IMAGE ENCODING METHOD, IMAGE DECODING METHOD, IMAGE ENCODING APPARATUS, IMAGE DECODING APPARATUS, IMAGE PROCESSING SYSTEM, IMAGE ENCODING PROGRAM, AND IMAGE DECODING PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an image encoding apparatus capable of efficient entropy encoding in orthogonal conversion of variable size.

SOLUTION: This image encoding apparatus 10 is provided with a block selecting means 14 for dividing an image signal into blocks to perform orthogonal conversion, reading an obtained orthogonal conversion coefficient to form it into a coefficient series and performing entropy encoding for the coefficient series, and selecting the size of a block to be subjected to orthogonal conversion from among a plurality of blocks having different sizes; a coefficient series dividing means 12 for dividing a coefficient series in a block having a size lager than the minimum size into a plurality of coefficient series having the same size as that of a coefficient series in a block of the minimum size when the coefficient series having a size larger than the minimum size is selected in the means 14; and an encoding means 13 for performing entropy encoding adapted to the coefficient series in the block of the minimum size.

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