Natural color low-level-light EBAPS imaging system based on three-color LCTF

Xuan LIU; Ruiqiang LI; Li LI; Weiqi JIN; Hongchang CHENG; Lei YAN; Zhou ZHENG

doi:10.5768/JAO202243.0604002

Journal of Applied Optics, Volume. 43, Issue 6, 1044(2022)

Natural color low-level-light EBAPS imaging system based on three-color LCTF

Xuan LIU1... Ruiqiang LI1, Li LI1,*, Weiqi JIN1, Hongchang CHENG2, Lei YAN2 and Zhou ZHENG2 |Show fewer author(s)

¹Key Laboratory of Photoelectronic Imaging Technology and System (Ministry of Education), School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China

²Science and Technology on Low-Light-Level Night Vision Laboratory, Xi'an 710065, China

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Fig. 1. Schematic diagram of EBAPS imaging principle

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Fig. 2. Experimental system of color low-level-light EBAPS image acquisition

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Fig. 3. Diagram of system model

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Fig. 4. Three-color LCTF and its controller of Meadowlark Optics

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Fig. 5. EBAPS and physical integrated system

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Fig. 6. Spectral responses of several typical photocathodes

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Fig. 7. Imaging overexposed areas and noise spots of EBAPS

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Fig. 8. Standard color checkers used in experiment

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Fig. 9. Spectral reflectance of color blocks

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Fig. 10. Color correction results calculated by two color space models and two regression methods

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Fig. 11. Image processing effect under different illuminance in scene 1

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Fig. 12. Image processing effect under different illuminance in scene 2

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Table 1. Regression method and its calculation form
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Table 1. Regression method and its calculation form
回归方法色彩校正矩阵T_CCM计算形式
QLSR $T_{CCM} = Q P^{T} {(P P^{T})}^{- 1}$
PLSR $T_{CCM} = Q P^{T} {(P P^{T} + λ I)}^{- 1}$

Table 2. Color space model
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Table 2. Color space model
颜色空间模型标准矩阵Q 测量矩阵P 变换形式
线性模型 $Q = [\begin{matrix} R_{S} & G_{S} & B_{S} \end{matrix}]$ $P = [\begin{matrix} R_{M} & G_{M} & B_{M} \end{matrix}]$ $Q^{T} = T_{CCM} P^{T}$
复合模型 $Q = [\begin{matrix} \ln (R_{S}) & \ln (G_{S}) & \ln (B_{S}) \end{matrix}]$ $P = [\begin{matrix} R_{M} & G_{M} & B_{M} & 1 \end{matrix}]$ $Q^{T} = T_{CCM} P^{T}$

Table 3. Image evaluation index parameters of scene 1

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Table 3. Image evaluation index parameters of scene 1

图像	色差/NBS			饱和度
图像	拉伸后图像	白平衡后图像	色彩校正图像	白平衡后图像	色彩校正图像
(a)	31.7691	29.7584	16.8068	0.1844	1.1775
(b)	31.1937	30.4833	18.9607	0.1635	1.0684
(c)	36.5345	29.0815	18.9607	0.2215	1.0684
(d)	30.4207	36.7243	20.2295	0.1331	1.1416
(e)	31.8976	41.8603	22.7804	0.1000	1.1341
(f)	34.1854	44.2036	25.6088	0.0947	1.1602
(g)	39.8942	48.1827	29.4266	0.0718	1.0503
(h)	49.5305	53.8235	27.1670	0.0285	0.8663

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Xuan LIU, Ruiqiang LI, Li LI, Weiqi JIN, Hongchang CHENG, Lei YAN, Zhou ZHENG. Natural color low-level-light EBAPS imaging system based on three-color LCTF[J]. Journal of Applied Optics, 2022, 43(6): 1044

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