Non-uniformity calibration for MWIR polarization imagery obtained with integrated microgrid polarimeters

Hai-Zheng Liu; Ze-Lin Shi; Bin Feng; Bin Hui; Yao-Hong Zhao

doi:10.1117/12.2268322

8 March 2017 Non-uniformity calibration for MWIR polarization imagery obtained with integrated microgrid polarimeters

Hai-Zheng Liu, Ze-Lin Shi, Bin Feng, Bin Hui, Yao-Hong Zhao

Proceedings Volume 10255, Selected Papers of the Chinese Society for Optical Engineering Conferences held October and November 2016; 102554D (2017) https://doi.org/10.1117/12.2268322
Event: Selected Papers of the Chinese Society for Optical Engineering Conferences held October and November 2016, 2016, Jinhua, Suzhou, Chengdu, Xi'an, Wuxi, China

Abstract

Integrating microgrid polarimeters on focal plane array (FPA) of an infrared detector causes non-uniformity of polarization response. In order to reduce the effect of polarization non-uniformity, this paper constructs an experimental setup for capturing raw flat-field images and proposes a procedure for acquiring non-uniform calibration (NUC) matrix and calibrating raw polarization images. The proposed procedure takes the incident radiation as a polarization vector and offers a calibration matrix for each pixel. Both our matrix calibration and two-point calibration are applied to our mid-wavelength infrared (MWIR) polarization imaging system with integrated microgrid polarimeters. Compared with two point calibration, our matrix calibration reduces non-uniformity by 30~40% under condition of flat-field data test with polarization. The ourdoor scene observation experiment indicates that our calibration can effectively reduce polarization non-uniformity and improve the image quality of our MWIR polarization imaging system.

Citation Download Citation

Hai-Zheng Liu, Ze-Lin Shi, Bin Feng, Bin Hui, and Yao-Hong Zhao "Non-uniformity calibration for MWIR polarization imagery obtained with integrated microgrid polarimeters", Proc. SPIE 10255, Selected Papers of the Chinese Society for Optical Engineering Conferences held October and November 2016, 102554D (8 March 2017); https://doi.org/10.1117/12.2268322

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