rows, maxval, 0);
172 for (row = 0; row < rows; row++)
173 pgm_writepgmrow(out, output[row], cols, maxval, 0);
174
175 fclose(out);
176 }
177
178 pgm_freearray(input_image, rows);
179 pgm_freearray(orig_image, rows);
180 free_coeffs(input_dcts);
181 free_coeffs(orig_dcts);
182 free_grays(output);
183
184 if (print_psnr || print_psnr_only) {
185 double mse = error / (double) (cols * rows);
186 double rmse = sqrt(mse);
187 double psnr = 20.0 * log(255.0 / rmse) / log(10.0);
188 FILE *print = print_psnr_only ? out : stderr;
189 if (mse > 0.0)
190 fprintf(print, "PSNR: %lf dB\n", psnr);
191 else
192 fprintf(print, "PSNR: inf\n");
193 fprintf(print, "RMS: %lf\n", rmse);
194 fprintf(print, "MSE: %lf\n", mse);
195 }
196
197 exit(0);
198 }

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