Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2007-05-08
2007-05-08
An, Shawn S. (Department: 2621)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S240200, C375S240250, C375S240240, C375S240230, C375S240260, C382S250000, C382S233000, C382S248000, C382S235000, C382S246000, C348S206000
Reexamination Certificate
active
10293330
ABSTRACT:
An optimal scanning method for coding/decoding an image signal is provided. In a method of coding an image signal through a discrete cosine transform, at least one is selected among a plurality of reference blocks. A scanning order in which to scan blocks to be coded of the reference blocks is generated and the blocks to be coded are scanned in the order of the generated scanning order. The at least one selected reference block is temporally or spatially adjacent to the block to be coded. When the blocks to be coded are scanned, probabilities that non-zero coefficients occur are obtained from the at least one selected reference block, and the scanning order is determined in descending order starting from the highest probability. Here, the scanning order is generated to be a zigzag scanning order if the probabilities are identical. The optimal scanning method increases signal compression efficiency.
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Notice to Submit Response, by the Korean Patent Office on Apr. 26, 2004, Application No. 10-2002-0000709.
Choi Jong-se
Lee Shi-hwa
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