Method and apparatus for lossless encoding and decoding
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United States of America Patent
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Issued Date -
Dec 8, 2005
app pub date -
Jun 7, 2005
filing date -
Jun 7, 2004
priority date (Note) -
Abandoned
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Abstract
A lossless moving picture encoding and decoding method and apparatus are provided by which when intra prediction of a block with a predetermined size is performed, the compression ratio is increased by using a pixel in a block to be predicted. The lossless moving picture encoding method includes: predicting each of pixel values in an M.times.N block to be predicted by using a pixel in the M.times.N block closest to the object pixel value in a prediction direction determined by an encoding mode; and entropy coding a difference between the predicted pixel value and the pixel value to be predicted. According to this method, the compression ratio becomes much higher than that of a conventional lossless encoding method.
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