基于多级查询表的JPEG2000位平面扫描优化方法

针对JPEG2000位平面编码的VLSI实现,提出一种基于多级查询表的扫描优化方法.该方法以树型查找表为基准,在有效性传播通道中提前记录编码必要性信息,实现了后续通道的启发式扫描.与K'Chen等人提出的GOCS方法比较,不仅消除了扫描中出现的冗余组,而且消除了冗余列,进一步提高了扫描速率.该方法的另一优点是可以完成通道扫描和状态变量的并行刷新,支持Y Hsia存储优化技术而不影响系统整体效率.实验结果表明,在VLSI设计中引入该方法,位平面编码的扫描时间可缩短25%,存储资源将节省8.72%.

A JPEG2000 Optimized Bit-Plane Scanning Method Based on Multilevel Query Table

Aiming at VLSI implementation of the bit-plane encoding in JPEG2000,a new structure,CBQT (Column-Based Query Table),and its corresponding scanning method,are presented.The main idea is to record the NBC(Need-Block-Coding) messages of pass 2 and 3 in advance by a certain polling tree,so heuristic search can be fufilled in the subsequent pass-scanning.Compared with K.Chen's GOCS scheme,this method achieved the single-column-skipping.Another advantage is that CBQT could manipulate pass-coding and state-updating simultaneously,so Y.Hsia's memory saving technique was imported without affecting system's coding efficiency.Experimental results show that whole time of bit-plane scanning is reduced by 25% of the original,and 8.72% required memory space is curtailed as well.