淡江大學機構典藏:Item 987654321/62274
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    题名: Further GPU acceleration of predictive partitioned vector quantization for ultraspectral sounder data compression
    作者: Wei, Shih-chieh;Huang, Bormin
    贡献者: 淡江大學資訊管理學系
    关键词: Data compression;Graphics processing units;Quantization
    日期: 2011-11
    上传时间: 2011-10-18 13:06:59 (UTC+8)
    出版者: Society of Photo-Optical Instrumentation Engineers (SPIE)
    摘要: For the ultraspectral sounder data which features thousands of channels at each observation location, lossless compression is desirable to save storage space and transmission time without losing precision in retrieval of geophysical parameters. Predictive partitioned vector quantization (PPVQ) has been proven to be an effective lossless compression scheme for ultraspectral sounder data. It consists of linear prediction, bit-depth partitioning, vector quantization, and entropy coding. In our previous work, the two most time consuming stages of linear prediction and vector quantization were identified for GPU implementation. For GIFTS data, using a spectral division strategy for sharing the compression workload among four GPUs, a speedup of ~42x was achieved. To further enhance the speedup, this work will explore a spatial division strategy for sharing workload in processing the six parts of a GIFTS datacube. As result, the total processing time of a GIFTS datacube on four GPUs can be less than 13 seconds which is equivalent to a speedup of ~72x. The use of multiple GPUs for PPVQ compression is thus promising as a low-cost and effective compression solution for ultraspectral sounder data for rebroadcast use. © (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
    關聯: Proc. SPIE 8157, Satellite Data Compression, Communications, and Processing VII, 815704
    DOI: 10.1117/12.894390
    10.1117/12.894390
    显示于类别:[資訊管理學系暨研究所] 會議論文

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