Design of 2D IIR filters with canonical signed-digit coefficients using genetic algorithm

In this paper, genetic algorithm is used to design 2D octagonal symmetric IIR filters. The transfer function has nonseparable numerator and separable denominator polynomials in z/sub 1/ and z/sub 2/, and the designed filters have canonical signed-digit (CSD) coefficients. A new CSD number restoration technique is presented to ensure that the algorithm generates CSD coefficients with the pre-specified wordlength and maximum number of nonzero digits.