APPARATUS AND METHOD FOR ENCODING AND DECODING USING ALTERNATIVE CONVERTER ACCODING TO THE CORRELATION OF RESIDUAL SIGNAL
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United States of America Patent
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Issued Date -
Sep 24, 2009
app pub date -
Apr 13, 2007
filing date -
Sep 20, 2006
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Abandoned
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Abstract
Provided is an apparatus and method for encoding and decoding using alternative transform units according to the correlation of residual signals. The video encoding apparatus includes a first transforming unit for performing discrete cosine transform (DCT), first quantization, first inverse quantization, and inverse DCT on a block basis onto residual coefficients generated after intra frame prediction or inter frame prediction; a second transforming unit for performing discrete sine transform (DST), second quantization, second inverse quantization, and inverse DST on a block basis onto the residual coefficients; a selecting unit for selecting one having a high compression rate between the first and second transforming units for each block through performing rate-distortion optimization; and a flag marking unit for recording information about the selected transforming unit at a flag bit provided on a macroblock basis.
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