Variable length coding method and variable length decoding method
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United States of America Patent
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Apr 28, 2015
Grant Date -
Mar 13, 2008
app pub date -
Oct 17, 2007
filing date -
Apr 19, 2002
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Abstract
A variable length coding method is provided for coding coefficients in each block which are obtained by performing frequency transformation on picture data of a moving picture per block having a predetermined size, and includes: a coefficient scanning step of scanning the coefficients in the block in a predetermined order; and a coding step of coding the coefficients scanned in the coefficient scanning step into variable length codes in a predetermined order by switching a plurality of tables to be used for coding. Here, a direction of switching between the tables may be one-directional. Also, the coding may be non-arithmetic coding.
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