Results 161 to 170 of about 6,973,682 (218)

PhaseNet 2.0: Phase Unwrapping of Noisy Data Based on Deep Learning Approach

IEEE Transactions on Image Processing, 2020
Phase unwrapping is an ill-posed classical problem in many practical applications of significance such as 3D profiling through fringe projection, synthetic aperture radar and magnetic resonance imaging.
G. Spoorthi, Rama Krishna Sai Subrahmanyam Gorthi, Subrahmanyam Gorthi   +2 more
semanticscholar   +1 more source

A Synthetic Aperture UHF RFID Localization Method by Phase Unwrapping and Hyperbolic Intersection

IEEE Transactions on Automation Science and Engineering, 2021
The use of radio frequency identification (RFID) technology for the traceability of products throughout the production chain, warehouse management, and the retail network is spreading in the last years, especially in those industries in line with the ...
P. Tripicchio, M. Unetti, Salvatore D’Avella, A. Buffi, A. Motroni, Fabio Bernardini, P. Nepa   +6 more
semanticscholar   +1 more source

New regularization scheme for phase unwrapping

Applied Optics, 1998
A new, to our knowledge, algorithm for the phase unwrapping (PU) problem that is based on stochastic relaxation is proposed and analyzed. Unlike regularization schemes previously proposed to handle this problem, our approach dispells the following two assumptions about the solution: a Gaussian model for noise and the magnitude of the true phase-field ...
GUERRIERO L, NICO G, PASQUARIELLO G, STRAMAGLIA, Sebastiano   +3 more
openaire   +3 more sources

Large-Gradient Interferometric Phase Unwrapping Over Coal Mining Areas Assisted by a 2-D Elliptical Gaussian Function

IEEE Geoscience and Remote Sensing Letters, 2022
Phase unwrapping (PU) is a key step in interferometric synthetic aperture radar (InSAR) surface monitoring, which is directly related to the accuracy of the line-of-sight (LOS) displacement observations. Underground coal mining generally results in large
Jiancun Shi, Zefa Yang, Li-Xin Wu, Jingjing Niu   +3 more
semanticscholar   +1 more source

Phase unwrapping by region growing

Applied Optics, 2003
The phase unwrapping problem consists in mingling out an integer field whose values make the original wrapped phase field continuous. Even if in principle the problem is very simple--a direct integration of the wrapped phase field suffices--in the presence of noise and/or undersampling, the solution is no longer unique and the direct integration ...
openaire   +3 more sources

Multiresolution phase unwrapping for SAR interferometry

IEEE Transactions on Geoscience and Remote Sensing, 1999
An approach to two-dimensional (2D) phase unwrapping for synthetic aperture radar (SAR) interferometry is presented, based on separate steps of coarse phase and fine phase estimation. A technique called adaptive multiresolution is introduced for local fringe frequency estimation, in which difference frequencies between resolution levels are estimated ...
Davidson, Gordon, Bamler, Richard
openaire   +2 more sources

Phase unwrapping of digital signals

IEEE Transactions on Acoustics, Speech, and Signal Processing, 1989
In order to unwrap the phase of a digital signal, the signal's z-plane zeros, which lie close to the unit circle, are located by repeatedly expanding the z-plane in small steps and detecting a zero's crossing of the unit circle. This detection is accomplished by determining the step which gives rise to a maximum change in the phase at any frequency ...
openaire   +1 more source

Phase Unwrapping Methods for D-InSAR

2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021
In addition to GPS and leveling, there are also synthetic aperture radar (SAR) measurements in the field of remote sensing. Differential interferometric SAR (D-InSAR) is a surface deformation measurement technology developed from synthetic aperture radar interferometry (InSAR).
Chen Xie, Mingcang Zhu, Yong He 0007, Zhanyong He, Fangrong Zhou, Juan Ren, Hongqiong Tang, Liutong Li, Zezhong Zheng, Tianming Shao, Zhongnian Li, Zhiyong Wang, Mingqi Li, Ling Jiang   +13 more
openaire   +2 more sources

Unwrapping highly wrapped phase using Nonlinear Multi Echo phase unwrapping

2015
The unwrapping problem has been a major topic of research for over a decade. A variety of algorithms were suggested, but a correct solution is by no means guaranteed. In addition, many of these techniques are timeconsuming issues. In this work, we propose a simple and fast method, which combines conventional temporal unwrapping with a nonlinear phase ...
Fatnassi C., Fatnassi C., Boucenna R., Zaidi H.   +3 more
openaire   +1 more source

Phase Unwrapping for Magnetic Resonance Thermometry

2001
Magnetic resonance thermometry enables temperature measurement in a noninvasive way. A representation oft he temperature is given by the phase shift ofthe MR signal[1]. Unfortunately, only “wrapped phase” is measured directly, yielding values between -π and +π. However only the true phase(“unwrapped phase”) is proportional to temperature.
Suprijanto, -, Vos, FM, Vogel, MW (M.), Vossepoel, AM, Vrooman, Henri   +4 more
openaire   +3 more sources