VIII. Conclusions
The foregoing discussion describes in details an extension of the LBG algorithm to the locally optimal design of a partitioned vector quantizer for the encoding of source vectors drawn from a high dimensional source on ℜd. LPVQ breaks down the input space into subspaces and, for each subspace, designs a minimal-distortion vector quantizer. The partition is adaptively determined while building the quantizers in order to minimize the total distortion. Experiments on lossless and near-lossless compression of publicly available AVIRIS images show the effectiveness of the proposed method. The peculiar statistics of this class of data requires a suitable entropy coder for both quantization indices and residuals. Off-the-shelf lossless image compressors perform reasonably well on quantization indices, but it is shown how careful conditioning allows for faster and more efficient compression of the quantization indices. Applications of LPVQ to real-time compression and broadcasting, fast browsing pure-pixel classification, and real-time compression on general-purpose hardware are described in detail.
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Motta, G., Rizzo, F., Storer, J.A. (2006). Locally Optimal Partitioned Vector Quantization of Hyperspectral Data. In: Motta, G., Rizzo, F., Storer, J.A. (eds) Hyperspectral Data Compression. Springer, Boston, MA. https://doi.org/10.1007/0-387-28600-4_5
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