Method and apparatus for coding and decoding image data

摘要

In an image coding apparatus (10), after generating a correspondence information file between key frames by a matching processor (16), resolution of specified key frames is reduced by a resolution converter (18). A data stream which includes data of key frames with different resolution levels and a correspondence information file are generated by a stream generator (20). In an image decoding apparatus, an intermediate image generator generates an intermediate frame by interpolation, based on correspondence information file and key frame data of which pixel number is previously made uniform by a pixel number converter.