Apparatus and methods for re-compression having a monotonic relationship between extent of compression and quality of compressed image
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United States of America Patent
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Aug 12, 2014
Grant Date -
Mar 14, 2013
app pub date -
Apr 14, 2011
filing date -
Apr 29, 2010
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Abstract
A computerized method for independent disjoint block-level recompression of a first image generated by independent coding of disjoint blocks in a precursor image, the first image having at least one first quantization matrix associated therewith, the method comprising performing at least one independent disjoint block-level compression operation, using a processor on the first image, thereby to generate a re-compressed second image including generating a new quantization matrix and using the new quantization matrix for the independent disjoint block-level compression, including computing a rounding error created by the quantization process utilizing the new quantization matrix and, if needed, adjusting at least one value of the new quantization matrix to reduce a rounding error created by the quantization process utilizing the new quantization matrix.
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