基于RISC-DSP微处理器的反离散余弦变换算法  

Optimized algorithm of inverseddiscrete cosine transform based on RISC-DSP microprocessor

作　　者：徐红阳[1] 刘鹏[1] 俞国军[1] 蔡卫光[1] 

机构地区：[1]浙江大学信息与电子工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2006年第3期454-458,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家"863"高技术研究发展计划专项经费资助项目(2002AA1Z1140);霍英东教育基金资助项目(94031)

摘　　要：为了提高视频图像处理速度与处理器资源的利用,提出了一种基于精简指令集计算机与数字信号处理器(RISC-DSP)联合架构微处理器的反离散余弦变换(IDCT)的优化算法.基于RISC-DSP核微处理器的指令集体系结构特点,研究分析了视频图像处理中8×8的IDCT算法,将其分解为两级矩阵乘法运算的结构,并利用RISC-DSP核微处理器的多媒体指令分两步实现.实验结果表明,在RISC-DSP核微处理器上,进行一次8×8的IDCT运算仅需执行530条指令,占用存储空间1 424字节.该优化算法实时性好,占用处理器资源少,具有较强的实用性.To improve video image processing speed and utilization of processor resource, an optimized algorithm of inversed discrete cosine transform （IDCT） based on microprocessor with unifying architecture of reduced instruction set computer and digital signal processor （RISC-DSP） was introduced. The 8 × 8 IDCT algorithm in video image processing was analyzed based on the character of the instruction set architecture and then divided into two stages of matrix multiplication. The multimedia extended instructions of the RISC-DSP processor were applied to realize the IDCT calculation in two steps. Experimental results show that the algorithm only executes 530 instructions and occupies 1 424 bytes in memory when performing 8 × 8 IDCT calculation. The IDCT algorithm has relatively better practicability with higher real-time performance and less processor resource consumption.

关 键 词：RISC-DSP IDCT 视频图像处理 

分 类 号：TN919.81[电子电信—通信与信息系统]