Two-dimensional filter design based on frequency mapping of analog prototype filters
Radu P. Matei, Liviu Goraş · 2011
In this work an analytical design method for two types of 2D recursive filters is proposed. The design starts from a given analog prototype filter with specified parameters and a transfer function which is factorized into elementary (biquad) functions. Applying adequate frequency transformations to these functions, the desired 2D filters are directly obtained in a factorized form, preserving the selectivity properties of their 1D counterparts. The types of 2D filters approached here are narrow orientation-selective filters with a specified orientation and maximally-flat low-pass filters with circular symmetry. Design examples starting from imposed specifications and simulation results are provided.