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IBM Journal of Research and Development  
Volume 32, Number 6, Page 753 (1988)
Q-Coder
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Software implementations of the Q-Coder

by J. L. Mitchell, W. B. Pennebaker
The Q-Coder is an important new development in arithmetic coding. It combines a simple but efficient arithmetic approximation for the multiply operation, a new formalism which yields optimally efficient hardware and software implementations, and a new technique for estimating symbol probabilities which matches the performance of any method known. This paper describes implementations of the Q-Coder following both the hardware and software paths. Detailed flowcharts are given.
Related Subjects: Coding theory; Coding, arithmetic; Image processing