1D difference of offset Gaussian (DooG) filters. Creates a 2D 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 have length 2r+1 sig - sigma for Gaussian deriv - order of derivative show - [optional] figure to use for display (no display if == 0) OUTPUTS dG - The derivative of Gaussian mask EXAMPLE dG = filter_DOOG_1D( 11, 2, 3, 1 ); DATESTAMP 29-Sep-2005 2:00pm See also FILTER_DOOG_2D, FILTER_DOOG_3D