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/* jd350e.c
*
* White balancing and brightness correction for the Jenoptik
* JD350 entrance camera
*
* Copyright © 2001 Michael Trawny <trawny99@users.sourceforge.net>
*
* 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 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <gphoto2/gphoto2-library.h>
#include <gphoto2/gphoto2-port-log.h>
#include "jd350e.h"
#include "jd350e_red.h"
/*#include "jd350e_blue.h"*/
#define GP_MODULE "jd350e"
#define THRESHOLD 0xf8
#define RED(p,x,y,w) *((p)+3*((y)*(w)+(x)) )
#define GREEN(p,x,y,w) *((p)+3*((y)*(w)+(x))+1)
#define BLUE(p,x,y,w) *((p)+3*((y)*(w)+(x))+2)
#define SWAP(a,b) {unsigned char t=(a); (a)=(b); (b)=t;}
#define MINMAX(a,min,max) { (min)=MIN(min,a); (max)=MAX(max,a); }
#ifndef MAX
# define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
#ifndef MIN
# define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
int jd350e_postprocessing(int width, int height, unsigned char* rgb){
int
x,y,
red_min=255, red_max=0,
blue_min=255, blue_max=0,
green_min=255, green_max=0;
double
min, max, amplify;
/* reverse image row by row... */
for( y=0; y<height; y++){
for( x=0; x<width/2; x++ ){
SWAP( RED(rgb,x,y,width), RED(rgb,width-x-1,y,width));
SWAP( GREEN(rgb,x,y,width), GREEN(rgb,width-x-1,y,width));
SWAP( BLUE(rgb,x,y,width), BLUE(rgb,width-x-1,y,width));
}
}
/* determine min and max per color... */
for( y=0; y<height; y++){
for( x=0; x<width; x++ ){
MINMAX( RED(rgb,x,y,width), red_min, red_max );
MINMAX( GREEN(rgb,x,y,width), green_min, green_max);
MINMAX( BLUE(rgb,x,y,width), blue_min, blue_max );
}
}
/* white balancing ... */
/* here is still some work to do: either blue or red */
/* pixles need to be emphasized. */
/* but how can the driver decide? */
#if 0
if( (green_max+blue_max)/2 > red_max ){
#endif
/* outdoor daylight : red color correction curve*/
GP_DEBUG( "daylight mode");
for( y=0; y<height; y++){
for( x=0; x<width; x++ ){
RED(rgb,x,y,width) = jd350e_red_curve[ RED(rgb,x,y,width) ];
/* RED(rgb,x,y,width) = MIN(2*(unsigned)RED(rgb,x,y,width),255); */
}
}
red_min = jd350e_red_curve[ red_min ];
red_max = jd350e_red_curve[ red_max ];
/* red_min = MIN(2*(unsigned)red_min,255); */
/* red_max = MIN(2*(unsigned)red_max,255); */
#if 0
}
else if( (green_max+red_max)/2 > blue_max ){
/* indoor electric light */
GP_DEBUG( "electric light mode");
for( y=0; y<height; y++){
for( x=0; x<width; x++ ){
BLUE(rgb,x,y,width) = MIN(2*(unsigned)BLUE(rgb,x,y,width),255);
}
}
blue_min = MIN(2*(unsigned)blue_min,255);
blue_max = MIN(2*(unsigned)blue_max,255);
}
#endif
/* Normalize brightness ... */
max = MAX( MAX( red_max, green_max ), blue_max);
min = MIN( MIN( red_min, green_min ), blue_min);
amplify = 255.0/(max-min);
for( y=0; y<height; y++){
for( x=0; x<width; x++ ){
RED(rgb,x,y,width)= MIN(amplify*(double)(RED(rgb,x,y,width)-min),255);
GREEN(rgb,x,y,width)= MIN(amplify*(double)(GREEN(rgb,x,y,width)-min),255);
BLUE(rgb,x,y,width)= MIN(amplify*(double)(BLUE(rgb,x,y,width)-min),255);
}
}
return GP_OK;
}
int jd350e_postprocessing_and_flip(int width, int height, unsigned char* rgb){
char *tmpline;
int y, ret;
ret = jd350e_postprocessing (width,height,rgb);
if (ret < GP_OK)
return ret;
tmpline = malloc(width*3);
if (!tmpline)
return GP_ERROR_NO_MEMORY;
for( y=0; y<height/2; y++){
memcpy (tmpline, rgb+y*width*3, width*3);
memcpy (rgb+y*width*3, rgb+(height-y-1)*width*3, width*3);
memcpy (rgb+(height-y-1)*width*3, tmpline, width*3);
}
free(tmpline);
return GP_OK;
}
int trust350fs_postprocessing(int width, int height, unsigned char* rgb) {
int i,x,y,min=255,max=0;
double amplify;
unsigned char *buf;
const int brightness_adjust = 16;
/* flip horizontal */
#define RED(p,x,y,w) *((p)+3*((y)*(w)+(x)) )
#define GREEN(p,x,y,w) *((p)+3*((y)*(w)+(x))+1)
#define BLUE(p,x,y,w) *((p)+3*((y)*(w)+(x))+2)
#define SWAP(a,b) {unsigned char t=(a); (a)=(b); (b)=t;}
for( y=0; y<height; y++){
for( x=0; x<width/2; x++ ){
SWAP( RED(rgb,x,y,width), RED(rgb,width-x-1,y,width));
SWAP( GREEN(rgb,x,y,width), GREEN(rgb,width-x-1,y,width));
SWAP( BLUE(rgb,x,y,width), BLUE(rgb,width-x-1,y,width));
}
}
/* flip vertical */
buf = malloc(width*3);
if (!buf) return GP_ERROR_NO_MEMORY;
for (i=0;i<height/2;i++) {
memcpy(buf,rgb+i*width*3,width*3);
memcpy(rgb+i*width*3,rgb+(height-i-1)*width*3,width*3);
memcpy(rgb+(height-i-1)*width*3,buf,width*3);
}
free(buf);
/* Normalize & adjust brightness ... */
#define MINMAX(a,min,max) { (min)=MIN(min,a); (max)=MAX(max,a); }
#ifndef MAX
# define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
#ifndef MIN
# define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
for(i=0; i<(width*height*3); i++)
MINMAX( rgb[i], min, max );
amplify = 255.0/(max-min);
for(i=0; i<(width*height*3); i++)
{
int val = amplify * (rgb[i] - min);
if(val < brightness_adjust)
rgb[i] = val * 2;
else if (val > (255 - brightness_adjust))
rgb[i] = 255;
else
rgb[i] = val + brightness_adjust;
}
return GP_OK;
}
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