Design of two-dimensional circularly symmetric low-pass IIR filters using transformation
Manideep Raya V S R S Reddy, S.N. Hazra · IEEE Transactions on Circuits and Systems · 1988
A technique for designing two-dimensional IIR (infinite-impulse response) filters using a separable transformation function has been reported recently. A modification of this technique is proposed for circularly symmetric filters which gives better results.>