Picture encoding and/or decoding method and apparatus
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United States of America Patent
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Dec 12, 1995
Grant Date -
N/A
app pub date -
Sep 25, 1992
filing date -
Sep 30, 1991
priority date (Note) -
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Abstract
A picture encoding and/or decoding system adaptively changes encoding manner in discrete cosine transformation or predictive coding for improving a picture quality of transmission picture. A variable length coding method is changed in accordance with the change between the discrete cosine transformation and predictive coding. When discrete cosine transforming, a combination of a zero run length and a pixel value is effected two dimensional variable length coding. When predictive coding, a combination of a zero run length and a difference value between pixel values is effected two dimensional variable length coding. When predictive coding, a predictive value of a block and a quantization width are transmitted.
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