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Proceedings Paper

Hybrid LZW compression
Author(s): H. Garton Lewis Jr.; William B. Forsyth
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Paper Abstract

The microgravity experiments to be implemented on Space Station Freedom generate gigabytes of PCM data daily. The limited bandwidth of the NASA Tracking and Data Relay Satellite System (TDRSS) will require the images from these experiments to be compressed before they are transmitted to the ground control centers. The matrix of compression ratios required for these experiments suggest compression ratios of 2:1 for lossless coding and 2:1 to 6:1 for lossy predictive coding. Forthe Space Station program, it would be highly desirable to implement one baseline compression system which would meet both of these criteria. This paper presents a LZW (Lempel-Ziv-Welch) hybrid coding system which is adaptable to either mode of operation. The system has been designed to provide the scientist with control over the data-quality versus data-volume trade-off. This control may be made through the command and control system while an experiment is under way. This system also has the ability to compress interleaved telemtered data while operating in the lossless mode.

Paper Details

Date Published: 1 June 1990
PDF: 8 pages
Proc. SPIE 1244, Image Processing Algorithms and Techniques, (1 June 1990); doi: 10.1117/12.19509
Show Author Affiliations
H. Garton Lewis Jr., Loral Fairchild Systems Inc. (United States)
William B. Forsyth, Loral Fairchild Systems Inc. (United States)

Published in SPIE Proceedings Vol. 1244:
Image Processing Algorithms and Techniques
Robert J. Moorhead II; Keith S. Pennington, Editor(s)

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