dir
close all
vcapg;
aa=vcapg;
figure(1);subplot(2,2,1);image(aa)
subplot(2,2,2);imshow(diff(double(aa(:,:,1))),[]);
subplot(2,2,3);imshow(rgb2gray(aa),[]);
subplot(2,2,4);imshow(double(aa(:,:,1)<128),[]);
save matcap aa