基于VLIW的汇编级FDCT和扫描量化优化算法  

An Assembly Optimization Algorithm of Scan Quantization and FDCT Based on VLIW

作　　者：刘广[1] 肖创柏[1] 欧阳万里[1] 苏开娜[1] 

机构地区：[1]北京工业大学计算机学院,北京100022

出　　处：《计算机工程与应用》2006年第3期59-62,共4页Computer Engineering and Applications

摘　　要：在视频处理领域以及M EPG2/4相关领域中FDCT以及扫描量化操作的执行效率已经成为大家共同关注的问题,算法优化日益成为热点。文章首先对两个经典的FD CT和扫描量化算法进行了分析,指出了算法的不足之处并给出了解决办法,以TM1300为例介绍了VLIW结构的特性,研究了基于D SP芯片的优化方法,并应用这些方法对M PEG4的FD CT、量化和扫描进行了汇编级的量化优化,最后利用仿真板提供的性能分析工具对汇编级优化的效果和C语言级优化的效果进行了比较,汇编级优化所需指令周期约为C语言级优化周期的60%。The efficiency of FDCT,scan and quantization has been a serious problem in video processing field,MPEG 2/4 and related fields.So the optimal algorithm becomes more and more heated.In this paper,we analyze two classic FDCT,scan and quantization algorithms first,at the same time we point out the limits of the algorithms and give the methods to solve the problems.Then we introduce the characters of VLIW and the general optimized methods based on TM1300,then we optimize the FDCT quantization and scan of MPEG 4 through assembly code.Finally we compare the effect of the function optimized by assembly code with the optimized one by C code.The totally cycles required for the assembly optimized algorithm is about 60% of the original optimized by C code.

关 键 词：汇编 超长指令字(VLIW) DCT 扫描 量化 视频压缩 

分 类 号：TN951.52[电子电信—信号与信息处理]