[code]自动白平衡white blance

//2013.10.24
//eageldiao
//自动白平衡

CvScalar rgb;
rgb=cvAvg(src);

#ifdef COLOR_GW       //灰度世界假设（R，= R*K/Ravg ,其中，K=128 or （Ravg+Gavg+Bavg）/3 ）
int KK,gw_k;
//KK=rgb.val[0];
//if (rgb.val[1]>KK)KK=rgb.val[1];
//if (rgb.val[2]>KK)KK=rgb.val[2];
//gw_k=KK;                          //K=max(Ravg+Gavg+Bavg)
//gw_k=(rgb.val[0]+rgb.val[1]+rgb.val[2])/3;//K=mean(Ravg+Gavg+Bavg)
gw_k=;                       //K=128;
printf( "K=%d;BGR(%f,%f,%f)\n",gw_k,rgb.val[],rgb.val[],rgb.val[]);      //显示RGB三通道的均值。

#endif

#ifdef COLOR_REMAIN
float gw_k, rgbavg, KK;
//rgbavg=(rgb.val[0]+rgb.val[1]+rgb.val[2])/3;
//KK=rgb.val[0]/rgbavg;
//if(rgb.val[1]/rgbavg>KK)KK=rgb.val[1]/rgbavg;
//if(rgb.val[2]/rgbavg>KK)KK=rgb.val[2]/rgbavg;
//gw_k=KK;
gw_k=1.3;
printf( "K=%f(%f,%f,%f)\n",gw_k,rgb.val[],rgb.val[],rgb.val[]);      //显示RGB三通道的均值。

#endif

for(y=;y<height;y++)
{
unsigned char *srcrow= (unsignedchar*)(src->imageData+y*src->widthStep);
for (x=;x<width;x++)
{
#ifdef COLOR_GW                            //使用一般的灰度世界的方法
srcrow[*x]=srcrow[*x]*gw_k/rgb.val[]> ? :srcrow[*x]*gw_k/rgb.val[];
srcrow[*x+]=srcrow[*x+]*gw_k/rgb.val[]> ?: srcrow[*x+]*gw_k/rgb.val[];
srcrow[*x+]=srcrow[*x+]*gw_k/rgb.val[]> ?: srcrow[*x+]*gw_k/rgb.val[];
#endif

#ifdef COLOR_REMAIN                         //使用颜色保持的增强方法，R'/R=G'/G=B'/B=gw_k;
srcrow[*x]=srcrow[*x]*gw_k> ?: srcrow[*x]*gw_k;
srcrow[*x+]=srcrow[*x+]*gw_k> ?: srcrow[*x+]*gw_k;
srcrow[*x+]=srcrow[*x+]*gw_k> ?: srcrow[*x+]*gw_k;
#endif
}
}