Optimized lossless data compression methods
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United States of America Patent
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Aug 12, 2008
Grant Date -
Mar 8, 2007
app pub date -
Jan 30, 2006
filing date -
Jan 31, 2005
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Abstract
A method for losslessly encoding and compressing and decoding original, raw, raster data, and other files by optimizing the results of preprocessing and transformation techniques. Four stages are involved: pre-processing during which the data is replaced by predictive values and the deviations from the predictive value; mapping each block through a transform sequence using a lossy reversible mapping; minimizing the joint entropy of the transformed data and deviation data by varying parameters for the predictive and transform step; and encoding the transformed sequence. At each stage of the compression of the data, different techniques are tried and compared and an optimal technique used to carry out that state.
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