Method of further compressing JPEG image
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United States of America Patent
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Issued Date -
Jan 25, 2007
app pub date -
Jul 21, 2005
filing date -
Jul 21, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Recovered 8.times.8 DCT coefficient arrays of all block of a JPEG image is formed by reversely decompressing the JPEG image till the procedure of dequantization. A method of redundancy removal of inter-block same subband AC coefficient and intra-block adjacent subband DCT coefficients is applied by re-ordering the coefficients by magnitude of the neighboring subband or a weighted sum of those. The differential values of both inter-block and intra-block DCT coefficients are calculated and coded by an entropy coder to further reduce the data rate. A short code is assigned to represent the 'end of non-zero' of each re-ordered subband AC coefficients.
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