Results 1 to 10 of about 22,111 (245)

DIP-UP: Deep Image Prior for Unwrapping Phase

Information
Phase images from gradient echo MRI sequences reflect underlying magnetic field inhomogeneities but are inherently wrapped within the range of −π to π, requiring phase unwrapping to recover the true phase.
Xuanyu Zhu, Yang Gao, Zhuang Xiong, Wei Jiang, Feng Liu, Hongfu Sun   +5 more
doaj   +1 more source

Method for Assessing the Fidelity of Optical Diffraction Tomography Reconstruction Methods

, 2019
We use a spatial light modulator in a diffraction tomographic system to assess the accuracy of different refractive index reconstruction algorithms. Optical phase conjugation principles through complex media, allows us to quantify the error for different
Ayoub, Ahmed B., Lim, Joowon, Pham, Thanh-An, Psaltis, Demetri, Unser, Michael   +4 more
core   +1 more source

Short-time homomorphic wavelet estimation

, 2013
Successful wavelet estimation is an essential step for seismic methods like impedance inversion, analysis of amplitude variations with offset and full waveform inversion.
Herrera R van der Baan M, Kaplan S T, Mirko van der Baan, Oppenheim A, Roberto Henry Herrera, Tribolet J M, VanDecar J C   +6 more
core   +1 more source

An object-based region-growing phase unwrapping method for mapping vertical displacement in permafrost landscapes

International Journal of Applied Earth Observations and Geoinformation
Terrain displacement due to the seasonal thaw of the active layer above permafrost can be sensitive to climate change; however, its accurate characterization remains a challenge.
Yongjie Xia, Baoxin Hu, Jianguo Wang, Glen Brown   +3 more
doaj   +1 more source

Descriptive Linear modeling of steady-state visual evoked response [PDF]

A study is being conducted to explore use of the steady state visual-evoke electrocortical response as an indicator of cognitive task loading. Application of linear descriptive modeling to steady state Visual Evoked Response (VER) data is summarized. Two
Junker, A. M., Kenner, K., Levison, W. H.   +2 more
core   +1 more source

Multi-Wavelength Digital-Phase-Shifting Moiré Based on Moiré Wavelength

Applied Sciences, 2019
Multi-wavelength digital-phase-shifting moiré was demonstrated using multiple moiré wavelengths determined by system calibration over the full working depth.
Fatemeh Mohammadi, Jonathan Kofman
doaj   +1 more source

Feasibility of ALOS2 PALSAR2 Offset-Based Phase Unwrapping of SAR Interferogram in Large and Complex Surface Deformations

IEEE Access, 2018
The interferometric synthetic aperture radar (InSAR) is a well-known tool for mapping ground surface deformations with centimeter precision, and is much better than that used in the offset tracking method.
Won-Kyung Baek, Hyung-Sup Jung, Sung-Ho Chae   +2 more
doaj   +1 more source

AI-Based 2D Phase Unwrapping Under Rayleigh-Distributed Speckle Noise and Phase Decorrelation

Photonics
Phase unwrapping is a critical step in interferometric imaging modalities such as holography and synthetic aperture radar, yet conventional analytical algorithms struggle in low signal-to-noise and high-speckle environments.
Aidan Soal, Juergen Meyer, Bryn Currie, Steven Marsh   +3 more
doaj   +1 more source

Real-time phasefront detector for heterodyne interferometers

, 2007
We present a real-time differential phasefront detector sensitive to better than 3 mrad rms, which corresponds to a precision of about 500 pm. This detector performs a spatially resolving measurement of the phasefront of a heterodyne interferometer, with
Cervantes, Felipe Guzmán, Danzmann, Karsten, Heinzel, Gerhard, Jennrich, Oliver, Marín, Antonio F. García, Steier, Frank, Wand, Vinzenz   +6 more
core   +1 more source

Semi-Global Matching Assisted Absolute Phase Unwrapping. [PDF]

Sensors (Basel), 2022
Liao YH, Zhang S.
europepmc   +1 more source