Method and apparatus for encoding orthogonal transform coefficients

摘要

Method and apparatus for performing data conversion between first-format encoded data in which orthogonal transform coefficients are arranged in an order of DC components and AC components from a low spatial frequency order to a high spatial frequency order in each orthogonal transform block when compression encoding which includes orthogonal transform is applied to video data and second-format encoded data in which orthogonal transform coefficients are arranged in an order of DC components and AC components from a low spatial frequency order to a high spatial frequency order in each block assembly member formed of a plurality of orthogonal transform blocks when compression encoding which includes orthogonal transform is applied to video data. The second-format encoded data may be decoded to obtain orthogonal transform coefficients which may be re-arranged from a low spatial frequency order to a high spatial frequency order in each orthogonal transform block of the first format. Such orthogonal transform coefficients may be encoded to form encoded data having the first format.