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/**
* @file alg_debayer_bilinear.h
* @brief bilinear demosaicing algorithm
* @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>
*
*/
/*
* This code inplements a bilinear demosaicing algorithm and is pixel size independent. Including this code at the
* C-Source file will define the pixel-bit-depth (see debayer.c).
*/
// static void bilinear8(uint8_t *img_rgb, const uint8_t *img_bayer, const int height, const int width, const enum enumBayerPattern_t bayer_pattern)
// static void bilinear16(uint16_t *img_rgb, const uint16_t *img_bayer, const int height, const int width, const enum enumBayerPattern_t bayer_pattern)
{
int x, y, red, green, blue;
int index_rgb, index_upper, index_center, index_lower;
enum enumBayerPattern_t pattern, pattern_nextline;
red = 0;
green = 0;
blue = 0;
pattern_nextline = bayer_pattern;
pattern = bayer_pattern;
/*
* figure out pattern color with coordinate 1/1 (second line / second row)
*/
switch(bayer_pattern) {
case BP_GR: // green-red-green-red-...
pattern = BP_GB;
pattern_nextline = BP_RG;
break;
case BP_RG: // red-green-red-green-...
pattern = BP_BG;
pattern_nextline = BP_GR;
break;
case BP_BG: // blue-green-blue-green-...
pattern = BP_RG;
pattern_nextline = BP_GB;
break;
case BP_GB: // green-blue-green-blue-...
pattern = BP_GR;
pattern_nextline = BP_BG;
break;
}
/*
* loop through image without border area
*/
for(y = 1; y < (height-1); y++) {
// initialize line indices used to reference pixel at 3x3 kernel
index_upper = (y-1)*width;
index_center = y*width;
index_lower = (y+1)*width;
// initialize index used to reference pixel at RGB image
index_rgb = y*width*3+3;
for(x = 1; x < (width-1); x++) {
calc_bilinear(img_bayer[index_upper], img_bayer[index_upper+1], img_bayer[index_upper+2],
img_bayer[index_center], img_bayer[index_center+1], img_bayer[index_center+2],
img_bayer[index_lower], img_bayer[index_lower+1], img_bayer[index_lower+2],
&pattern, &red, &green, &blue);
img_rgb[index_rgb] = red;
img_rgb[index_rgb+1] = green;
img_rgb[index_rgb+2] = blue;
index_rgb += 3;
index_upper++;
index_center++;
index_lower++;
}
pattern = pattern_nextline;
pattern_nextline = getBayerType(pattern, 1, 0);
}
/*
* handle pixels at horizontal upper border line
*/
pattern = getBayerType(bayer_pattern, 0, 1);
index_center = 0;
index_upper = width;
index_lower = width;
index_rgb = 3;
for(x = 1; x < (width-1); x++) {
calc_bilinear(img_bayer[index_upper], img_bayer[index_upper+1], img_bayer[index_upper+2],
img_bayer[index_center], img_bayer[index_center+1], img_bayer[index_center+2],
img_bayer[index_lower], img_bayer[index_lower+1], img_bayer[index_lower+2],
&pattern, &red, &green, &blue);
img_rgb[index_rgb] = red;
img_rgb[index_rgb+1] = green;
img_rgb[index_rgb+2] = blue;
index_rgb += 3;
index_upper++;
index_center++;
index_lower++;
}
/*
* handle pixels at horizontal lower border line
*/
pattern = getBayerType(bayer_pattern, height-1, 1);
index_center = (height-1)*width;
index_upper = index_center-width;
index_lower = index_center-width;
index_rgb = ((height-1)*width*3)+3;
for(x = 1; x < (width-1); x++) {
calc_bilinear(img_bayer[index_upper], img_bayer[index_upper+1], img_bayer[index_upper+2],
img_bayer[index_center], img_bayer[index_center+1], img_bayer[index_center+2],
img_bayer[index_lower], img_bayer[index_lower+1], img_bayer[index_lower+2],
&pattern, &red, &green, &blue);
img_rgb[index_rgb] = red;
img_rgb[index_rgb+1] = green;
img_rgb[index_rgb+2] = blue;
index_rgb += 3;
index_upper++;
index_center++;
index_lower++;
}
/*
* handle pixels at vertical left border line
*/
index_upper = 0;
index_center = width;
index_lower = 2*width;
index_rgb = width*3;
for(y = 1; y < (height-1); y++) {
pattern = getBayerType(bayer_pattern, y, 0);
calc_bilinear(img_bayer[index_upper+1], img_bayer[index_upper], img_bayer[index_upper+1],
img_bayer[index_center+1], img_bayer[index_center], img_bayer[index_center+1],
img_bayer[index_lower+1], img_bayer[index_lower], img_bayer[index_lower+1],
&pattern, &red, &green, &blue);
img_rgb[index_rgb] = red;
img_rgb[index_rgb+1] = green;
img_rgb[index_rgb+2] = blue;
index_rgb += 3*width;
index_upper += width;
index_center += width;
index_lower += width;
}
/*
* handle pixels at vertical right border line
*/
index_upper = width-2;
index_center = index_upper+width;
index_lower = index_upper+2*width;
index_rgb = width*3*2-3;
for(y = 1; y < (height-1); y++) {
pattern = getBayerType(bayer_pattern, y, width-1);
calc_bilinear(img_bayer[index_upper], img_bayer[index_upper+1], img_bayer[index_upper],
img_bayer[index_center], img_bayer[index_center+1], img_bayer[index_center],
img_bayer[index_lower], img_bayer[index_lower+1], img_bayer[index_lower],
&pattern, &red, &green, &blue);
img_rgb[index_rgb] = red;
img_rgb[index_rgb+1] = green;
img_rgb[index_rgb+2] = blue;
index_rgb += 3*width;
index_upper += width;
index_center += width;
index_lower += width;
}
/*
* Handle upper left corner
*/
pattern = getBayerType(bayer_pattern, 0, 0);
index_upper = width;
index_lower = width;
calc_bilinear(img_bayer[index_upper+1], img_bayer[index_upper], img_bayer[index_upper+1],
img_bayer[1], img_bayer[0], img_bayer[1],
img_bayer[index_lower+1], img_bayer[index_lower], img_bayer[index_lower+1],
&pattern, &red, &green, &blue);
img_rgb[0] = red;
img_rgb[1] = green;
img_rgb[2] = blue;
/*
* Handle upper right corner
*/
pattern = getBayerType(bayer_pattern, 0, width-1);
index_upper = 2*width-2;
index_center = width-2;
index_lower = 2*width-2;
calc_bilinear(img_bayer[index_upper], img_bayer[index_upper+1], img_bayer[index_upper],
img_bayer[index_center], img_bayer[index_center+1], img_bayer[index_center],
img_bayer[index_lower], img_bayer[index_lower+1], img_bayer[index_lower],
&pattern, &red, &green, &blue);
index_rgb = 3*width-3;
img_rgb[index_rgb] = red;
img_rgb[index_rgb+1] = green;
img_rgb[index_rgb+2] = blue;
/*
* Handle lower left corner
*/
pattern = getBayerType(bayer_pattern, height-1, 0);
index_upper = (height-2)*width;
index_center = (height-1)*width;
index_lower = (height-2)*width;
calc_bilinear(img_bayer[index_upper+1], img_bayer[index_upper], img_bayer[index_upper+1],
img_bayer[index_center+1], img_bayer[index_center], img_bayer[index_center+1],
img_bayer[index_lower+1], img_bayer[index_lower], img_bayer[index_lower+1],
&pattern, &red, &green, &blue);
index_rgb = ((height-1)*width)*3;
img_rgb[index_rgb] = red;
img_rgb[index_rgb+1] = green;
img_rgb[index_rgb+2] = blue;
/*
* Handle lower right corner
*/
pattern = getBayerType(bayer_pattern, height-1, width-1);
index_upper = (height-2)*width-2;
index_center = (height-1)*width-2;
index_lower = (height-2)*width-2;
calc_bilinear(img_bayer[index_upper], img_bayer[index_upper+1], img_bayer[index_upper],
img_bayer[index_center], img_bayer[index_center+1], img_bayer[index_center],
img_bayer[index_lower], img_bayer[index_lower+1], img_bayer[index_lower],
&pattern, &red, &green, &blue);
index_rgb = height*width*3-3;
img_rgb[index_rgb] = red;
img_rgb[index_rgb+1] = green;
img_rgb[index_rgb+2] = blue;
}
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