⽤Matlab绘彩⾊图像的直⽅图直⽅图是常⽤的图表，⽤MATLAB实现如下：
Img=imread('football.jpg');
BW = Img;
R=BW(:,:,1);
[REDcounts,x] = imhist(R);
G=BW(:,:,2);
[Greencounts,y] = imhist(R);
B=BW(:,:,3);
[Bluecounts,z] = imhist(R);
figure;
subplot(131);imhist(R);title('histogram of Red');
subplot(132);imhist(G);title('histogram of Green');
subplot(133);imhist(B);title('histogram of Blue');
matlab直方图figure;
Histcounts=REDcounts+Greencounts+Bluecounts;
Histogramdata=Histcounts';
plot(Histogramdata);

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