液晶与显示2012，Vol.27Issue(4)：557-562,6.DOI:10.3788/YJYXS20122704.0557
空间相机异常响应图像处理方法
Processing Method for Abnormal Response of Space Camera Image in Orbit
摘要
Abstract
It is known that step-down response of CCD's part pixels, impact of high-energy particles and absorbed cosmic dust in space camera can all induce the black stripes for the camera image. For the camera in orbit for a long time, the image quality is seriously affected. By researching for the pre-launch calibration data, an algorithm based on the least square method and radiance retrieval was proposed to renormalize the image in orbit, which could make the black stripes in the image be effectively eliminated. Firstly, the gray levels of CCD pixels under different irradiation grades were collected, and the relation between the average gray level of all pixels and the corresponding irradiation values was established by the least square method, then the correction index of each pixel was worked out, and thus the correction index of the black stripes' corresponding pixels could be obtained by analyzing the laboratory radiometric calibration coefficients. Lastly, the real gray levels of the black strips were computed by the correction index matrix. The experiment results show that for the modified images, the black stripes can be removed effectively and the image quality is satisfactory.关键词
空间相机/黑色条纹/辐射定标/最小二乘/辐射亮度反演Key words
space camera/ black stripes/ radiation calibration/ least square/ radiance retrieval分类
航空航天引用本文复制引用
李宪圣,叶钊,任建伟,刘则洵,万志..空间相机异常响应图像处理方法[J].液晶与显示,2012,27(4):557-562,6.基金项目
国家“863”高技术研究发展计划基金资助项目(No.863-2-5-1-13B) （No.863-2-5-1-13B）
