1,721,020 research outputs found
Overlap and channel errors in Adaptive Vector Quantization for image coding
No full textAdaptive vector quantization (AVQ) is a flexible adaptive single pass image compression method, with fast decompression time, for which practical compression achieved compares favorably with existing methods such as the JPEG standard and traditional trained VQ. In this paper we analyze its asymptotic performance for the lossless case and present variations to limit the effect of transmission errors on the decoding image
High Performance Compression of Hyperspectral Imagery with Reduced Search Complexity in the Compressed Domain
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A Compact Index for Order-Preserving Pattern Matching
No full textOrder-preserving pattern matching was first studied surprisingly recently but has already attracted much attention. For this problem we propose a space-efficient index that works well in practice despite its lack of good worst-case time bounds. Our solution is based on the new approach of decomposing the indexed sequence into an em order component, containing ordering information, and a δ component, containing information on the absolute values. Experiments show that this approach is viable and it is the first one offering simultaneously small space usage and fast retrieval
Low Complexity Lossless Compression of Hyperspectral Imagery via Linear Prediction
No full textWe present a new low-complexity algorithm for hyperspectral image compression that uses linear prediction in the spectral domain. We introduce a simple heuristic to estimate the performance of the linear predictor from a pixel spatial context and a context modeling mechanism with one-band look-ahead capability, which improves the overall compression with marginal usage of additional memory. The proposed method is suitable to spacecraft on-board implementation, where limited hardware and low power consumption are key requirements. Finally, we present a least-squares optimized linear prediction technique that achieves better compression on data cubes acquired by the NASA JPL Airborne Visible/Infrared Imaging Spectrometer (AVIRIS)
Improving the performance of Adaptive Linear Prediction Coding (ALPC) via LeastSquare Minimization
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