Design of High Accuracy Truncated Multiplexer for DCT Applications
Abstract
Discrete cosine transform (DCT) is a widely used tool in image and video compression applications. Adders and multipliers are the main components in the DCT implementation. Recently, the high-throughput DCT designs have been adopted to fit the requirements of real-time applications. This paper proposes a pseudo carry compensation truncation (PCT) scheme for errorcompensation using multiplexer which deal with the truncation errors and to achieve low-error and highthroughput discrete cosine transform (DCT) design. Instead of
the 12 bits used in previous works, 9-bit distributed arithmetic-precision is chosen for this work so as to meet peak-signal-to-noise-ratio (PSNR) requirements. The design is implemented using VHDL on 0.18μm technology and proposed truncation scheme is applied to an image compression algorithm.
Keywords Discrete Cosine Transform(DCT), Distributed Arithmetic(DA) ,Truncation Scheme