I = imread('E:zx.jpg');
I2=imcrop(I,[80,60,100,50]);
I3=imcrop(I,[200,260,350,300]);
c = normxcorr2(I2(:,:,1),I3(:,:,1));
figure, surf(c), shading flat
K=rgb2gray(I);
s=size(K);
x=250*ones(s(1),s(2));
x1=uint8(x);
D=imsubtract(x1,K);
figure,imshow(K);
figure,imshow(D);
能不能把每一句的意思说下啊