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RD-OPT: an efficient algorithm for optimizing DCT quantization tables

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2 Author(s)
Viresh Ratnakar ; Dept. of Comput. Sci., Wisconsin Univ., Madison, WI, USA ; Livny, M.

The Discrete Cosine Transform (DCT) is widely used in lossy image and video compression schemes such as JPEG and MPEG. In this paper we describe RD-OPT, an efficient algorithm for constructing DCT quantization tables with optimal rate-distortion tradeoffs for a given image. The algorithm uses DCT coefficient distribution statistics in a novel way and uses a dynamic programming strategy to produce optimal quantization tables over a wide range of rates and distortions. It can be used to compress images at any desired signal-to-noise ratio or compressed size

Published in:

Data Compression Conference, 1995. DCC '95. Proceedings

Date of Conference:

28-30 Mar 1995

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