VARIABLE LENGTH ENCODING APPARATUS AND VARIABLE LENGTH DECODING APPARATUS

摘要

PROBLEM TO BE SOLVED: To reduce computational complexity required to select an optimum variable length encoding table.

SOLUTION: An apparatus for variable length encoding of each small region of an image includes: a calculation section for calculating difference values between pixel values and predicted pixel values of pixels included in the small region; an acquisition section for acquiring as a predetermined difference value a difference value whose absolute value is a predetermined value from the difference values calculated by the calculation section; a selection section for selecting one from a plurality of variable length encoding tables in accordance with the predetermined difference value acquired by the acquisition section; and a variable length encoding section for performing variable length encoding on the difference values calculated by the calculation section with the use of the variable length encoding table selected by the selection section.

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