Abstract
The compression of three-dimensional ultraspectral sounder data is a challenging task given its unprecedented size. We develop a fast precomputed vector quantization (FPVQ) scheme with optimal bit allocation for lossless compression of ultraspectral sounder data. The scheme comprises of linear prediction, bit-depth partitioning, vector quantization, and optimal bit allocation. Linear prediction approach a Gaussian Distribution serves as a whitening tool to make the prediction residuals of each channel close to a Gaussian distribution. Then these residuals are partitioned based on bit depths. Each partition is further divided into several sub-partitions with various 2k channels for vector quantization. Only the codebooks with 2m codewords for 2k-dimensional normalized Gaussian distributions are precomputed. A new algorithm is developed for optimal bit allocation among sub-partitions. Unlike previous algorithms [19, 20] that may yield a sub-optimal solution, the proposed algorithm guarantees to find the minimum of the cost function under the constraint of a given total bit rate. Numerical experiments performed on the NASA AIRS data show that the FPVQ scheme gives high compression ratios for lossless compression of ultraspectral sounder data.
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Acknowledgement
This research was supported by National Oceanic and Atmospheric Administration’s National Environmental Satellite, Data, and Information Service under grant NA07EC0676. The views, opinions, and findings contained in this report are those of the author(s) and should not be construed as an official National Oceanic and Atmospheric Administration or U.S. Government position, policy, or decision.
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Huang, B. (2012). Fast Precomputed Vector Quantization with Optimal Bit Allocation for Lossless Compression of Ultraspectral Sounder Data. In: Huang, B. (eds) Satellite Data Compression. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-1183-3_12
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DOI: https://doi.org/10.1007/978-1-4614-1183-3_12
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