| 摘要 |
A SIGNAL HAVING BLOCKS OF VALUES IS CODED BY : PRODUCING RESPECTIVE BIT-STREAMS (DCT_1...DCT_N) FOR RESPECTIVE INDIVIDUAL BLOCKS , AND OBTAINING A SCALABLE BIT-STREAM BY CYCLICALLY ABS SEQUENTIALLY SCANNING SELECTED PARTS (P1,P2,...) OF THE RESPECTIVE BIT-STREAMS(DCT_1...DCT_N) OF THE RESPECTIVE INDIVIDUAL BLOCKS, @WHEREIN , IN GIVEN SCANNING CYCLE , THE RESPECTIVE BIT-STREAM (DCT_1...DCT_N) ARE SCANNED IN AN ORDER OF DECREASING SIGNIFICANCE. IN A FURTHER EMBODIMENT, THE BLOCKS REPRESENT A CODED IMAGE AND THE GIVEN SCANNING CYCLE STARTS AT A BLOCK APPROXIMATELY A CENTER OF THE CODED IMAGE . IN ANOTHER EMBODIMENT , THE BLOCK REPRESENT A CODED IMAGE AND THE GIVEN SCANNING CYCLE SCANS THE RESPECTIVE BIT-STREAMS IN AN IMAGE-ADAPTIVE ORDER BEING DETERMINED BY A PREDETERMINED CRITERION , SUCH AS A CONTRAST VALUE. FIGUR 1. |
