3D difference of offset Gaussian (DooG) filters. Creates a 3D derivative of Gaussian kernel. Use primarily for visualization purposes. For filtering better to use the indvidiual seperable kernels for efficiency purposes. INPUTS r - final mask will be NxNxN where N=2r+1 sigmas - sigmas for 3D Gaussian nderivs - order of derivative along each dimension show - [optional] whether or not to visually display the kernel OUTPUTS dG - The derivative of Gaussian mask EXAMPLE dG = filter_DOOG_3D( 50, [4,4,10], [1,1,0], 1 ); DATESTAMP 29-Sep-2005 2:00pm See also FILTER_DOOG_1D, FILTER_DOOG_2D