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    function im_eq=equ(im)

%im:input image with uint8 class
%im_eq: output equalized image with uint8 class

img=hist(im(:),0:255);

imTran=cumsum(img);
imTran=imTran*255/max(imTran);
im_eq=imTran(im(:,:)+1);
im_eq=uint8(im_eq);