基于高光谱成像技术的微小摄像头检测技术  

Tiny camera detection technology based on hyper-spectral imaging technology

作　　者：汪林 张海洋[1,2] 黄嘉昊 屈嘉惠 赵长明[1,2] 张子龙 WANG Lin;ZHANG Haiyang;HUANG Jiahao;QU Jiahui;ZHAO Changming;ZHANG Zilong(Key Laboratory of Photoelectronic Imaging Technology and System(Ministry of Education),Beijing Institute of Technology,Beijing 100081,China;School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学光电成像技术与系统教育部重点实验室,北京100081 [2]北京理工大学光电学院,北京100081

出　　处：《应用光学》2021年第6期1107-1114,共8页Journal of Applied Optics

基　　金：国家科学化训练基地建设关键技术研究与示范基金(2018YFF0300802)。

摘　　要：针对高光谱成像特点,提出了一种基于三维特征检测微小摄像头的方案。在空间维利用猫眼效应筛选疑似目标,在光谱维对结果进行精准判定。依据摄像头结构,分析了可见光摄像头的反射光谱特征。基于几何光学和辐射度学,计算和仿真了系统的探测距离。结果表明,正常工作时,光功率影响最小探测距离,目标尺寸影响最大探测距离。搭建了微小摄像头光谱特征验证系统。结果表明,采用吸收型红外截止滤光片的目标的非反射光占比曲线变化平缓且数值高,采用反射型红外截止滤光片的目标的非反射光占比曲线可见光部分数值高,红外部分数值低,从700 nm附近开始下降,甚至发生突变,实验数据显示,突变位置的斜率绝对值是红外波段斜率绝对值的10倍以上。实验结果与预期分析的结果一致,验证了高光谱成像技术检测微小摄像头的可行性。Aiming at the characteristics of hyper-spectral imaging,a scheme for detecting tiny cameras based on three-dimensional features was proposed.The results were accurately determined in the spectral dimension after the suspected target was screened out by the cat's eye effect in the space dimension.According to the camera structure,the reflection spectral characteristics of the visible light camera were analyzed.Based on the geometric optics and radiometry,the detection distance of the system was calculated and simulated.The results show that if the equipment is working properly,the optical power affects the minimum detection distance,while the target size affects the maximum detection distance.A tiny-camera spectral feature verification system was built.The results show that the non-reflective light ratio curve of the target using the absorptive infrared cut-off filter changes smoothly and the value is high.As for the curve of the target using the reflective infrared cut-off filter,the value is high in visible light part while it is low in infrared part,and the curve begins to drop near 700 nm and even mutates where the absolute slope value is more than 10 times as it in the infrared band according to the experimental data.The experimental results are consistent with the expected results of the analysis,which proves the feasibility of hyper-spectral imaging technology to detect tiny cameras.

关 键 词：高光谱 微小摄像头 光谱特征 成像光谱 

分 类 号：TN06[电子电信—物理电子学] TN29