A way to measure the target contrast in low light level based on image intensifier technology

Xiaofeng Bai; Zhong Hu; Feng Shi; Zhiwei Zuo; Qin Zhang; Shijun Yan

doi:10.1117/12.3046226

13 December 2024 A way to measure the target contrast in low light level based on image intensifier technology

Xiaofeng Bai, Zhong Hu, Feng Shi, Zhiwei Zuo, Qin Zhang, Shijun Yan

Author Affiliations +

Proceedings Volume 13498, AOPC 2024: Optoelectronics Testing and Measurement; 1349805 (2024) https://doi.org/10.1117/12.3046226
Event: Applied Optics and Photonics China 2024 (AOPC2024), 2024, Beijing, China

Abstract

Target contrast is an important factor that affects the accuracy of viewing distance evaluation result of low light level device. There is a great difference between night sky spectrum and day spectrum, and the contrast of night target is different from that of day, so it is very important to measure the night target contrast accurately. Based on the basic concept of contrast and the relationship between brightness and illumination, and according to the high matching between the spectral response characteristic of the 3rd image intensifier and starlight spectrum, the way to measure the night target contrast by image intensified CMOS is proposed in this paper. And a measuring device calibrated by standard light source of 2856K color temperature in the laboratory is founded. Then, the device calibrated is used to measure the target contrast in urban. The results show that the deviation of the target contrast measuring device based on image intensified CMOS is less than 6.5% after laboratory calibration, the target contrast measurement results in urban are consistent with the visual observation results, and the target contrast measurement results are reliable. The results in this paper can provide an effective measurement method to ensure the accuracy of viewing distance evaluation results of low light level device.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xiaofeng Bai, Zhong Hu, Feng Shi, Zhiwei Zuo, Qin Zhang, and Shijun Yan "A way to measure the target contrast in low light level based on image intensifier technology", Proc. SPIE 13498, AOPC 2024: Optoelectronics Testing and Measurement, 1349805 (13 December 2024); https://doi.org/10.1117/12.3046226

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KEYWORDS

Calibration

Image intensifiers

Light sources and illumination

Camouflage

Measurement devices

Testing and analysis

Imaging systems

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