A Multirate Filter Bank Perspective of Retinal Processing

Abstract

A multirate filter bank (MRB) consists of a set of filters that produce several reduced sampling-rate versions of the same input signal (fig. 1). They have been found useful for subband coding [1, 2], image compression [3] and other areas [3, 4]. The possible implementations for MRBs tradeoff computational with connectional complexities and handle processor noise differently. We explore the consequences of the various MRB implementations for retinal processing and show that fully parallel processing or hybrid parallel/hierarchic processing are candidates for the retina.