阵列飞行时间实时非视域成像技术  

Technologies of real-time non-line-of-sight imaging based on time-of-flight array

作　　者：韩圆 李有治 纪珍辰 艾宏旭 姚家琦 王艳秋 郑福 孙志斌 HAN Yuan;LI Youzhi;JI Zhenchen;AI Hongxu;YAO Jiaqi;WANG Yanqiu;ZHENG Fu;SUN Zhibin(National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;North China Electric Power University,Beijing 102206,China)

机构地区：[1]中国科学院国家空间科学中心,北京100190 [2]中国科学院大学,北京100049 [3]华北电力大学,北京102206

出　　处：《光学精密工程》2025年第3期377-388,共12页Optics and Precision Engineering

基　　金：国家重点研发计划资助项目(No.2023YFC2604900,No.2023YFF0719800)。

摘　　要：为解决现有非视域成像技术存在的成像速度慢、成像范围小和成像系统复杂昂贵的问题,提出了阵列飞行时间实时非视域成像方法,建立面阵飞行时间三次散射非视域成像理论模型,研究了成像距离和光源照射角度对系统重建结果的影响及系统性能,构建飞行时间非视域三维成像的评价指标。该方法利用850 nm的调制激光作为光学信号源,以飞行时间相机作为传感器接收经中介面散射回的三次散射目标信号,通过解调算法获得的深度信息重建出隐藏的非视域场景目标。实验结果表明,该系统在3.5 m距离内,可实现中介面和非视域目标均为近朗伯体情况下对15 cm×19 cm×30 cm的石膏人像等小型目标的实时非视域场景重建,光源的照明角度在60°~90°内可调,非视域实时成像速度为2.0565 frame/s,像素规模为320×240,目标对应区域的最大像素规模为150×100,横向多个目标图像不发生混叠的最小距离为3.5 cm。本文提出的阵列飞行时间实时非视域成像技术的成像范围大、成像速度快且成像分辨率高、抗干扰能力强。To address the challenges associated with slow imaging speed,limited imaging range,and the complexity and high costs of existing non-line-of-sight(NLOS)imaging technologies,a novel real-time NLOS imaging method based on array time-of-flight(ToF)principles was proposed.A theoretical model for three-dimensional(3D)scattering NLOS imaging utilizing a planar array configuration was estab⁃lished,facilitating the investigation of the effects of imaging distance and light source illumination angle on system reconstruction outcomes and overall performance.An evaluation index for ToF NLOS 3D imaging was developed.This method employs an 850 nm modulated laser as the optical signal source,with a ToF camera functioning as the sensor to capture third-order forward scattering signals from concealed targets il⁃luminated through an intermediate plane.The hidden target is reconstructed using depth information ob⁃tained from a demodulation algorithm.Experimental results demonstrate that the system can achieve realtime NLOS reconstruction of small targets,such as a plaster statue measuring 15 cm×19 cm×30 cm,when both the intermediate plane and NLOS objects are approximated as Lambertian surfaces within a dis⁃tance of 3.5 m.The illumination angle of the light source can be adjusted between 60 and 90 degrees,re⁃sulting in a real-time imaging speed of 2.0565 frame/s.The system features a pixel resolution of 320×240,with a maximum target area pixel size of 150×100,and a minimum horizontal distance for multiple target images without aliasing of 3.5 cm.This paper introduces key technologies for real-time NLOS im⁃aging using array ToF,highlighting significant advancements in imaging range,speed,resolution,and in⁃terference resistance.

关 键 词：非视域成像 实时成像 阵列飞行时间 

分 类 号：O439[机械工程—光学工程]