OpenCV白平衡算法之灰度世界法（消除RGB受光照影响）

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http://www.cnblogs.com/ggYYa/p/5707259.html

1. //求各通道的平均值
   
2. 25     imageBlueChannelAvg = mean(imageBlueChannel)[0];
   
3. 26     imageGreenChannelAvg = mean(imageGreenChannel)[0];
   
4. 27     imageRedChannelAvg = mean(imageRedChannel)[0];
   
5. 28
   
6. 29     //求出个通道所占增益
   
7. 30     double K = (imageRedChannelAvg+imageGreenChannelAvg+imageRedChannelAvg)/3;
   
8. 31     double Kb = K/imageBlueChannelAvg;
   
9. 32     double Kg = K/imageGreenChannelAvg;
   
10. 33     double Kr = K/imageRedChannelAvg;
    
11. 34
    
12. 35     //更新白平衡后的各通道BGR值
    
13. 36     addWeighted(imageBlueChannel,Kb,0,0,0,imageBlueChannel);
    
14. 37     addWeighted(imageGreenChannel,Kg,0,0,0,imageGreenChannel);
    
15. 38     addWeighted(imageRedChannel,Kr,0,0,0,imageRedChannel);

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