Article
Engineering, Multidisciplinary
Bolin Cai, Lu Liu, Jun Wu, Xiangcheng Chen, Yuwei Wang
Summary: A new spatial-temporal binary coding method is proposed in this paper, using three binary patterns to reconstruct the 3D shape of measured objects. By combining spatial and temporal coding, it can effectively distinguish different fringe periods.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Hai Wang, Jun Hu, Haiqiang Fu, Changcheng Wang, Zhenhai Wang
Summary: A novel quality-guided 2-D InSAR phase unwrapping method via deep learning is proposed, separating the PU process into two stages for estimating ambiguity gradient and applying post-processing operations. Different strategies based on quality maps are adopted to address class imbalance, resulting in superior performance in restoring absolute phase.
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2021)
Article
Engineering, Multidisciplinary
Yantao He, Yongjian Zhu, Guofeng Qin, Yunbai Qin, F. Jiang, Kunkun Zheng, Jianping Zhong
Summary: The study combined fringe-reflection technology with a three-step phase-shifting approach, proposing a new quality weight MRGV to improve the PU algorithm, and utilizing the Southwell integration algorithm for 3D reconstruction, resulting in a 3.09% lower reconstruction error compared to other methods, demonstrating effective defect detection and accurate measurement of rotationally symmetrical surfaces.
Article
Geosciences, Multidisciplinary
Xia Xiang, Chen Chen, Hui Wang, Cheng Xing, Jiankang Chen, Hong Zhu
Summary: Phase unwrapping is a key technique in the ground-based Synthetic Aperture Radar (GB-SAR) technology used for geo-hazard monitoring. This paper proposes an improved phase unwrapping method that achieves three-dimensional phase unwrapping in time and space, providing high accuracy and efficiency in processing GB-SAR monitoring data.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Optics
Lu Li, Yi Zheng, Kun Yang, Xin Su, Yuwei Wang, Xiangcheng Chen, Yajun Wang, Beiwen Li
Summary: A dynamic 3D reconstruction framework based on a modified algorithm is proposed to improve the speed and accuracy of dynamic 3D shape measurement by reducing the number of measurement patterns and using phase error compensation method. Experiments demonstrate the effectiveness of the proposed framework in improving the speed of dynamic 3D shape measurement by 1/3.
OPTICS COMMUNICATIONS
(2021)
Article
Remote Sensing
Songbo Wu, Bochen Zhang, Xiaoli Ding, Naeem Shahzad, Lei Zhang, Zhong Lu
Summary: This study proposes a new method for MT-InSAR phase unwrapping, specifically designed for deformation monitoring in urban areas. The method isolates the propagation path of information by considering building height information and uses quality controllers for network adjustment and phase unwrapping error correction. Experimental results demonstrate the effectiveness of the proposed method in urban deformation monitoring.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Yu Shi, Ya-fei Qi, Gong-yu Lan, Qijun Wu, Bing Ma, Xian-yi Zhang, Ruo-yun Ji, Yu-jia Ma, Yang Hong
Summary: The study evaluated the value of multiparametric three-dimensional MR elastography in chronic hepatitis B and C, showing its potential in detecting early necroinflammation, distinguishing necroinflammation from liver fibrosis, and correlating with hepatic venous pressure gradient.
Article
Chemistry, Analytical
Jiangtao Liu, Peng Tian, Hongru Li, Hao Wei, Guoliang Deng, Shouhuan Zhou, Zeyu Ma, Wenwu Wang, Liang He
Summary: An improved three-frequency heterodyne synthesis phase unwrapping method is proposed to improve measurement accuracy, reduce noise effects, and increase equivalent phase frequency. Otsu segmentation is introduced for phase threshold judging, and the appropriate period combinations are also studied.
Article
Multidisciplinary Sciences
Philippe Garteiser, Gwenael Page, Gaspard d'Assignies, Helena S. Leitao, Valerie Vilgrain, Ralph Sinkus, Bernard E. Van Beers
Summary: The study aimed to evaluate the diagnostic value of multifrequency MR elastography in grading necro-inflammation in the liver. The multifrequency dispersion coefficient was found to be the most accurate in assessing necro-inflammatory activity, while the storage modulus was suitable for evaluating fibrosis.
SCIENTIFIC REPORTS
(2021)
Article
Optics
Peng Wang, Tao Peng, Shuhe Zhang, Fengya Lu, Zhensheng Zhong, Jun Li, Yi Wang, Jinhua Zhou
Summary: In this study, a sparse prior phase unwrapping (SPUP) algorithm was proposed to solve the wrapped phase problem in interferograms. By introducing L0-norm and L1-norm regularizations, the SPUP method exhibited strong denoising ability and high phase fidelity. It could effectively correct uneven background noise and phase shifting, demonstrating great potential in various interferometry measurements.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Kaiping Li, Ping Cai
Summary: Dual-wavelength or multi-wavelength digital holography expands the axial measurement range but is affected by noise enlargement. To address this, an unwrapping method based on synthetic-wavelength phase and searching process is proposed. Simulation analysis demonstrates the effectiveness of this noise suppression method. The feasibility of the proposed method is demonstrated in measuring a standard step.
OPTICAL ENGINEERING
(2023)
Article
Optics
Di Yang, Dayong Qiao, Changfeng Xia, Qing He
Summary: A speckle-assisted four-steps phase-shifting method is proposed for 3D measurements. Five structured light patterns, including four-steps phase-shifting fringe patterns and a speckle pattern, are used to complete the measurements and remove phase ambiguity. An adaptive horizontal scaling method is introduced to improve the speckle matching accuracy, and a voting strategy based on phase-connected regions is proposed to reduce computational overhead. Experimental results demonstrate superior performance with an accuracy of 0.21 mm.
Article
Computer Science, Interdisciplinary Applications
Cuixia Li, Yuanyuan Zhou, Yinghao Li, Shanshan Yang
Summary: A coarse-to-fine method is proposed in this study for pairwise 3D MR image rigid registration, aiming to improve registration accuracy through extracting image feature points, calculating grey histograms, and maximizing mutual information. Experimental results show that the proposed method outperforms traditional methods in terms of registration success rate and accuracy.
MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING
(2021)
Article
Radiology, Nuclear Medicine & Medical Imaging
Meryem Khalfallah, Sabrina Doblas, Adel Hammoutene, Felicia Julea, Catherine Postic, Dominique Valla, Valerie Paradis, Philippe Garteiser, Bernard E. Van Beers
Summary: In this study, the value of three-dimensional magnetic resonance elastography (MRE) visco-elastic parameters as markers of nonalcoholic steatohepatitis (NASH) and substantial fibrosis in mice with nonalcoholic fatty liver disease (NAFLD) was assessed. The results showed that the storage and loss moduli had good diagnostic performance for detecting substantial fibrosis in NAFLD.
JOURNAL OF MAGNETIC RESONANCE IMAGING
(2023)
Article
Optics
Lilian Lu, Zhoujie Wu, Qican Zhang, Chaowen Chen, Yueyang Li, Fengjiao Li
Summary: The paper introduces a 3D shape measurement method based on misaligned Gray-code (MGC) light to avoid order jump error, by pre-moving traditional Gray-code patterns before projection and dividing decoding order into sub-regions to construct correct phase order. Experimental results confirm the effectiveness of the method in achieving high-efficiency and high-speed 3D shape measurement.
OPTICS AND LASERS IN ENGINEERING
(2022)