An efficient interpolation‐free algorithm for cylindrical millimeter‐wave holographic three‐dimensional reconstruction

Zhang, Ye; Jiang, Xinrui; Ma, Zhaoyang; Yang, Qi; Zeng, Yang; Deng, Bin; Wang, Hongqiang

doi:10.1002/mop.32657

Cited by 3 publications

(3 citation statements)

References 9 publications

(17 reference statements)

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“…Recently, point cloud data has been utilized in 3D surface reconstruction using Cylindrical Millimeter‐Wave (MMW) holography based on the active array‐based radar imaging mechanism. [ 16 ] Compared to conventional synthetic aperture radar (SAR) systems, MMW system antennas span a wide beamwidth leading to a relatively large aperture range of 60°. Hence, a wideband signal can be achieved, together with Ultra‐High Definition (UHD) 3D image projection.…”

Section: Introductionmentioning

confidence: 99%

Accelerated Augmented Reality Holographic 4k Video Projections Based on Lidar Point Clouds for Automotive Head‐Up Displays

Skirnewskaja,

Montelongo,

Sha

et al. 2023

Advanced Optical Materials

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Identifying road obstacles hidden from the driver's field of view can ensure road safety in transportation. Current driver assistance systems such as 2D head‐up displays are limited to the projection area on the windshield of the car. An augmented reality holographic point cloud video projection system is developed to display objects aligned with real‐life objects in size and distance within the driver's field of view. Light Detection and Ranging (LiDAR) point cloud data collected with a 3D laser scanner is transformed into layered 3D replay field objects consisting of 400 k points. GPU‐accelerated computing generated real‐time holograms 16.6 times faster than the CPU processing time. The holographic projections are obtained with a Spatial Light Modulator (SLM) (3840×2160 px) and virtual Fresnel lenses, which enlarged the driver's eye box to 25 mm × 36 mm. Real‐time scanned road obstacles from different perspectives provide the driver a full view of risk factors such as generated depth in 3D mode and the ability to project any scanned object from different angles in 360°. The 3D holographic projection technology allows for maintaining the driver's focus on the road instead of the windshield and enables assistance by projecting road obstacles hidden from the driver's field of view.

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Section: Introductionmentioning

confidence: 99%

Accelerated Augmented Reality Holographic 4k Video Projections Based on Lidar Point Clouds for Automotive Head‐Up Displays

Skirnewskaja,

Montelongo,

Sha

et al. 2023

Advanced Optical Materials

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show abstract

“…Computational imaging simulation is challenging due to a long distance of free space involved, especially at THz band of tiny mesh size. Thus, targets are usually simplified models like simple points, small scatters or metallic plates [2], [17], [34], [41], [42]. The proposed approach is capable of modelling various imaging scenarios.…”

Section: Introductionmentioning

confidence: 99%

Advanced THz MIMO Sparse Imaging Scheme Using Multipass Synthetic Aperture Focusing and Low-Rank Matrix Completion Techniques

Shu

Alfadhl

et al. 2022

IEEE Trans. Microwave Theory Techn.

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This paper proposes an advanced THz multipleinput-multiple-output (MIMO) near-field sparse imaging scheme for target detection that uses single-pass synthetic aperture focusing and multi-pass interferometric synthetic aperture focusing techniques to improve imaging effectiveness and efficiency. It benefits from the MIMO of linear sparse periodic array (SPA) and random sparse imaging to reduce sampling data as well as system cost. Both simulated and proof-of-concept experimental results have verified the scheme, revealing that the single-pass synthetic aperture imaging approach is sufficient to identify pure metallic targets with 3.87% of λ/2 sampling data. And multi-pass interferometric synthetic aperture imaging approach is capable of improving image quality on image signal to noise ratio and contrast, which is ideal for detecting more challenging targets. The random sparse imaging with help of low rank matrix completion (LRMC) technique has shown promising potential of achieving equivalent image quality when further reducing 43.75% data in the experiment of 5-pass imaging on a complex target, this corresponds to 82.51% data reduction compared to λ/2 sampling.

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“…In [18], the authors proposed a method that can realize similar imaging performance as the traditional multichannel MIMO radar by a single transmit/receive channel instead of a large number of transmit/receive channels. An efficient interpolation-free algorithm (IFA) applied for cylindrical millimeter wave (MMW) holographic three-dimensional (3D) reconstruction has also been proposed [19], which can efficiently achieve high-quality 3D reconstruction within the region of interest (ROI). A series of array configurations were designed to explore the impact of different array positions on the cross-range imaging performance in [20], and a novel fast fully focused imaging algorithm with wavenumber domain properties that is not constrained by the positions of the transmitters and receivers was presented.…”

Section: Introductionmentioning

confidence: 99%

A Range Resolution Enhancement Algorithm for Active Millimeter Wave Based on Phase Unwrapping Mechanism

2021

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Traditional security check technology is mainly based on metal detection by manual inspection. This method is simple and convenient, can detect a few different kinds of contrabands, and also takes into account the safety of inspectors. Because of its strong penetration characteristics, millimeter waves make up for the deficiency of existing security check technologies. Therefore, it is urgent to research and develop millimeter wave holographic imaging technology for human security inspection. In traditional imaging methods, the azimuthal resolution can be improved through various methods of image processing, but the traditional way to improve the range direction resolution is to increase the system bandwidth. However, improvements of the system bandwidth will greatly increase the cost. The bandwidth improvement space is also limited, so it cannot be expanded indefinitely in practical applications. In this study, the interferometric synthetic aperture theory was used to improve the range direction resolution of 3D millimeter wave holographic images without improving the system bandwidth. Phase unwrapping was used to reconstruct the phase information of complex images and restore the continuous phase distribution of the target object so as to achieve improvement of the range direction resolution without increasing the system bandwidth. This work has theoretical guiding significance to improve the range resolution of millimeter wave imaging.

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An efficient interpolation‐free algorithm for cylindrical millimeter‐wave holographic three‐dimensional reconstruction

Cited by 3 publications

References 9 publications

Accelerated Augmented Reality Holographic 4k Video Projections Based on Lidar Point Clouds for Automotive Head‐Up Displays

Accelerated Augmented Reality Holographic 4k Video Projections Based on Lidar Point Clouds for Automotive Head‐Up Displays

Advanced THz MIMO Sparse Imaging Scheme Using Multipass Synthetic Aperture Focusing and Low-Rank Matrix Completion Techniques

A Range Resolution Enhancement Algorithm for Active Millimeter Wave Based on Phase Unwrapping Mechanism

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