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

Authors:
Viresh Ratnakar;M. Livny
Affiliations:
-;-
Venue:
DCC '95 Proceedings of the Conference on Data Compression
Year:
1995

Citing 3
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Abstract

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.