Image analysis – Image compression or coding – Lossless compression
Reexamination Certificate
2006-05-23
2006-05-23
Johns, Andrew W. (Department: 2621)
Image analysis
Image compression or coding
Lossless compression
C382S173000
Reexamination Certificate
active
07050644
ABSTRACT:
The present invention includes methods and apparatus for attaining high speed coding and decoding. A first method decreases the number of memory access times by performing signal format conversion, orthogonal transform and continuous variable-length coding with predetermined small areas in a frame used as units. A second method omits orthogonal transform computation by using orthogonal transform coefficients to shorten the processing time. A third method uses additions and subtractions for orthogonal transform thereby decreasing the number of registers used and reducing the number of memory access times. The present invention further includes a decoding method for variable-length decoding wherein table size is not made larger because the number of table access times per code word is set to a maximum of 2, and plural code words are decoded by one table access operation to attain high-speed decoding.
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Japanese Patent Office Action dispatched Mar. 8, 2005 in connection with priority application JP 10-539428.
Juri Tatsuro
Ono Tadashi
Alavi Amir
Johns Andrew W.
Matsushita Electric - Industrial Co., Ltd.
Smith , Gambrell & Russell, LLP
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