减小光强不均对CCD非均匀性校正的影响  

Reducing the influence of non-uniformity of luminous intensity on the inhomogeneity correction for CCD

作　　者：苏成志 陈栋[1] 曹国华[1] 徐洪吉[1] 

机构地区：[1]长春理工大学机电工程学院,吉林长春130022

出　　处：《红外与激光工程》2011年第4期680-684,共5页Infrared and Laser Engineering

基　　金：教育部新世纪优秀人才支持计划(NCET-05-0325)

摘　　要：在校正CCD传感器非均匀性过程中,发现光强不均对CCD非均匀性校正精度有很大影响。为了提高校正精度,提出了利用曲面拟合光强分布减小其对不均匀性校正影响的方法。此法根据CCD非均匀性具有随机性,应用最小二乘法拟合光强分布曲面,再从CCD标定数据中去除该曲面,从而减小光强不均对CCD非均匀性校正的影响。实验证明:随着光强的增大光强不均性亦增大,其引起的校正误差可达1.9%。采用曲面拟合光强分布能够有效减小光强不均引进的误差,提高CCD非均匀性校正精度。In the process of correcting the inhomogeneity of CCD sensor,it was found that the non-uniformity of luminous intensity had a great influence on the correction precision of inhomogeneity of CCD.In order to improve the correction precision,a method based on curved surface fitting was proposed to eliminate the influence upon the non-uniformity of luminous intensity.According to the fact that the inhomogeneity of CCD is random,the distribution surface of luminous intensity was fitted with least square method and then the curved surface was taken off from the calibration data of CCD,so that the influence of non-uniformity of luminous intensity on the correction of inhomogeneity of CCD was reduced.Experimental result indicates that the more the non-uniformity of luminous intensity is strengthened,the more the luminous intensity is increased,and the correction error derived from that will be up to 1.9%.The method based on curve surface fitting can efficiently reduce the error due to the non-uniformity of luminous intensity and also improve the correction precision of inhomogeneity of CCD.

关 键 词：光强不均 曲面拟合 CCD校正 非均匀性 

分 类 号：TN215[电子电信—物理电子学]