摘要
电阻阵列非均匀性校正技术一直都是国外相关科研机构的研究热点,目前主要的非均匀性校正技术有两种——稀疏网格法和flood法。与稀疏网格法相比,flood法的算法比较复杂,需要亚像素的相关知识,并且要充分考虑图像退化、映射比和配准精度对校正流程的影响,但是不需要处理大量的网格图像数据,因此校正耗时较短,而且更适用于低驱动电压的情况。在红外热像仪与电阻阵列1:1映射的情况下对电阻阵列flood法非均匀性校正技术进行了研究,提出了校正算法,阐述了电阻阵列投射的红外图像发生退化的过程,并对图像退化对校正算法的影响进行了研究。研究发现,图像退化将导致"边缘效应",有可能引起误校正,而且退化函数的尺度将影响校正算法的收敛速度。
As one of the most important factors influencing the performance of dynamic infrared scene generation system, the fidelity of the scenes that are being projected draws foreign R＆D attention. According to the foreign research papers, both the sparse grid and flood nonuniformity correction （NUC） techniques have been used successfully for correcting infrared projector fixed pattern noise. It is clear that each of them has advantages and drawbacks. In our earlier paper, the sparse grid technique was studied, and a refined method was developed according to the existing laboratory condition. Compared with the sparse grid technique, the flood technique needs complicated algorithms and sub-pixel knowledge. Besides, it needs to take the influences of image degeneration, mapping ratio and registration precision into count. But the flood technique is more accurate in the low radiance domain and the procedure takes shorter time, since it doesn＇t need to process large amount of grid image data. The flood nonuniformity correction algorithm is studied at the unity and non-unity mapping ratio condition, the NUC algorithm is introduced, the course of image degeneration of projected infrared image and the influences of image degeneration on the flood algorithm are studied in particular. According to the simulation result, edge effect appeared caused by image degeneration, and the width of point spread function influenced the convergence rate of the flood nonuniformity correction algorithm.
出处
《红外技术》
CSCD
北大核心
2010年第9期535-540,共6页
Infrared Technology
基金
某院重点平台建设项目
编号:WX07233
关键词
电阻阵列
非均匀性校正
flood法
图像退化
resistor array, nonuniformity correction（NUC）, flood, image degeneration
