Results 31 to 40 of about 4,294 (185)
Autofocusing Algorithm for Pixel-Super-Resolved Lensfree On-Chip Microscopy
Frontiers in Physics, 2021 In recent years, lensfree on-chip microscopy has developed into a promising and powerful computational optical microscopy technique that allows for wide-field, high-throughput microscopic imaging without using any lenses.
Yumin Wu +19 more
doaj +1 more source
Graphics processing unit (GPU) aided wavefront-based autofocusing in microscopy
AIP Advances, 2018 Based on the wavefront sensing and propagation, the wavefront-based autofocus approach is proposed for potentially adopted in rapid autofocusing since it can precisely locate the focal plane but only requiring much fewer multi-focal image captures ...
Zhilong Jiang +4 more
doaj +1 more source
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
A New Autofocusing Method Based on Brightness and Contrast for Color Cameras
Advances in Electrical and Computer Engineering, 2016 The autofocusing is one of the most important features of imaging devices. This feature directly affects the quality of the image taken by the imaging device. Currently, many studies are being performed to improve the feature of autofocusing.
SELEK, M.
doaj +1 more source
Laguerre-Gaussian Beams with an Increased Dark Area and Autofocusing
Photonics, 2022 We introduce and investigate a novel Laguerre-Gaussian (LG) beam, different from the conventional modal LG beams, which conserve the transverse intensity structure (up to scale) on propagation.
Victor V. Kotlyar +3 more
doaj +1 more source
Band-specific phase engineering for curving and focusing light in waveguide arrays [PDF]
, 2012 Band specific design of curved light caustics and focusing in optical waveguide arrays is introduced. Going beyond the discrete, tight-binding model, which we examined recently, we show how the exact band structure and the associated diffraction ...
Chremmos, Ioannis +1 more
core +1 more source
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
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
A sparsity-driven approach for joint SAR imaging and phase error correction [PDF]
, 2012 Image formation algorithms in a variety of applications have explicit or implicit dependence on a mathematical model of the observation process. Inaccuracies in the observation model may cause various degradations and artifacts in the reconstructed ...
Çetin, Müjdat, Önhon, Özben Naime
core +5 more sources
Abruptly autofocusing vortex beams
Optics Express, 2012 We generate abruptly autofocusing beams that produce vortices at the focus. We give explicit equations for the phase-only Fourier masks that generate these beams including explanations for controlling the focal distance and numerical aperture. We show experimental results for the focal distance, the vortex pattern and show that the diameter of the ...
Don M. Cottrell +2 more
openaire +4 more sources