Modeling and simulation analysis of a non-line-of-sight infrared laser imaging system

2021 ◽  
Author(s):  
Jingjing Tan ◽  
Xiuqin Su ◽  
Kaidi Wang ◽  
Jingyao Wu
Keyword(s):  
Modeling And Simulation ◽  
Simulation Analysis ◽  
Imaging System ◽  
Infrared Laser ◽  
Line Of Sight ◽  
Laser Imaging ◽  
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.

Forward Reflection Characteristics of Typical Smooth Building Walls and the Simulation Analysis

2014 ◽  
Vol 513-517 ◽  
pp. 3601-3606
Author(s):  
Shen You Zhao ◽  
Kai Da Xu ◽  
Su Qiu ◽  
Wei Qi Jin ◽  
Hui Guo ◽  
...  
Keyword(s):  
Simulation Analysis ◽  
Specular Reflection ◽  
Forward Scattering ◽  
Line Of Sight ◽  
Angle Of Incidence ◽  
Imaging Technology ◽  
Reflective Surface ◽  
Building Walls ◽  
Reflection Characteristics ◽  
Non Line Of Sight

Non-line-of-sight optical imaging technology is a novel application of imaging technology developed recently, achieving the effective imaging of the corner, basements and other scenes which are difficult to be directly observed by traditional vision with intermediate reflective surface. Smooth building walls, such as tiles and marbles, are typical intermediate reflective surfaces. Because reflecting surface is neither ideal specular reflective nor Lambertian reflective, the reflection characteristics of the intermediate reflective surface have a significant impact on the non-line-of-sight imaging. Based on the test data of the spectral bidirectional reflectance distribution function (BRDF) of common smooth tiles, the surface transfer function and angle spread function of smooth tiles are established according to the Harvey-Shack surface scatter theory in the paper. And the descriptions of the characteristics of specular reflection and forward scattering are implemented. Furthermore, according to the measured BRDF data at a certain wavelength for a certain angle of incidence, we can predict the reflection and scattering distribution at any other wavelengths or for other incident angles. The simulation results indicate that the curves fitted by the model basically are in agreement with the measured data, so that the simulation of the specular reflection and the forward scattering in the model is valid.

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.

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