摘要
在提升算法的基础上,设计了一种有效利用存储器资源的二维小波提升结构,此结构是根据奇数长度对称滤波器的特点简化得到的,使用它一次只需缓存六行数据就可以做完垂直提升生成一个垂直低通行和一个垂直高通行,再做水平方向的提升就生成了LL,HL,LH和HH四个子带行。这种结构可以大大减少存储器的消耗。另外本文又采用一种避免内存碎片产生的存储器申请算法,即先集中登记需要使用的内存总量,再统一分配一块连续地址的空间。
Based on the lifting scheme, an optimal 2 - D wavelet lift architecture is designed which can efficiently use the memories. The architecture is predigested from the feature of odd length symmetric filters. In this way vertical lifting to only six rows of data buffered can produce one vertical low pass row and one vertical high pass row. Then following horizontal lifting to them can again result in the final four low and high pass subband rows. This algorithm can decrease a lot of memory consumptions. In addition a memory apply strategy is designed to avoid the memory fragments. That is, first the needed memory number is enrolled and then a chunk of continuous address memories is allocated.
出处
《微计算机应用》
2007年第9期897-900,共4页
Microcomputer Applications
关键词
小波变换
二维提升结构
内存碎片
wavelet transform, 2 -D lift scheme architecture, memory fragments