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/*
* STV0680 Vision Camera Chipset Driver
* Copyright (C) 2000 Adam Harrison <adam@antispin.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <math.h>
#include "bayer.h"
/* Enhanced by Kurt Garloff to do scaling and debayering at the same time. */
void bayer_unshuffle_preview(int w, int h, int scale, unsigned char *raw, unsigned char *output)
{
int x, y, nx, ny;
int colour; int rgb[3];
int nw = w >> scale;
int nh = h >> scale;
int incr = 1<<scale;
for (ny = 0; ny < nh; ++ny, raw += w<<scale) {
for (nx = 0; nx < nw; ++nx, output += 3) {
rgb[0] = 0; rgb[1] = 0; rgb[2] = 0;
for (y = 0; y < incr; ++y) {
for (x = 0; x < incr; ++x) {
colour = 1 - (x&1) + (y&1);
rgb[colour] += raw[y*w + (nx<<(scale-1))+(x>>1) + ((x&1)? 0: (w>>1))];
}
}
output[0] = rgb[0]>>(2*scale-2);
output[1] = rgb[1]>>(2*scale-1);
output[2] = rgb[2]>>(2*scale-2);
}
}
}
/****** gamma correction from trans[], plus hardcoded white balance */
/* Thanks to Alexander Schwartx <alexander.schwartx@gmx.net> for this code.
Gamma correction (trans[] values generated by (pow((i-17)/256, GAMMA)*255)
where GAMMA=0.5, 1<i<255. */
#define GAMMA 0.540
#define ZERO 16.0
void light_enhance(int vw, int vh, int coarse, int fine, unsigned char *output)
{
unsigned long int i;
int lt=3; /* 3 is auto */
float wb[3][3];
double x, y;
unsigned int trans[258], v;
int tmp1, tmp2, tmp3, whitex=20, whitey=20, j, k;
double brightness = 1.0; /* FIXME: configurable? */
/*fprintf(stderr, "(FineExp=%i CoarseExp=%i => filter=", fine, coarse); */
if (fine >= (coarse<<1)) {
lt = 0;
/*fprintf(stderr, "natural)\n");*/
} else if (((fine<<1) < coarse) && (coarse < 400)) {
lt = 2;
/*fprintf(stderr, "incandescent)\n");*/
} else {
lt = 1;
/*fprintf(stderr, "fluorescent)\n");*/
}
x = brightness;
wb[0][0] = 1.08 * x; wb[0][1] = 1.00 * x; wb[0][2] = 0.95 * x;
wb[1][0] = 1.05 * x; wb[1][1] = 1.00 * x; wb[1][2] = 1.00 * x;
wb[2][0] = 0.90 * x; wb[2][1] = 1.00 * x; wb[2][2] = 1.10 * x;
/* find white pixel */
for (j=0;j<vh;j++)
{
for (k=0; k<vw; k++)
{
i = (j*vw + k)*3;
tmp1 = abs(*(output+i) - *(output+i+1));
tmp2 = abs(*(output+i) - *(output+i+2));
tmp3 = abs(*(output+i+1) - *(output+i+2));
if ((tmp1<20) && (tmp2<20) && (tmp3<20) && (*(output+i)>100)) {
whitex = k; whitey = j;
break;
}
}
}
for(i=1; i<256; ++i)
{
x=i; x -= ZERO;
if (x<1.0)
x = 1.0;
y = pow((x/256.0),GAMMA)*255.0;
trans[i] = (unsigned int) y;
}
trans[0] = 0;
for (i=0;i<(vw*vh*3);i+=3)
{ /* this (adjusting white) isn't quite right yet, so I turned it off */
if ( (abs(*(output+i)-*(output+i+1))<1) &&
(abs(*(output+i)-*(output+i+2))<1) &&
(abs(*(output+i+1)-*(output+i+2))<1)) {
y = trans[*(output+i)]*wb[lt][1]; v = (unsigned int)y;
v = (v > 255) ? 255 : v;
*(output+i) = (unsigned char) (v);
*(output+i+1) = (unsigned char) (v);
*(output+i+2) = (unsigned char) (v);
// fprintf(stdout,"Adjusting white\n");
} else { /* this is OK */
y = trans[*(output+i)]*wb[lt][0]; v = (unsigned int)y;
*(output+i) = (unsigned char) (v > 255) ? 255 : v;
y = trans[*(output+i+1)]*wb[lt][1]; v = (unsigned int)y;
*(output+i+1) = (unsigned char) (v > 255) ? 255 : v;
y = trans[*(output+i+2)]*wb[lt][2]; v = (unsigned int)y;
*(output+i+2) = (unsigned char) (v > 255) ? 255 : v;
}
} /* for */
} /* light_enhance */
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