Gradient sky scene based nonuniformity correction and local weighted filter based denoising
Liu, R.; Wang, D. J.; Jia, P.; Che, X.
刊名Optik
2018
卷号174页码:748-756
关键词Nonuniformity correction Gradient sky scene Local weighted filter Residual isolated noise focal-plane arrays sensors Optics
ISSN号0030-4026
DOI10.1016/j.ijleo.2018.06.125
英文摘要The nonuniformity of infrared focal plane array (IRFPA) seriously affects the image quality and the measurement accuracy of the infrared detector system. Long-wave infrared (LWIR) detector has highly sensitivity and image unstable factors, and the nonuniformity tends to drift slowly with the change of the environment. In this paper, we propose a new nonuniformity correction (NUC) algorithm based on gradient sky scene. Firstly, we obtain the two-point calibration images at two different pitch angles in the pure sky without any cloud. And then, the gain and offset coefficients are calculated from the standard two-point NUC. Finally, the local weighted filter based denoising algorithm is employed to eliminate a few residual isolated noise. Computational result shows that the SNR gain of the proposed method is increased 2.50 dB compared to the standard two-point method based on uniform blackbody. Results indicate that the proposed algorithm exhibits a superior correction effect and has the advantage of low complexity which meets the real-time requirements.
内容类型期刊论文
源URL[http://ir.ciomp.ac.cn/handle/181722/61005]  
专题中国科学院长春光学精密机械与物理研究所
推荐引用方式
GB/T 7714
Liu, R.,Wang, D. J.,Jia, P.,et al. Gradient sky scene based nonuniformity correction and local weighted filter based denoising[J]. Optik,2018,174:748-756.
APA Liu, R.,Wang, D. J.,Jia, P.,&Che, X..(2018).Gradient sky scene based nonuniformity correction and local weighted filter based denoising.Optik,174,748-756.
MLA Liu, R.,et al."Gradient sky scene based nonuniformity correction and local weighted filter based denoising".Optik 174(2018):748-756.
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