红外畸变图像并行校正快速实现算法研究  

Research on fast algorithm for parallel correction of distorted infrared image

作　　者：郑红[1,2] 李俊[1] 陈海霞[2] 李钊[1] 

机构地区：[1]北京航空航天大学自动化科学与电气工程学院,北京100191 [2]光电信息控制和安全技术重点实验室,三河065201

出　　处：《仪器仪表学报》2011年第11期2530-2535,共6页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(60543006);博士点基金(201003259);重点实验室基金(9140C150105100C1502)资助项目

摘　　要：在广角镜头热像仪目标检测与跟踪系统中,需要对红外图像进行畸变校正处理。目前常用的FPGA算法没有充分利用其并行机制,不仅耗用资源多,运行速度也受到一定限制。分析了常规FPGA畸变校正算法存在串行结构问题,提出充分并行的FPGA算法。根据径向畸变沿光学中心对称的特点,采用了4个并行处理单元进行校正处理,并且用较少的查找表资源实时计算校正地址。在进行双线性插值运算时,采用并行存取结构提高访问效率。通过在FPGA芯片上实验验证,表明该算法具有很好的实时性,占用资源较少,实现了在线实时校正畸变的功能。In target detection and tracking system of wide-angle lens infrared camera,we need to correct the distorted infrared image.Now,commonly used FPGA algorithm does not make full use of its parallel mechanism;not only the algorithm consumes more resources but also its operation speed is restricted in certain way.This paper analyzes the serial structural problems of existing conventional FPGA correction algorithm,puts forward a fully parallel algorithm.According to the symmetrical characteristic of radial distortion along optical center,four parallel processing units are used to do the correction processing,and less look-up table resources are used to calculate the correction address in real-time.A parallel access structure is adopted to improve the access efficiency in the bilinear interpolation operation.The experiments implemented on an FPGA chip produced by Xilinx company show that the proposed algorithm has a good real-time performance,uses less resources and realizes the function of real time on line distortion correction with FPGA.

关 键 词：并行计算 几何畸变 FPGA 

分 类 号：TP391.42[自动化与计算机技术—计算机应用技术]