1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/**
* @file debayer.c
* @brief demosaicing algorithms
* @author Patrick Roth - roth@stettbacher.ch
* @copyright Stettbacher Signal Processing AG
*
* @remarks
*
* <PRE>
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* </PRE>
*
*/
#include <stdio.h>
#include "color_pipe_private.h"
/**
* Return bayer pattern type of next line.
*
* @param pattern current pattern type
* @param offset_height height offset in number of lines
* @param offset_width width offset in numbers of rows
* @return pattern type of next line
*/
static inline enum enumBayerPattern_t getBayerType(enum enumBayerPattern_t pattern, int offset_height, int offset_width) {
int offset_y = offset_height%2;
int offset_x = offset_width%2;
if(offset_y == 0 && offset_x == 0) {
// do nothing
}
else if(offset_y == 0 && offset_x == 1) {
if(pattern == BP_GR) {
pattern = BP_RG;
}
else if(pattern == BP_RG) {
pattern = BP_GR;
}
else if(pattern == BP_BG) {
pattern = BP_GB;
}
else if(pattern == BP_GB) {
pattern = BP_BG;
}
}
else if(offset_y == 1 && offset_x == 0) {
if(pattern == BP_GR) {
pattern = BP_BG;
}
else if(pattern == BP_RG) {
pattern = BP_GB;
}
else if(pattern == BP_BG) {
pattern = BP_GR;
}
else if(pattern == BP_GB) {
pattern = BP_RG;
}
}
else if(offset_y == 1 && offset_x == 1) {
if(pattern == BP_GR) {
pattern = BP_GB;
}
else if(pattern == BP_RG) {
pattern = BP_BG;
}
else if(pattern == BP_BG) {
pattern = BP_RG;
}
else if(pattern == BP_GB) {
pattern = BP_GR;
}
}
return pattern;
}
/**
* Calculate RGB value depening on 9 pixel value from bayer pattern.
*
* @param p11 upper left pixel
* @param p12 upper center pixel
* @param p13 upper right pixel
* @param p21 center left pixel
* @param p22 center center pixel
* @param p23 center right pixel
* @param p31 lower left pixel
* @param p32 lower center pixel
* @param p33 lower right pixel
* @param pattern current bayer pattern type, this value is adjusted to next expected type after return
* @param red On return: red pixel value
* @param green On return: green pixel value
* @param blue On return: blue pixel value
*/
static inline void calc_bilinear(int p11, int p12, int p13,
int p21, int p22, int p23,
int p31, int p32, int p33,
enum enumBayerPattern_t *pattern,
int *red, int *green, int *blue) {
switch(*pattern) {
case BP_GR: // green-red-green-red-...
*red = (p21 + p23) >> 1;
*green = (p11 + p13 + p22*4 + p31 + p33) >> 3;
*blue = (p12 + p32) >> 1;
*pattern = BP_RG;
break;
case BP_RG: // red-green-red-green-...
*red = p22;
*green = (p12 + p21 + p23 + p32) >> 2;
*blue = (p11 + p13 + p31 + p33) >> 2;
*pattern = BP_GR;
break;
case BP_BG: // blue-green-blue-green-...
*red = (p11 + p13 + p31 + p33) >> 2;
*green = (p12 + p21 + p23 + p32) >> 2;
*blue = p22;
*pattern = BP_GB;
break;
case BP_GB: // green-blue-green-blue-...
*red = (p12 + p32) >> 1;
*green = (p11 + p13 + p22*4 + p31 + p33) >> 3;
*blue = (p21 + p23) >> 1;
*pattern = BP_BG;
break;
}
}
/**
* Bilinear demosaicing algorithm for RGB image (16 bit per color channel).
*
* @param img_rgb On return: RGB image in R-G-B order
* @param img_bayer bayer image
* @param height image height in number of pixels
* @param width image width in number of pixels
* @param bayer_pattern first pixel starts with this pixel
* @return 0 on success otherwise -1
*/
static void bilinear16(uint16_t *img_rgb, const uint16_t *img_bayer, const int height, const int width, const enum enumBayerPattern_t bayer_pattern)
#include "alg_debayer_bilinear.h"
/**
* Bilinear demosaicing algorithm for RGB image (8 bit per color channel).
*
* @param img_rgb On return: RGB image in R-G-B order
* @param img_bayer bayer image
* @param height image height in number of pixels
* @param width image width in number of pixels
* @param bayer_pattern first pixel starts with this pixel
* @return 0 on success otherwise -1
*/
static void bilinear8(uint8_t *img_rgb, const uint8_t *img_bayer, const int height, const int width, const enum enumBayerPattern_t bayer_pattern)
#include "alg_debayer_bilinear.h"
/**
* Bilinear demosaicing wrapper function used to select pixel-bit-depth dependet algrotihm.
*
* @param img_rgb On return: RGB image in R-G-B order
* @param img_bayer bayer image
* @param height image height in number of pixels
* @param width image width in number of pixels
* @param data_format image data format
* @param bayer_pattern first pixel starts with this pixel
* @return 0 on success otherwise -1
*/
static int bilinear_wrapper(void *img_rgb, const void *img_bayer, const int height, const int width,
const enum enumDataFormat_t data_format, const enum enumBayerPattern_t bayer_pattern) {
if(data_format == DF_RAW_BAYER_8) {
bilinear8(img_rgb, img_bayer, height, width, bayer_pattern);
}
else if(data_format == DF_RAW_BAYER_12 || data_format == DF_HDR_BAYER_20_COMP) {
bilinear16(img_rgb, img_bayer, height, width, bayer_pattern);
}
else {
printf("%s: image data format %d unknown\n", __func__, data_format);
return -1;
}
return 0;
}
/**
* Bayer to RGB image conversion algrithm (demosaicing)
*
* @param debayer_data required data for debayering
* @return 0 on success otherwise -1
*/
int debayer(struct debayer_data_t *debayer_data) {
void *img_rgb, *img_raw;
int ret, height, width;
enum enumDataFormat_t data_format;
enum enumBayerPattern_t bayer_pattern;
enum bayer_alg_t alg;
ret = 0;
img_rgb = debayer_data->img_rgb;
img_raw = debayer_data->img_raw;
height = debayer_data->height;
width = debayer_data->width;
data_format = debayer_data->format;
bayer_pattern = debayer_data->start_pattern;
alg = debayer_data->alg;
if(data_format == DF_RAW_MONO_8 || data_format == DF_RAW_MONO_12 || data_format == DF_HDR_MONO_20_COMP) {
printf("%s: No debayering is done on monochrome image (image data format %d)\n", __func__, data_format);
return -1;
}
switch(alg) {
case BAYER_ALG_BILINEAR:
ret = bilinear_wrapper(img_rgb, img_raw, height, width, data_format, bayer_pattern);
break;
default:
printf("%s: Debayer algorithm %d not implemented yet\n", __func__, alg);
ret = -1;
}
return ret;
}
|
