A Survey on VLSI Architectures of Lifting- Based 2D Discrete Wavelet Transform

The aim of this paper is to review emerging trends in efficient implementations of VLSI architecture of lifting based two-dimensional discrete wavelet transform (2D-DWT).The basic principle of lifting scheme is decomposing finite impulse response (FIR) filter into finite sequence of filtering steps. The inherent in place computation of lifting scheme has many advantages, and has been adapted in the JPEG 2000 standard for image compression. In this paper, we provide survey of various architectures and memory scan techniques of 2D-DWT and have been compared in terms of hardware and timing complexity. This comparative study is very much essential to design a new hardware implementation of lifting scheme based 2D-DWT architecture for image compression. Keyword: Discrete Wavelet Transform, lifting-based VLSI architecture, Image compression