I give you code generate edge detection an image processing using Laplacian of Gaussian algorithm which based on kernel matrix. it is not used matlab toolbox but handmade. so feel free to use it.

EDGE DETECTION USING LAPLACIAN OF GAUSSIAN\1derivation.jpg
..........................................\2deriv.jpg
..........................................\2derivation.jpg
..........................................\deteksilangsungLOG.jpg
..........................................\deteksilangsungzero.jpg
..........................................\deteksiLOG.jpg
..........................................\deteksimatlab.jpg
..........................................\EDGE DETECTION USING LAPLACIAN OF GAUSSIAN.docx
..........................................\EDGE DETECTION USING LAPLACIAN OF GAUSSIAN.pdf
..........................................\edge.jpg
..........................................\image2.jpg
..........................................\logzerro2D.m
..........................................\matlabtool.m
..........................................\original.jpg
..........................................\profile.jpg
..........................................\sample.png
..........................................\sample2.png
..........................................\SOURCES\3DHMM-Edge.pdf
..........................................\.......\A176_skonishi_IVC2003.pdf
..........................................\.......\AfED.doc
..........................................\.......\GetTRDoc.pdf
..........................................\.......\jc_all.pdf
..........................................\.......\kazanov_VIIP_2003.pdf
..........................................\Zero_Crossing.m
..........................................\~$GE DETECTION USING LAPLACIAN OF GAUSSIAN.docx
..........................................\~WRL3088.tmp
..........................................\SOURCES
EDGE DETECTION USING LAPLACIAN OF GAUSSIAN

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