The laplacian-of-gaussian kernel: A formal analysis and design procedure for fast, accurate convolution and full-frame output

An LoG of space constant σ can be decomposed into the product of a Gaussian and an LoG mask (Chen, Huertas, and Medioni, IEEE Trans. Pattern Anal. Mach. Intell. PAMI-9, 1987, 584–590). The resulting LoG has space constant σ1

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