A5100386571- Optical measurement and interference techniques
- Image Processing Techniques and Applications
- Advanced Vision and Imaging
- Advanced Measurement and Metrology Techniques
- Digital Holography and Microscopy
- 3D Surveying and Cultural Heritage
- Advanced Optical Imaging Technologies
- Advanced Optical Sensing Technologies
- Optical Systems and Laser Technology
- Advanced X-ray Imaging Techniques
- Random lasers and scattering media
- Advanced Electron Microscopy Techniques and Applications
- Advanced Measurement and Detection Methods
- Chaos-based Image/Signal Encryption
- earthquake and tectonic studies
- Optical Coherence Tomography Applications
- Genetic Mapping and Diversity in Plants and Animals
- Orbital Angular Momentum in Optics
- Advanced Fluorescence Microscopy Techniques
- Advanced Steganography and Watermarking Techniques
- Advanced Image Processing Techniques
- Surface Roughness and Optical Measurements
- Remote Sensing and Land Use
- Image and Object Detection Techniques
- Remote Sensing and LiDAR Applications
Henan University of Science and Technology
2025
Shenzhen University
2015-2024
China Earthquake Administration
2024
Space Telescope Science Institute
2023
Chinese Academy of Surveying and Mapping
2019-2023
China Agricultural University
2021
Yulin University
2021
Inner Mongolia University
2020
Ministry of Education of the People's Republic of China
2015-2016
Ocean University of China
2013
This paper makes use of Hilbert transform to analyze and compensate the phase error caused by nonlinear effect in shifting profilometry (PSP). The characteristics distribution domain was analyzed compared with spatial domain. A simple flexible compensation method proposed directly process phase-shifting fringe images without any auxiliary conditions or complicated computation. Experimental results demonstrated that can be reduced about 80% three-step PSP, more than 95% four step which...
We demonstrate in this paper that the traditional double random phase encoding (DRPE) technique is vulnerable to ciphertext-only attack (COA). In method, an unauthorized user (or say attacker) assumed be able retrieve corresponding plaintext from only ciphertext under some certain condition. The proposed scheme mainly relies on a hybrid iterative retrieval (HIPR) algorithm, which combines various algorithms. With estimation of number nonzero pixels (NNP) original plaintext, attacker could...
Abstract Fault maturity has been proposed to exert a first order control on earthquake rupture, yet direct observations linking individual rupture long‐term fault growth are rare. The 2021 Mw 7.4 Maduo ruptured the east‐growing end of slow‐moving (∼1 mm/yr) Jiangcuo in north Tibet, providing an opportunity examine relation between characteristics and structure. Here we combine field multiple remote sensing techniques map surface at cm‐resolution document comprehensively on‐fault offsets...
The measurement accuracy of fringe projection profilometry (FPP) largely depends on the calibration procedure. A more reliable approach based stereo vision model FPP scheme in conjunction with bundle adjustment strategy is presented. It can adjust coordinates benchmarks and thereby estimate parameters accurately even an imperfect target. experiment results shows that proposed reach highly accurate by solely using a printed target pattern, which verifies approach.
In this paper, we propose a method by means of light field imaging under structured illumination to deal with high dynamic range 3D imaging. Fringe patterns are projected onto scene and modulated the depth then is detected using recording devices. The contains information about ray direction phase-encoded depth, via which can be estimated from different directions. multidirectional estimation achieve effectively. We analyzed derived phase-depth mapping in proposed flexible ray-based...
Three-dimensional (3D) imaging and metrology of microstructures is a critical task for the design, fabrication, inspection microelements. Newly developed fringe projection 3D microscopy presented in this paper. The system configured according to camera-projector layout long working distance lenses. Scheimpflug principle employed make full use limited depth field. For such specific system, general model introduced reach reconstruction. A dedicated calibration procedure realize quantitative...
This Letter proposes a new strategy of three-dimensional (3D) scanning pipeline to achieve complete 3D digitization complex objects in real scene. consists one-dimensional array optical sensors combined with an automatically controlled turntable. An efficient calibration method for the sensor is presented guarantee accuracy measurement. Furthermore, automatic registration technique also proposed aligning multiple range images taken from array. Experiment results are demonstrate approach.
In previous work, we presented a structured light field (SLF) method combining imaging with illumination to perform multi-view depth measurement. However, the work just accomplishes rather than 3D reconstruction. this paper, propose novel active involving ray calibration and phase mapping, achieve SLF We performed for first time determine each metric spatio-angular parameters, making realize Based on parametric equation, further derived mapping in that spatial coordinates can be directly...
Two major methods for 3D reconstruction in fringe projection profilometry, phase-height mapping and stereovision, have their respective problems: the former has low-flexibility practical application due to system restrictions latter requires time-consuming homogenous points searching. Given these limitations, we propose a phase-3D method developed from back-projection stereovision model achieve flexible high-efficient profilometry. We showed that all dimensional coordinates (X, Y, Z), but...
Abstract Microlens array-based light-field imaging has been one of the most commonly used and effective technologies to record high-dimensional optical signals for developing various potential high-performance applications in many fields. However, use a microlens array generally suffers from an intrinsic trade-off between spatial angular resolutions. In this paper, we concentrate on exploiting diffuser explore novel modality imaging. We demonstrate that can efficiently angularly couple...
Micro-Electro-Mechanical System (MEMS) scanning is increasingly popular in 3D surface measurement with the merits of compact structure and high frame-rate. In this paper, we achieve real-time fringe structured reconstruction by using a uniaxial MEMS-based projector. To overcome limitations on projector lensless unidirectional projection, novel isophase plane model proposed, which laser line from regarded as an plane. Our directly establishes mapping relationship between phase spatial...
In a digital holographic microscopy (DHM) system, different microscope objectives (MOs) will introduce phase distortions and thus lead to measurement errors. To address this problem, we present simple flexible method compensate all by introducing an electrically tunable lens (ETL) in the reference arm for DHM system with multiple MOs. By exactly controlling external currents of ETL, can change wave front match introduced MOs without complex alignment or additional numerical postprocessing...
We propose a method to achieve the purpose of hierarchical authentication on basis two beams' interference and one-way hash function. For this security protection system, only if "phase key" password-controlled lock" user are verified simultaneously can one obtain permission visit confidential resources system. Moreover, scheme not check legality users but also verify their identity levels so as grant them corresponding access permissions. The process is straightforward; phase key lock...
To increase the measurement range of 3D microscopy, Scheimpflug adjustment, in which imaging plane is tilted with respect to telecentric lens plane, often employed. However, inclined will introduce certain distortion captured image, further affects accuracy reconstruction result. In this paper, a model was derived based on geometric optics theory. With it, caused by condition can be effectively corrected. Experimental results presented demonstrate feasibility and validity proposed method.
In phase-measuring profilometry, the lens distortion of commercial projectors may introduce additional bending carrier phase and thus lead to measurement errors. To address this problem, paper presents an adaptive fringe projection technique in which projected patterns is modified according projector distortion. After projecting these patterns, induced by eliminated. Experimental results demonstrate method be effective efficient suppressing for profilometry. More importantly, does not need...
We present a simple and effective compensation method for the off-axis tilt in common-path digital holographic microscopy (CPDHM) by introducing rotating operation on hologram. The proposed mainly requires reference hologram (DRH), which is rotated version of original one; it assumed to be easy obtain specimen's 180°. In this way, could removed subtracting retrieved phase DRH from hologram, but without any complex spectrum centering judgment, fitting procedures, or prior knowledge system....
Hilbert transform (HT) has been employed to compensate phase error arising from the nonlinear effect in shifting profilometry (PSP). However, most common situations, pure HT may lead a significant system error, which negative impact on subsequent compensation. In this paper, of non-stationary and non-continuous fringe is analyzed, then novel suppression approach presented. The cosine without direct current (DC) component reconstructed eliminate influence non-smooth reflectivity, fractional...