图像处理——白平衡（灰度世界方法）

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使用相机等采集图像的过程中，往往由于成像过程中的感光元件或者镜头会对原始色彩造成影响，为了校正这种光线和镜头对颜色影响，都会加入白平衡来对成像结果进行调整，那么今天就介绍一个最简单的白平衡处理方法：灰色世界方法

话不多说了，有不懂原理的可以留言，直接上测试通过的代码：

im = imread('1.jpg','jpg');
im = double(im)./256;
r = im(:,:,1);
g = im(:,:,2);
b = im(:,:,3);
avgR = mean(mean(r));
avgG = mean(mean(g));
avgB = mean(mean(b));
avgGray = (avgR + avgG + avgB)/3;
if avgR == 0
outR = r;
else
outR = (avgGray/avgR).*r;
end

if avgG == 0
outG = g;
else
outG = (avgGray/avgG).*g;
end

if avgB == 0
outB = b;
else
outB = (avgGray/avgB).*b;
end

maxRGB = [max(max(outR)) max(max(outG)) max(max(outG))];

factor = max(maxRGB);
if  factor > 1
outR = outR./factor;
outG = outG./factor;
outB = outB./factor;
end

GWoutIm(:,:,1) = outR;
GWoutIm(:,:,2) = outG;
GWoutIm(:,:,3) = outB;

imshow(GWoutIm);

imwrite(GWoutIm, 'testout.jpg', 'jpg');

avgIn1RGB = [mean(mean(r)) mean(mean(g)) mean(mean(b))];
avgGW1RGB = [mean(mean(outR)) mean(mean(outG)) mean(mean(outB))];
avgIn1 = mean([mean(mean(r)) mean(mean(g)) mean(mean(b))]);
avgGW1 = mean([mean(mean(outR)) mean(mean(outG)) mean(mean(outB))]);

一下是测试图像（来源自网络）：

原始图像（色调偏冷）



处理以后的图像（色调转暖）：



谢谢您的支持，有任何的问题欢迎留言