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Proceedings Paper

LNS for low-power MPEG decoding
Author(s): Mark G. Arnold
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Paper Abstract

Floating-point and fixed-point are expensive for portable multimedia devices. Low-cost Logarithmic Number System (LNS) arithmetic can reduce power consumption of MPEG decoding in exchange for barely perceptible video artifacts. Different number representations need different word sizes to produce the same quality image. LNS can produce good visual results using fewer bits than fixed point. Rounding to the nearest is often done with fixed point and floating point, but LNS allows a cheaper unrestricted-faithful-rounding mode that does not degrade the visual quality of MPEG outputs. This paper also describes how the Berkeley MPEG tools were modified to carry out these MPEG arithmetic experiments.

Paper Details

Date Published: 6 December 2002
PDF: 12 pages
Proc. SPIE 4791, Advanced Signal Processing Algorithms, Architectures, and Implementations XII, (6 December 2002); doi: 10.1117/12.452048
Show Author Affiliations
Mark G. Arnold, Univ. of Manchester Institute of Science and Technology (United Kingdom)

Published in SPIE Proceedings Vol. 4791:
Advanced Signal Processing Algorithms, Architectures, and Implementations XII
Franklin T. Luk, Editor(s)

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