JPEG 2000算法嵌入式块编码的DSP高效实现策略  

Strategy for High Efficient DSP Implementation of Embedded Block Coding in JPEG2000

作　　者：鲁琴[1] 杜列波[1] 罗武胜[1] 

机构地区：[1]国防科技大学机电工程与自动化学院,湖南长沙410073

出　　处：《测试技术学报》2009年第5期440-444,共5页Journal of Test and Measurement Technology

基　　金：国家高技术研究发展计划(2006AA701121);国家自然科学基金资助项目(60872151)

摘　　要：结合DSP软件流水的特点,提出了一种嵌入式编码DSP高效实现策略.对算法结构进行了优化,将符号编码和算术编码从位平面扫描循环中分离出来,然后将位平面扫描循环展开,使得算法DSP程序软件流水得以建立.通过EDM A与CPU并行工作,将算法DSP实现中的数据传输时间隐藏.此外,针对DSP的数据读写特点改进了小波系数的存储结构.通过C语言和线性汇编语言混合编程的方式对算法进行了实现.实验表明,优化后嵌入式编码的DSP实现速度提高到原来的10倍以上.Considering the characteristic of DSP software pipeline, a strategy for high efficient DSP implementation of Embedded Block Coding （EBC） is proposed. Firstly, the sign coding module and arithmetic coding module are separated from the original bit-plane coding cycle, and the multiple loops of the bit-plane scanning module are unwrapped with the context combining. Secondly, EDMA is used to transport data in parallel way with CPU. The time spending on data transport can be ignored. Thirdly, the storage structure of the wavelet coefficients is modified. Finally, the DSP implementation program is written by combining C language with assemble instructions. The test results show that the proposed optimization strategy makes the DSP implementation speed of EBC increase by more than 10 times.

关 键 词：嵌入式编码 JPEG2000 DSP 软件流水 

分 类 号：TN919.8[电子电信—通信与信息系统]