| 摘要 |
<P>PROBLEM TO BE SOLVED: To enhance the compression ratio and the image quality, by enhancing the prediction accuracy of each stage. <P>SOLUTION: In the AC component prediction method of predicting the AC component for each block, from the DC component image data consisting of the DC component of each block obtained from image information consisting of a plurality of blocks, the processing of predicting the AC components V<SB POS="POST">L</SB>, V<SB POS="POST">R</SB>in the left and right directions of a target block on the basis of the DC components S of the target block and the DC components L, R of the left and right blocks thereof is repeated for all blocks. Subsequently, the processing of predicting the AC components V<SB POS="POST">UL</SB>, V<SB POS="POST">BL</SB>, V<SB POS="POST">UR</SB>, V<SB POS="POST">BR</SB>in the vertical direction of the target block on the basis of the AC components V<SB POS="POST">L</SB>, V<SB POS="POST">R</SB>of a predicted target block and the predicted AC components U<SB POS="POST">L</SB>, U<SB POS="POST">R</SB>, B<SB POS="POST">L</SB>, B<SB POS="POST">R</SB>of upper and lower blocks thereof is repeated for all blocks. <P>COPYRIGHT: (C)2013,JPO&INPIT |
