Moving image coding apparatus, moving image decoding apparatus, and methods therefor

摘要

There are provided a moving image coding apparatus and moving image decoding apparatus which allow efficient decoding of an interlaced image from the coded data of a progressive image, and methods for the apparatuses. Noninterlaced moving image data is input from a moving image data input unit ( 101 ). Two consecutive frames are discriminated by a switch ( 102 ). A line interleaving unit ( 103 ) then generates new image data by alternately arranging the line data of the respective frames upon changing the order. A discrete wavelet transform unit ( 104 ) performs two-dimensional discrete wavelet transform for this image data to decompose it into seven subbands. Each subband is then coded.