Non-Expansive Implementation of Discrete Wavelet Transform for Real Time Image Coding System

The filter bank implementation of standard Discrete Wavelet Transform (DWT) suffers from coefficient expansion problem. In this paper a methodology is proposed to address the coefficient expansion problem of standard DWT. With this methodology a non –expansive implementation is carried out without increasing computation load and memory requirements. However, this non-expansive filter bank realization of discrete wavelet transform suffers from boundary artifacts, but it is restricted to a fewer coefficients only at the boundaries. An optimal filter is required to reduce this boundary artifacts problem. The proposed non-expansive DWT is highly suited for real time wavelet based image coding system.