Laplacian of Gaussian kernel
k = klog(sigma) is a 2-dimensional Laplacian of Gaussian kernel of width (standard deviation) sigma and centred within the matrix k whose half-width is H=3xSIGMA, and W=2xH+1.
k = klog(sigma, H) as above but the half-width H is specified.
kgauss, kdog, kdgauss, iconv, zcross
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