Simple and computationally efficient design of two-dimensional circularly symmetric IIR digital filters
C.L. Chan, Hon Keung Kwan · International Journal of Electronics · 1988
A simple and computationally efficient method for the design of a two-dimensional circularly symmetric IIR digital filters is introduced. This method has several advantages. Firstly, the digital filter format is a cascade of first- and second-order filter modules and is suitable for the VLSI modular implementation. Secondly, most of the coefficients can be determined directly from an one-dimensional analogue filter table and the stability of the filter is preserved. Finally, the unknown coefficients are very few in number and can be obtained by an unconstrained optimization method. Three examples are shown to illustrate the design method.