| 摘要 |
A decoding unit ( 12 ) decodes an image according to JPEG 2000. A simplifying unit ( 30 ) comprises an automatic transformer ( 32 ) which compares an elapsed time to a time limit at each stage of decoding the image and switches the decoding process to a simplified process if necessary. For instance, if the playback of a motion picture takes over 1/30 second, the simplified process, in which only low frequency components are decoded, is conducted by the automatic transformer ( 32 ).
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