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[h,w]=size(I);
iter=1000;
for i=1:iter
I_x=(I([2:h h],-I([1 1:h-1],)/2;     Ëã·¨ÕâÒ»¾äÔõôȥÀí½â£¿
I_y=(I(:,[2:w w])-I(:,[1 1:w-1]))/2;
    I_det=sqrt(1+I_x*I_x+I_y*I_y);
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