| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To highly efficiently process binary encoding and multi-level encoding in one encoder and to avoid a trouble of a JPEG (joint photographic experts group) 2000 algorithm by utilizing an image compression encoding technology based on the JPEG2000 algorithm. <P>SOLUTION: One of features of compression encoding based on the JPEG2000 algorithm is bit plane encoding and even in a character region=binary encoding region that can be originally represented with one-bit information as an image, it is necessary to encode a plurality of bit planes and useless encoding is performed as a result, so that encoding efficiency is low and a processing speed is also decelerated but an image region is judged by an image region separating means 121. On the basis of the result, processing contents are switched by a processing content switching means 122 and for a character region for binary encoding, two-dimensional wavelet transform processing or quantizing processing is not performed but it is started from following entropy encoding processing. Thus, useless processing can be omitted, processing can be accelerated and encoding efficiency is improved. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
