OpenCV白平衡算法之灰度世界法（消除RGB受光照影响）
http://www.cnblogs.com/ggYYa/p/5707259.html//求各通道的平均值
25 imageBlueChannelAvg = mean(imageBlueChannel);
26 imageGreenChannelAvg = mean(imageGreenChannel);
27 imageRedChannelAvg = mean(imageRedChannel);
28
29 //求出个通道所占增益
30 double K = (imageRedChannelAvg+imageGreenChannelAvg+imageRedChannelAvg)/3;
31 double Kb = K/imageBlueChannelAvg;
32 double Kg = K/imageGreenChannelAvg;
33 double Kr = K/imageRedChannelAvg;
34
35 //更新白平衡后的各通道BGR值
36 addWeighted(imageBlueChannel,Kb,0,0,0,imageBlueChannel);
37 addWeighted(imageGreenChannel,Kg,0,0,0,imageGreenChannel);
38 addWeighted(imageRedChannel,Kr,0,0,0,imageRedChannel);
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