%KLOG	Laplacian of Gaussian kernel%%	k = klog(w, sigma)%%	Return a Laplacian of Gaussian (LOG) kernel of width (2w+1) with%	the specified sigma.%% SEE ALSO:	zcross%%	Copyright (c) Peter Corke, 1999  Machine Vision Toolbox for Matlab% Peter Corke 1996% $Header: /home/autom/pic/cvsroot/image-toolbox/klog.m,v 1.1 2005/10/23 11:29:41 pic Exp $% $Log: klog.m,v $% Revision 1.1  2005/10/23 11:29:41  pic% Laplacian kernel.%% Revision 1.1.1.1  2002/05/26 10:50:22  pic% initial import%function il = klog(sigma, w)	if nargin == 1,		w = 2*sigma;	end	[x,y] = meshgrid(-w:w, -w:w);	il = -1/(2*pi*sigma^4) * (2 - (x.^2 + y.^2)/sigma^2) .*  ...		exp(-(x.^2+y.^2)/(2*sigma^2));