Synthesis of 2-D linear phase digital filters
Gaoquan Gu, Belle A. Shenoi, C. Zhang · IEEE Transactions on Circuits and Systems · 1990
The synthesis of two-dimensional (2-D) linear-phase digital filters is studied in terms of approximation of 2-D transfer functions. A convergence result is established for the approximation of nonrational 2-D transfer functions under a certain mild frequency domain condition. It is shown that the synthesis of 2-D linear-phase FIR (finite impulse response) digital filters can be transformed into an equivalent approximation for which the convergence condition is satisfied. A 2-D linear-phase IIR (infinite impulse response) digital filter is then synthesized based on an FIR model. Several examples are given to illustrate the synthesis technique.>