2D Gabor filters. Creates a pair of Gabor filters (one odd one even) at the specified orientation. For Thomas' ECCV98 filters, use sig=sqrt(2), lam=4. INPUTS r - final mask will be 2r+1 x 2r+1 sig - standard deviation lam - elongation theta - orientation show - [optional] figure to use for display (no display if == 0) OUTPUTS Feven - even symmetric filter (-cosine masked with Gaussian) Fodd - even symmetric filter (-sine masked with Gaussian) EXAMPLE [Feven,Fodd]=filter_gabor_2D(15,sqrt(2),4,45,1); DATESTAMP 29-Sep-2005 2:00pm See also FILTER_GABOR_1D, FILTER_GAUSS_ND