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Applying Laplacian of Gaussian

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I applied LoG on image F(x,y). The output image G(x,y) contains the edges of F(x,y). When I subtract G(x,y) from F(x,y), it looks like the edges are slightly displaced than F(x,y) and the subtracted image holds noise. I also apply a number of iterations, for example, Iteration 1. input F(x,y)--> apply Log--> output G1(x,y) Iteration 2. input G1(x,y)--> apply Log--> output G2(x,y) In G2(x,y), all the edges are double lined. That means they are displaced than the original image. How can I fix this displacement?

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