VARIABLE LENGTH ENCODING METHOD AND VARIABLE LENGTH DECODING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a variable length encoding method with which coding efficiency is improved when coding coefficients.

SOLUTION: The present invention is a variable length coding method 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 comprises: a coefficient value 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 value 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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