Article
Optics
Zhilong Su, Jiyu Pan, Lei Lu, Meiling Dai, Xiaoyuan He, Dongsheng Zhang
Summary: A novel refractive stereo-DIC method is proposed in this work to accurately reconstruct the true shape of submerged objects by considering light refraction. Experimental results show the feasibility and correctness of this approach, indicating its potential to extend stereo-DIC to fluid-immersed 3D deformation characterization.
Article
Optics
Tong Li, Shaohui Zhang, Yao Hu, Qun Hao
Summary: This paper proposes a method for 3D reconstruction of HDR scenes through joint design and optimization of hardware and algorithms, requiring only four frames. By temporally projecting two sets of complementary speckle patterns and using a stereo matching strategy, height information encoding and pattern decoding can be achieved effectively, improving matching speed and measurable dynamic range.
Article
Engineering, Multidisciplinary
Fuqiang Zhong, Chenggen Quan
Summary: The study introduces two stereo matching methods: SRSM based on stereo rectification and HTSM based on homography transformation, to improve the accuracy and efficiency of stereo DIC. While HTSM is mainly suitable for planar objects, it still has numerous applications.
Article
Optics
Xiao LI, Wei LI, Haijun Xin, Jingyu Zhou, Huaiyuan Chen, Xingpei Chen, Xiaokang Yin, Xin'an Yuan, Xin Ma
Summary: A single-lens multi-mirror laser stereo vision-based system is proposed for measuring the geometric parameters of internal threads. This system allows the measurement of three parameters in one setup by reproducing the three-dimensional tooth profiles of the threads. The system demonstrates high accuracy and efficiency through optimized structural parameters and short measurement time.
Article
Optics
Farhan Rahman, Gracious Ngaile, Tasnim Hassan
Summary: The development of stereo-DIC for small-scale multiaxial material testing is crucial, and a mathematical framework can overcome experimental setup challenges and optimize stereo-DIC setup for various applications.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Xiao Li, Wei Li, Xin Ma, Xin'an Yuan, Xiaokang Yin, Xingpei Chen, Jianming Zhao
Summary: The feasibility and accuracy of tour-mirror-based monocular stereo vision (FMSV) are related to the system layout and calibration accuracy. In this study, a spatial light path analysis method and calibration method are proposed to refine the system design and improve accuracy. A DoF-distortion equal-partition-based model is established to propose an accurate and practical FMSV calibration method without constraint. The proposed vision system achieves high accuracy with an average error of 0.031 mm.
Article
Optics
Xueyan Huang, Yueyi Zhang, Zhiwei Xiong
Summary: This paper presents an event-based structured light system for high-speed 3D scanning, utilizing an event camera and a high-speed digital light projector. By triggering events with a blinking pseudo-random pattern generated by the projector, event frames are generated and digital image correlation is used to calculate displacements for deriving 3D surfaces of target objects.
Article
Optics
Aoyu Lin, Rui Li, Zhenyu Jiang, Shoubin Dong, Yiping Liu, Zejia Liu, Licheng Zhou, Liqun Tang
Summary: Path independent strategy is introduced into stereo digital image correlation, achieving high accuracy through the IC-GN algorithm. Two robust methods are developed for initial guess estimation, one using SIFT features and the other aided by epipolar constraint. Real-time stereo DIC is realized with high computation efficiency.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Devan Atkinson, Thorsten Hermann Becker
Summary: Digital Image Correlation (DIC) is widely used for measuring full-field displacements and deformations, with Stereo-DIC receiving more attention than 2D DIC due to its ability to account for out-of-plane displacements. However, there is a lack of resources covering the theory and implementation of Stereo-DIC. This paper addresses this gap by presenting a subset-based Stereo-DIC framework that is both theoretically sound and practically reliable.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Multidisciplinary
Zeren Gao, Yue Gao, Yong Su, Yang Liu, Zheng Fang, Yaru Wang, Qingchuan Zhang
Summary: A calibration method for stereo camera with large field of view using zoom lenses was proposed, employing Magill's formula to calculate intrinsic parameters with small and large object distances. Extrinsic parameters were calibrated in small FOV using a regular sized calibration board and then calculated in large FOV. Verification experiments showed a 3D reconstruction error of approximately 1 mm for a FOV of about 6 x 6 m, indicating the method will broaden the application range for 3D digital image correlation in scientific and engineering fields.
Article
Optics
Xinxing Shao, Xiaoyuan He
Summary: Stereo-digital image correlation (stereo-DIC) has become a standard technique for determining mechanical properties of materials and structures. However, in certain situations like drop tests or seismic shaking, camera motion can introduce significant errors on measured results. This study examines the influence of camera motion on stereo-DIC, specifically focusing on pair motion and relative motion, introducing a speckle-based compensation method for the latter to reduce systematic errors.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Energy & Fuels
Xiangchao Shi, Dandan Li, Junhai Chen, Yan Chen
Summary: The 3D digital rock technology is widely used in analyzing rock physical properties and reservoir modeling. This article proposes an innovative algorithm for reconstructing 3D digital rock by improving the generator, discriminator, and noise vector in the network structure. The proposed method achieves good agreement with real samples in terms of various geological parameters.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2023)
Article
Computer Science, Information Systems
Aziz Fajar, Riyanarto Sarno, Chastine Fatichah, Achmad Fahmi
Summary: In this paper, we propose an algorithm for reconstructing 3D images based on medical images in the DICOM format. The algorithm allows resizing of the 3D images while preserving the annotations and can handle various DICOM files.
JOURNAL OF KING SAUD UNIVERSITY-COMPUTER AND INFORMATION SCIENCES
(2022)
Article
Engineering, Mechanical
Zhilong Su, Jiyu Pan, Shuiqiang Zhang, Shen Wu, Qifeng Yu, Dongsheng Zhang
Summary: The stereo digital image correlation (stereo-DIC) technique demonstrates potential in characterizing 3D dynamic deformation of underwater rotor blades by tackling challenges in underwater applications. Improved methods are proposed for calibration and refraction 3D reconstruction, showing the feasibility and accuracy of the system and techniques for monitoring underwater rotating structures.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Chemistry, Analytical
Junhui Mei, Xiao Yang, Zhenxin Wang, Xiaobo Chen, Juntong Xi
Summary: This paper proposes a topology-based stereo matching method for 3D measurement using a single pattern of coded spot-array structured light. Experimental results demonstrate that the proposed technique can successfully decode each spot and establish stereo matching relation, achieving the goal of 3D reconstruction.
Article
Automation & Control Systems
Fuqiang Zhong, Songping He, Bin Li
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2017)
Article
Engineering, Electrical & Electronic
Fuqiang Zhong, Chenggen Quan
IEEE SENSORS JOURNAL
(2018)
Article
Engineering, Multidisciplinary
Fu Q. Zhong, Padmeya P. Indurkar, Cheng G. Quan
Article
Engineering, Multidisciplinary
F. Q. Zhong, X. X. Shao, C. Quan
MEASUREMENT SCIENCE AND TECHNOLOGY
(2018)
Article
Optics
F. Zhong, C. Quan
OPTICS AND LASER TECHNOLOGY
(2018)
Article
Physics, Applied
Fuqiang Zhong, Ravi Kumar, Chenggen Quan
APPLIED PHYSICS LETTERS
(2019)
Article
Optics
Ravi Kumar, Fuqiang Zhong, Chenggen Quan
Article
Engineering, Electrical & Electronic
Fuqiang Zhong, Ravi Kumar, Chenggen Quan
IEEE SENSORS JOURNAL
(2019)
Article
Optics
Xinxing Shao, Fuqiang Zhong, Wei Huang, Xiangjun Dai, Zhenning Chen, Xiaoyuan He
Article
Engineering, Multidisciplinary
Fuqiang Zhong, Chenggen Quan
Summary: The study introduces two stereo matching methods: SRSM based on stereo rectification and HTSM based on homography transformation, to improve the accuracy and efficiency of stereo DIC. While HTSM is mainly suitable for planar objects, it still has numerous applications.
Article
Optics
Xiangyang Xu, Xiangyun Ren, Fuqiang Zhong, Chenggen Quan, Xiaoyuan He
OPTICS AND LASERS IN ENGINEERING
(2020)
Article
Optics
Huisi Miao, Fuqiang Zhong, Changyan Xiao, Wei Huang, Chuhan Wu, Chenggen Quan
Summary: This study introduces a visualized simulation platform based on the 3ds Max engine, evaluates the performance of digital speckle patterns in the SPP technique comprehensively, and conducts experiments on 3D profile reconstruction. The study finds that the typical painted speckle pattern has limited effectiveness in the field of SPP.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Engineering, Biomedical
Fuqiang Zhong, Bingrui Wang, Junchao Wei, Yi Hua, Bo Wang, Juan Reynaud, Brad Fortune, Ian A. Sigal
Summary: In this study, a high-accuracy and high-efficiency digital volume correlation (DVC) method was proposed to characterize the in-vivo deformation of the optic nerve head (ONH) using optical coherence tomography (OCT) volumes. The proposed method overcame challenges faced by conventional DVC methods and demonstrated accurate displacement and strain calculations with reduced computation time and memory usage. The study highlights the potential of this method for investigating ONH biomechanics.
ACTA BIOMATERIALIA
(2022)
Meeting Abstract
Ophthalmology
Ian A. Sigal, Fuqiang Zhong, Yi Hua, Junchao Wei, Manik Bansal, Juan Reynaud, Brad Fortune
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2021)
Article
Optics
Yin Xiao, Lina Zhou, Wen Chen
Summary: This paper introduces a correspondence imaging approach for reconstructing high-quality objects through complex scattering media. By deriving a rectified theory and introducing temporal correction, the proposed method eliminates the effect of dynamic scaling factors. Experimental results demonstrate the advantages of the proposed method over conventional methods in complex scattering environments, and it can also be combined with other methods to further enhance the quality of reconstructed objects.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Zengxuan Jiang, Minghao Chao, Qingsong Liu, Bo Cheng, Guofeng Song, Jietao Liu
Summary: In this paper, a multi-focal metalens with high focusing efficiency controlled by circular polarization multiplexing is demonstrated. The metalens can generate four transversely distributed focal points under normal incidence of linearly polarized light, supporting both left-circularly polarized and right-circularly polarized conversion. Furthermore, an oblique incidence metalens is designed to achieve high total focusing efficiency for terahertz waves and provides potential new applications for polarization imaging and detection.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Yiran Wang, Yu Ji, Xuyang Zhou, Xiu Wen, Yutong Li, Zhengjun Liu, Shutian Liu
Summary: This work presents a new reconstruction framework for structured illumination microscopy (SIM), which only requires four raw images and avoids extensive iterative computation. By using checkerboard pattern illumination modulation instead of sinusoidal fringe illumination, the proposed method significantly reduces image acquisition time and achieves higher image reconstruction rate. Additionally, the reconstruction process is non-iterative and not limited by the field of view size.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Qian He, Li Pei, Jianshuai Wang, Jingjing Zheng, Tigang Ning, Jing Li
Summary: This paper proposes a 3D refractive index profile visualization method to demonstrate mode activation and evolution in fiber fusion splicing. The method is validated through experimental results and provides support for various fiber splicing operations and mode coupling modulation.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Qiwei Li, Qiyu Wang, Fang Lu, Yang Cao, Xu Zhao
Summary: LSHIP is a lenslet-array-based snapshot hyperspectral imaging polarimeter that combines spectral polarization modulation with integral field imaging spectrometry. It can simultaneously acquire three-dimensional spatial and spectral data-cubes for linear Stokes parameters in a single snapshot.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Huicong Li, Bing Lv, Meng Tian, Wenzhu Huang, Wentao Zhang
Summary: This study proposes a temperature compensation scheme for unbalanced interferometers using sensing fibers with different temperature coefficients, aiming to resolve the temperature disturbance and achieve high strain resolution. The experimental results confirm the effectiveness of the proposed scheme in high-resolution, long-term, low-frequency, and static strain sensing.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Hongxiang Chang, Rongtao Su, Yuqiu Zhang, Bowang Shu, Jinhu Long, Jinyong Leng, Pu Zhou
Summary: High-speed variable-focus optics provides new opportunities for fiber laser applications in various fields. This paper investigates a non-mechanical axial focus tuning method using coherent beam combining (CBC) technique and proposes a tilt modulation assisted method to extend the tuning range.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Yubo Ni, Shuai Fu, Chaoyang Su, Zhaozong Meng, Nan Gao, Zonghua Zhang
Summary: This paper proposes a surface adaptive fringe pattern generation method to accurately measure specular surfaces, eliminating the out-of-focus effect and improving measurement accuracy and reliability.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Zifan Wang, Tianfeng Zhou, Qian Yu, Zihao Zeng, Xibin Wang, Junjian Hu, Jiyong Zeng
Summary: Fast-axis collimation (FAC) lens arrays are crucial in laser systems, and their precision can be improved through the development of an optical collimation system and the use of thermal compensation to correct for non-uniform thermal expansion.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Jincheng Chen, Qiuyu Fang, Li Huang, Xin Ye, Luhong Jin, Heng Zhang, Yinqian Luo, Min Zhu, Luhao Zhang, Baohua Ji, Xiang Tian, Yingke Xu
Summary: This study developed a novel deep learning accelerated SRRF method that enables super-resolution reconstruction with only 5 low SNR images, and allows real-time visualization of microtubule dynamics and interactions with CCPs.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Pan Liu, Yongqiang Zhao, Ning Li, Kai Feng, Seong G. Kong, Chaolong Tang
Summary: This article presents a technique for inverse design of multilayer deep-etched gratings (MDEG) using a deep neural network with adaptive solution space. The proposed method trains a deep neural network to predict the probability distribution across the discretized space, enabling evaluation of an optimal solution. The results show improved efficiencies using only a reduced dataset and avoiding one-to-many mapping challenges.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Evelina Bibikova, Nazar Al-wassiti, Nataliya Kundikova
Summary: Light beams possess three types of angular momentum, namely spin angular momentum, extrinsic orbital angular momentum, and intrinsic orbital angular momentum. The interaction between these momenta leads to the spin-orbit interaction of light and topological effects. This study predicts a new topological effect resulting from the influence of extrinsic orbital angular momentum on spin angular momentum in converging asymmetrical light beams. It manifests as the transformation of linear polarized light into elliptically polarized light when an asymmetrical beam passes through the left or right half of the focal plane. The measured value of the topological circular amplitude anisotropy R was found to be R = +/- (0.60 +/- 0.08) x 10(-3). This new effect contributes to our understanding of light and has potential applications in developing sensors in optics.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Hamdy H. Wahba
Summary: This study combines multiple-beam Fizeau interference and single-shot digital holographic interferometry to study thick phase objects. By collecting optical phase at different focal planes, the angular spectrum method is used for the first time to retrieve optical phase maps through the focal depth. The proposed method proves to be effective in providing accurate numerical focusing and phase maps reconstruction.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Mohammed A. Isa, Richard Leach, David Branson, Samanta Piano
Summary: Due to the complexity of resolving object form and pose in images, new vision algorithms prioritize identification and perception over accurate coordinate measurement. However, the use of planar targets for coordinate measurement in vision systems has several drawbacks, including calibration difficulties and limited viewing angles. On the other hand, the use of sphere targets is infrequent in vision-based coordinate metrology due to the lack of efficient multi-view vision algorithms for accurate sphere measurements.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Ildar Rakhmatulin, Donald Risbridger, Richard M. Carter, M. J. Daniel Esser, Mustafa Suphi Erden
Summary: This paper reviews the application of machine learning in laser systems. While machine learning has been widely used in general control automation and adjustment tasks, its application in specific tasks requiring skilled workforces for high-precision equipment assembly and adjustment is still limited. The paper presents promising research directions for using machine learning in mirror positional adjustment, triangulation, and optimal laser parameter selection, based on the recommendations of PRISMA.
OPTICS AND LASERS IN ENGINEERING
(2024)