阵列飞行时间实时非视域成像技术

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（1.National Space Science Center，Chinese Academy ofSciences，Beijing 1Ooi9O，China; 2. University of Chinese Academy of Sciences，Beijing lOoo49，China; 3.North China Electric PowerUniversity，BeijinglO22O6，China） * Corresponding author， E -mail： zbsun@nssc. ac. cn

Abstract： 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 established，facilitating the investigation of the effects of imaging distance and light sourceiluminationangleon system reconstruction outcomes and overall performance. An evaluation index for ToF NLOS 3D imaging was developed. This method employs an 850nm 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 illuminated through an intermediate plane. The hidden target is reconstructed using depth information obtained from a demodulation algorithm. Experimental results demonstrate that the system can achieve realtime NLOS reconstruction of small targets，such as a plaster statue measuring 15cm×19cm×30cm ， when both the intermediate plane and NLOS objects are approximated as Lambertian surfaces within a distance of 3.5m . The illumination angle of the light source can be adjusted between 6O and 9O degrees，resulting in a real-time imaging speed of 2. O56 5 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 3.5cm . This paper introduces key technologies for real-time NLOS imaging using array ToF， highlighting significant advancements in imaging range，speed，resolution，and interference resistance.

Key words： non-line-of-sight imaging；real-time imaging；time-of-flight array

1引言

非视域（Non-line-of-sight，NLOS）成像指的是当目标处于“视线”之外，即“非视域"场景下人眼或探测器无法直接观察隐藏目标时的成像。（剩余14571字）