On 2-variable reactance functions for 2-dimensional recursive filter design
Amar M. Ali, Anthony George Constantinides · Electronics Letters · 1978
The use of 2-variable reactance functions for designing stable 2-dimensional recursive filters is critically examined. The investigation shows that although the stability of the resulting filters is ensured, such functions do not preserve the amplitude characteristics of the 1-dimensional filter prototype over the 2-dimensional digital domain. A special choice of reactance functions that yields best design results is discussed.