Results 41 to 50 of about 5,613 (231)
zPIE: an autofocusing algorithm for ptychography [PDF]
Optics Letters, 2020 An autofocusing algorithm for ptychography is proposed. The method optimizes a sharpness metric that would be observed in a differential interference microscope and is valid for both amplitude and phase modulating specimens. We experimentally demonstrate that the algorithm, based on the extended ptychographic iterative engine (ePIE), calibrates the ...
Loetgering, Lars +3 more
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Autofocus for digital Fresnel holograms by use of a Fresnelet-sparsity criterion [PDF]
, 2004 We propose a robust autofocus method for reconstructing digital Fresnel holograms. The numerical reconstruction involves simulating the propagation of a complex wave front to the appropriate distance.
Liebling, Michael, Unser, Michael
core +2 more sources
International Journal of Aerospace Engineering, 2016 In order to realize the autofocusing in aerial camera, an autofocusing system is established and its characteristics such as working principle and optical-mechanical structure and focus evaluation function are investigated.
Zhichao Chen, Tao Zhang
doaj +1 more source
Correcting Presbyopia With Autofocusing Liquid-Lens Eyeglasses [PDF]
IEEE Transactions on Biomedical Engineering, 2022 12 pages, 13 ...
Mohit U. Karkhanis +7 more
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A Workstation for microassembly [PDF]
, 2007 In this paper, an open-architecture, reconfigurable microassembly workstation for efficient and reliable assembly of micromachined parts is presented.
Kunt, Emrah Deniz +2 more
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Manipulating self-focusing beams induced by high-dimensional parabolic umbilic beams
Results in Physics, 2023 The excellent property that the intensity of autofocusing beams in the focal plane increases exponentially, makes them especially beneficial for biomedical treatment.
Zhuo Sun +4 more
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Simulation of Laser Propagation in a Plasma with a Frequency Wave Equation [PDF]
, 2007 The aim of this work is to perform numerical simulations of the propagation of a laser in a plasma. At each time step, one has to solve a Helmholtz equation in a domain which consists in some hundreds of millions of cells.
Ballereau +24 more
core +4 more sources
Sensors, 2023 Multiple autonomous underwater vehicles (AUVs) have gradually become the trend in underwater operations. Identifying and detecting these new underwater multi-targets is difficult when studying underwater moving targets. A 28-element transducer is used to
Xiaofeng Yin +3 more
doaj +1 more source
Focusing property of autofocusing Bessel beams
Optics Express, 2023 We introduce what we believe to be a new family of abruptly autofocusing waves named autofocusing Bessel beams (ABBs). Since the beams only strongly influence the area near the focus, it holds promise for medical laser treatment and optical tweezers. By the angular spectrum method, ABBs are proved to be a class solution for the Helmholtz equation.
Zhoulin Ding +4 more
openaire +2 more sources
Linear and nonlinear waves in surface and wedge index potentials [PDF]
, 2012 We study optical beams that are supported at the surface of a medium with a linear index potential and by a piecewise linear wedge type potential. In the linear limit the modes are described by Airy functions.
Efremidis, Nikolaos K. +2 more
core +1 more source