Non-uniformity correction for infrared cameras with variable integration time based on two-point correction

Jie Wang; Wenqing Hong

doi:10.1117/12.2606134

24 November 2021 Non-uniformity correction for infrared cameras with variable integration time based on two-point correction

Jie Wang, Wenqing Hong

Author Affiliations +

Proceedings Volume 12061, AOPC 2021: Infrared Device and Infrared Technology; 1206115 (2021) https://doi.org/10.1117/12.2606134
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

Infrared cameras can benefit the extended dynamic range by changing the integration time, especially for infrared high dynamic range imaging. But many proposed non-uniformity correction methods based on the two-point correction model incur a degradation of image quality when the integration time changes from the calibrating values. The paper describes a linear infrared camera response model and uses it to analyze the failure of the two-point correction method when change integration time. The analysis result reveals that, with the linear response model, the two-point correction offset parameter needs to be updated according to the immediate integration time, and calculated by a linear equation. Thus, the non-uniformity correction method with the ability to vary the integration time arbitrarily is proposed. To reduce the impact of the nonlinearity in real response and the temporal noise on computing the correction parameters, a parameter calculation method is also proposed of using multiple images of different temperature uniform references under different integration times. The correction effect under arbitrary integration time of the proposed method is verified by correcting images of an extended-area blackbody from 5°C to 100°C covering a wide range of the integration times from 0.4ms to 26ms. The mean value of the non-uniformity of all blackbody images corrected by our method can reach about 0.1%.

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Jie Wang and Wenqing Hong "Non-uniformity correction for infrared cameras with variable integration time based on two-point correction", Proc. SPIE 12061, AOPC 2021: Infrared Device and Infrared Technology, 1206115 (24 November 2021); https://doi.org/10.1117/12.2606134

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KEYWORDS

Cameras

Infrared cameras

Nonuniformity corrections

Sensors

Image processing

Infrared imaging

Infrared radiation

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