1 June 1990 Hybrid LZW compression
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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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
H. Garton Lewis, William B. Forsyth, "Hybrid LZW compression", Proc. SPIE 1244, Image Processing Algorithms and Techniques, (1 June 1990); doi: 10.1117/12.19509; https://doi.org/10.1117/12.19509

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