Effect of Luminance Gain on Image Quality of Third Generation Low-Light-Level Image Intensifier
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摘要: 为研究三代微光像增强器亮度增益对像质的影响，提出对不同增益条件下荧光屏输出图像的像质进行对比分析，以提高三代微光像增强器的成像质量。首先，在三代微光像增强器的理论基础上，论证了亮度增益会直接影响像增强器的成像质量。然后，通过图像质量评价的两个重要参数信噪比和分辨力，建立像质评价系统并搭建实验装置。最后，通过实验结果表明，在无月夜天光照度条件下，当亮度增益取得最佳值时，输出图像在视场明亮清晰的同时分辨力由32 lp/mm提升至40.3 lp/mm。证明该研究对夜间环境中，如何通过合理设置亮度增益值使微光夜视仪获得最佳成像质量具有指导意义。Abstract: To study the effect of the luminance gain of a third-generation low-light-level (LLL) image intensifier on the image quality, we compare and analyze the image quality of the output image under different gain conditions to improve the image quality of a third-generation image intensifier. First, based on the theory of the third-generation LLL image intensifier, it is proven that the luminance gain directly affects the image quality of the image intensifier. Then, via signal-to-noise ratio (SNR) and resolution, two important parameters of the image quality evaluation, image quality evaluation system, and experimental equipment, are set up. Finally, the experimental results show that under moonless illumination, when the luminance gain is at the optimal value, the resolution of the output image is increased from 32 lp/mm to 40.3 lp/mm while the field of view is bright and clear. It has been proven that this research has guiding significance in how to obtain the best image quality of LLL night vision instruments by reasonably setting the luminance gain value in the night environment.
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Key words:
- low-light-level image intensifier /
- luminance gain /
- image quality /
- signal-to-noise ratio /
- resolution
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图 2 三代微光像增强器像质评价系统
Figure 2. Image quality evaluation system of the third generation low-light-level image intensifier
图 3 微光像增强器亮度增益测量装置
Figure 3. Luminance gain measuring device for low-light image intensifier
图 5 三代微光像增强器亮度增益与信噪比的关系
Figure 5. The relationship between the luminance gain and SNR of the third generation low-light-level image intensifier
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