Contrast enhancement for the infrared vein image of leg based on the optical angular spectrum theory
Sign Up to like & getrecommendations! Published in 2017 at "Signal, Image and Video Processing"
DOI: 10.1007/s11760-016-0977-3
Abstract: The near-infrared (NIR) imaging method was required for the diagnosis of varicose veins, which mean that the veins have become enlarged and twisted on leg. In some cases, the hair on leg could be dense… read more here.
Keywords: image; spectrum theory; angular spectrum; leg ... See more keywords
Modified scaling angular spectrum method for numerical simulation in long-distance propagation
Sign Up to like & getrecommendations! Published in 2020 at "Chinese Physics B"
DOI: 10.1088/1674-1056/abd38d
Abstract: The angular method (AS) cannot be used in long-distance propagation because it produces severe numerical errors due to the sampling problem in the transfer function. Two ways can solve this problem in AS for long-distance… read more here.
Keywords: propagation; calculation; angular spectrum; distance propagation ... See more keywords
A Generalized Split-Step Angular Spectrum Method for Efficient Simulation of Wave Propagation in Heterogeneous Media
Sign Up to like & getrecommendations! Published in 2021 at "IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control"
DOI: 10.1109/tuffc.2021.3075367
Abstract: Angular spectrum (AS) methods enable efficient calculation of wave propagation from one plane to another inside homogeneous media. For wave propagation in heterogeneous media such as biological tissues, AS methods cannot be applied directly. Split-stepping… read more here.
Keywords: propagation; method; wave propagation; heterogeneous media ... See more keywords
Passive acoustic mapping in aberrating media with the angular spectrum approach
Sign Up to like & getrecommendations! Published in 2017 at "Journal of the Acoustical Society of America"
DOI: 10.1121/1.4987175
Abstract: The ability to localize and characterize ultrasound-induced microbubble oscillations through the intact skull with high spatial and temporal resolution holds significant promise for the diagnosis and treatment of brain diseases and disorders. In this study,… read more here.
Keywords: acoustic mapping; mapping aberrating; angular spectrum; approach ... See more keywords
Simulation of multimode optical fibers using the angular spectrum algorithm and a Fourier analysis.
Sign Up to like & getrecommendations! Published in 2019 at "Applied optics"
DOI: 10.1364/ao.58.004585
Abstract: Multimode optical fibers are gaining increased interest for higher data rate transmissions. In this work, we examine the propagation of beams in multimode optical fibers using the angular spectrum method for several values for the… read more here.
Keywords: optical fibers; using angular; fibers using; angular spectrum ... See more keywords
Shifted band-extended angular spectrum method for off-axis diffraction calculation.
Sign Up to like & getrecommendations! Published in 2021 at "Optics express"
DOI: 10.1364/oe.419096
Abstract: The shifted band-extended angular spectrum method (Shift-BEASM) is proposed to calculate free-space diffraction between two parallel planes with an off-axis offset. Off-axis numerical propagation is useful for simulating non-paraxial and large-scale fields. The proposed Shift-BEASM… read more here.
Keywords: angular spectrum; method; shifted band; spectrum method ... See more keywords
Fast numerical propagation in high-NA imaging using the resampling angular spectrum method.
Sign Up to like & getrecommendations! Published in 2022 at "Optics express"
DOI: 10.1364/oe.470800
Abstract: Numerical propagation calculation is a fundamental research topic in optical engineering. The standard angular spectrum method (ASM) is accurate but time- and memory-consuming, especially for high-NA systems. In this work, we propose a fast and… read more here.
Keywords: spectrum method; spectrum; numerical propagation; angular spectrum ... See more keywords
Non-uniform angular spectrum method in a complex medium based on iteration.
Sign Up to like & getrecommendations! Published in 2022 at "Optics letters"
DOI: 10.1364/ol.454171
Abstract: The traditional angular spectrum method has an inherent problem that the region of diffraction propagation should be homogeneous. However, in some cases, the medium of the diffraction propagation region is inhomogeneous. In this Letter, based… read more here.
Keywords: spectrum method; complex medium; method; diffraction ... See more keywords
Signal of an autocorrelation low-coherence interferometer probing a layered object by a wave-field with wide angular spectrum
Sign Up to like & getrecommendations! Published in 2021 at "Computer Optics"
DOI: 10.18287/2412-6179-co-821
Abstract: The effect of the width of the angular spectrum (numerical aperture) of a broadband-frequency wave-field probing a layered object on the signal of an autocorrelation low-coherence interferometer (ALCI) under spatially coherent and incoherent illumination of… read more here.
Keywords: field; interferometer; angular spectrum; wave field ... See more keywords