The design of low-complexity in linear-phase FIR filter banks using powers-of-two coefficients with an application to subband image coding

摘要

An optimization technique is presented for the design of multiplierless two-channel linear-phase finite-duration impulse-response (FIR) filter banks. It is shown to yield filter banks with good filtering performance and nearly perfect signal reconstruction. The design employs filters whose coefficients are represented by a canonic signed-digit (CSD) code. When applied to subband image coding this technique provides an easy way to design low-complexity analysis/synthesis filter banks for high-performance codecs. Examples concerning filter design and the application of such filters to subband image coding are given.