Simulation of NLOS (non-line-of-sight) 3D imaging system

2017 ◽  
Author(s):  
Xiuqin Su ◽  
Jingyao Wu ◽  
Zhaoqi Wei ◽  
Jingjing Tan
Keyword(s):  
3D Imaging ◽  
Imaging System ◽  
Line Of Sight ◽  
Non Line Of Sight

Synthetic Wavelength Holography: Snapshot Non-Line-of-Sight Imaging with High-Resolution and Wide Field of View

2020 ◽  
Author(s):  
Florian Willomitzer ◽  
Prasanna Rangarajan ◽  
Fengqiang Li ◽  
Muralidhar Balaji ◽  
Marc Christensen ◽  
...  
Keyword(s):  
High Resolution ◽  
Imaging System ◽  
Scattered Light ◽  
Field Of View ◽  
Line Of Sight ◽  
Wide Field ◽  
Navigation Systems ◽  
Small Probe ◽  
Wide Field Of View ◽  
Non Line Of Sight

Abstract The presence of a scattering medium in the imaging path between an object and an observer is known to severely limit the visual acuity of the imaging system. We present an approach to circumvent the deleterious effects of scattering, by exploiting spectral correlations in scattered wavefronts. Our Synthetic Wavelength Holography (SWH) method is able to recover a holographic representation of hidden targets with high resolution over a wide field of view. The complete object field is recorded in a snapshot-fashion, by monitoring the scattered light return in a small probe area. This unique combination of attributes opens up a plethora of new Non-Line-of-Sight imaging applications ranging from medical imaging and forensics, to early-warning navigation systems and reconnaissance. Adapting the findings of this work to other wave phenomena will help unlock a wider gamut of applications beyond those envisioned in this paper.

Non-line-of-sight 3D imaging (Conference Presentation)

2018 ◽  
Author(s):  
Andreas Velten ◽  
Marco La Manna ◽  
Ji-Hyun Nam ◽  
Xioachun Liu
Keyword(s):  
3D Imaging ◽  
Line Of Sight ◽  
Non Line Of Sight

scholarly journals Dynamic non-line-of-sight imaging system based on the optimization of point spread functions

2021 ◽  
Author(s):  
chengquan pei ◽  
anke zhang ◽  
Yue Deng ◽  
Feihu Xu ◽  
Jiamin Wu ◽  
...  
Keyword(s):  
Imaging System ◽  
Line Of Sight ◽  
Point Spread Functions ◽  
Point Spread ◽  
Non Line Of Sight

Simulation Research of Non-line-of-sight Imaging System Based on Bidirectional Reflectance Distribution Function

2020 ◽  
Vol 49 (12) ◽  
pp. 157-169
Author(s):  
徐伟豪 Wei-hao XU ◽  
苏秀琴 Xiu-qin SU ◽  
汪书潮 Shu-chao WANG ◽  
朱文华 Wen-hua ZHU ◽  
陈松懋 Song-mao CHEN ◽  
...  
Keyword(s):  
Distribution Function ◽  
Imaging System ◽  
Line Of Sight ◽  
Bidirectional Reflectance Distribution Function ◽  
Bidirectional Reflectance ◽  
Simulation Research ◽  
Bidirectional Reflectance Distribution ◽  
Non Line Of Sight

Simulation Research of Non-line-of-sight Imaging System Based on Bidirectional Reflectance Distribution Function

2020 ◽  
Vol 49 (12) ◽  
pp. 157-169
Author(s):  
徐伟豪 Wei-hao XU ◽  
苏秀琴 Xiu-qin SU ◽  
汪书潮 Shu-chao WANG ◽  
朱文华 Wen-hua ZHU ◽  
陈松懋 Song-mao CHEN ◽  
...  
Keyword(s):  
Distribution Function ◽  
Imaging System ◽  
Line Of Sight ◽  
Bidirectional Reflectance Distribution Function ◽  
Bidirectional Reflectance ◽  
Simulation Research ◽  
Bidirectional Reflectance Distribution ◽  
Non Line Of Sight

scholarly journals Fast non-line-of-sight imaging with high-resolution and wide field of view using synthetic wavelength holography

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Florian Willomitzer ◽  
Prasanna V. Rangarajan ◽  
Fengqiang Li ◽  
Muralidhar M. Balaji ◽  
Marc P. Christensen ◽  
...  
Keyword(s):  
Imaging System ◽  
Scattered Light ◽  
Field Of View ◽  
Line Of Sight ◽  
Wide Field ◽  
Navigation Systems ◽  
Wide Field Of View ◽  
Wave Phenomena ◽  
Angular Field Of View ◽  
Non Line Of Sight

AbstractThe presence of a scattering medium in the imaging path between an object and an observer is known to severely limit the visual acuity of the imaging system. We present an approach to circumvent the deleterious effects of scattering, by exploiting spectral correlations in scattered wavefronts. Our Synthetic Wavelength Holography (SWH) method is able to recover a holographic representation of hidden targets with sub-mm resolution over a nearly hemispheric angular field of view. The complete object field is recorded within 46 ms, by monitoring the scattered light return in a probe area smaller than 6 cm × 6 cm. This unique combination of attributes opens up a plethora of new Non-Line-of-Sight imaging applications ranging from medical imaging and forensics, to early-warning navigation systems and reconnaissance. Adapting the findings of this work to other wave phenomena will help unlock a wider gamut of applications beyond those envisioned in this paper.

scholarly journals Non–line-of-sight imaging over 1.43 km

2021 ◽  
Vol 118 (10) ◽  
pp. e2024468118
Author(s):  
Cheng Wu ◽  
Jianjiang Liu ◽  
Xin Huang ◽  
Zheng-Ping Li ◽  
Chao Yu ◽  
...  
Keyword(s):  
Near Infrared ◽  
High Efficiency ◽  
Imaging System ◽  
Imaging Techniques ◽  
Optical Design ◽  
Low Noise ◽  
Light Transport ◽  
Line Of Sight ◽  
Wide Range ◽  
Non Line Of Sight

Non–line-of-sight (NLOS) imaging has the ability to reconstruct hidden objects from indirect light paths that scatter multiple times in the surrounding environment, which is of considerable interest in a wide range of applications. Whereas conventional imaging involves direct line-of-sight light transport to recover the visible objects, NLOS imaging aims to reconstruct the hidden objects from the indirect light paths that scatter multiple times, typically using the information encoded in the time-of-flight of scattered photons. Despite recent advances, NLOS imaging has remained at short-range realizations, limited by the heavy loss and the spatial mixing due to the multiple diffuse reflections. Here, both experimental and conceptual innovations yield hardware and software solutions to increase the standoff distance of NLOS imaging from meter to kilometer range, which is about three orders of magnitude longer than previous experiments. In hardware, we develop a high-efficiency, low-noise NLOS imaging system at near-infrared wavelength based on a dual-telescope confocal optical design. In software, we adopt a convex optimizer, equipped with a tailored spatial–temporal kernel expressed using three-dimensional matrix, to mitigate the effect of the spatial–temporal broadening over long standoffs. Together, these enable our demonstration of NLOS imaging and real-time tracking of hidden objects over a distance of 1.43 km. The results will open venues for the development of NLOS imaging techniques and relevant applications to real-world conditions.

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