互相关运算在银河飞腾DSP上的实现及优化  

Realization and Optimization of Cross-correlation Based on YHFT-QDSP

作　　者：杨琳[1] 吴家铸[1] 扈啸[1] 田希[1] 

机构地区：[1]国防科学技术大学计算机学院,长沙410073

出　　处：《计算机科学》2015年第11期53-55,共3页Computer Science

摘　　要：在信号处理领域中,互相关运算对于寻找未知信号中的特性具有重要的作用。互相关常被用于图像匹配、粒子图像测速等领域。针对互相关运算计算量大而实时系统中要求较快运算速度的问题,利用银河飞腾多核DSP(YHFT-QDSP)的FFT加速器完成二维FFT运算,在YHFT-QDSP上实现了互相关运算,从而提高了互相关运算在实时系统中的性能,并在此基础上针对输入数据大小的不同提出了若干优化的方法,进一步提高了互相关运算的性能。In the field of signal processing, cross-correlation plays an important role in finding an unknown signal＇s fea- ture. Cross-correlation is often used in areas such as image matching and particle image velocimetry. For large cross-cor- relation calculation and requirements of faster computing speed in real-time systems, in order to improve cross-correla- tion＇s performance in real-time systems, we used the FFT accelerators of YHFT-QDSP to achieve 2D-FFT. Cross-cor- relation was realized based on YHFT-QDSP and this paper proposed some optimizations based on the size of input to improve the performance of cross-correlation.

关 键 词：二维FFT 互相关 优化 银河飞腾DSP 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]