Image coding device and method thereof and image decoding device and method thereof

摘要

A predetermined area of input image data ( 100 ) is read and stored into a memory section ( 1 ). As soon as data is stored in the data read memory section ( 1 ), wavelet conversion filtering is performed on the image area, in the horizontal or vertical direction, by a wavelet conversion section ( 5 ). The wavelet conversion section ( 5 ) comprises a fixed-point type wavelet conversion section ( 3 ) and an integer type wavelet conversion section ( 4 ). Data from the data read memory section ( 1 ) is switched and controlled by a switching section ( 2 ), and supplied to either the fixed-point wavelet conversion section ( 3 ) or the integer type wavelet conversion section ( 4 ).