Stability Test for Two-Dimensional Recursive Filters

Abstract

For deciding the stability of a two-dimensional filter, it is of interest to determine whether or not a prescribed polynomial in the variables Z1 and z2 is nonzero in the region |Z1| < 1 ∩ |z2| < 1. A new procedure for testing for this property is given, which does not involve the use of bilinear tranformations. Key parts of the test involve the construction of a Schur-Cohn matrix and the checking for positivity on the unit circle of a set of self-inversive polynomials. Show more