Infrared and Laser Engineering, Volume. 51, Issue 5, 20210510(2022)
Non-uniformity correction algorithm of space-borne long-wave infrared focal plane arrays based on improved Gamma curve
Figures & Tables(7)
Fig. 1. (a) Schematic diagram of the original response characteristic curves of the IRFPA detector; (b) Schematic diagram of response characteristic curves after correcting by traditional linear correction algorithm
Fig. 2. (a) Algorithm flow step 1: get raw output of detector unit; (b) Algorithm step 2: non-linear mapping; (c) Algorithm step 3: linear non-uniformity correction; (d) Algorithm step 4: inverse non-linear mapping
Fig. 4. (a) Image gray distribution before correction; (b) Result for NUC of the proposed algorithm; (c) Result for NUC of typical curve fitting based algorithm;(d) Result for NUC of multi-point correction algorithm
Fig. 5. (a) Semi-real infrared remote sensing image before correction; (b) Result for NUC of the proposed algorithm; (c) Result for NUC of curve fitting based algorithm; (d) Result for NUC of multi-point correction algorithm
Table 1. Performance parameters of artificial blackbody images non-uniformity corrected by different algorithms
View tableView in ArticleTable 1. Performance parameters of artificial blackbody images non-uniformity corrected by different algorithms
Parameter Blackbody temperature/K Image before correction Image after correction Proposed algorithm Curve fitting based algorithm Multipoint correction algorithm Ur 340 22.86% 0.41% 0.59% 1.27% 305 14.40% 0.33% 0.31% 0.93% 275 9.86% 0.38% 0.39% 0.77% 240 8.23% 0.49% 0.44% 1.46% $ \rho $ 340 0.4800 0.0685 0.0739 0.0991 305 0.2851 0.0396 0.0411 0.0570 275 0.1843 0.0288 0.0251 0.0361 240 0.1687 0.0245 0.0260 0.0324
Table 2. Performance parameters of semi-real infrared remote sensing image non-uniformity corrected by different algorithms
View tableView in ArticleTable 2. Performance parameters of semi-real infrared remote sensing image non-uniformity corrected by different algorithms
Parameter Image before correction Image after correction Proposed algorithm Curve fitting based algorithm Multipoint correction algorithm Ur 13.69% 11.33% 11.62% 12.17% $ \rho $ 0.1193 0.0847 0.0893 0.1028
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Dabao Wang, Zhongguo Wang, Mingxuan Wu, Chao Zhang, Yue Hu. Non-uniformity correction algorithm of space-borne long-wave infrared focal plane arrays based on improved Gamma curve[J]. Infrared and Laser Engineering, 2022, 51(5): 20210510
Paper Information
Category: Infrared technology and application
Received: Jul. 22, 2021
Accepted: --
Published Online: Jun. 14, 2022
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