Results 31 to 40 of about 1,379 (173)

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, Yan Kong, Fei Liu, Cheng Liu, Shouyu Wang   +4 more
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, Eugeny G. Abramochkin, Alexey A. Kovalev, Alexandra A. Savelyeva   +3 more
doaj   +1 more source

Investigation of an Autofocusing Method for Visible Aerial Cameras Based on Image Processing Techniques

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

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, Juntao Hu, Yishu Wang, Wenni Ye, Yixian Qian   +4 more
doaj   +1 more source

Direction of Arrival Estimation and Highlighting Characteristics of Testing Wideband Echoes from Multiple Autonomous Underwater Vehicles

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, Peizhen Zhang, Guangbo Zhou, Ziyi Feng   +3 more
doaj   +1 more source

An optimum design of a ring Airyprime beam array based on dimensionless eccentric position

Results in Physics
The beam array with abruptly autofocusing capability weakens the turbulence effect in free space optical (FSO) communication systems with relatively low complexity, thereby improving the communication quality of FSO communication systems.
Yi-Min Zhou, Jian He, Wen-Song Dan, Fei Wang, Guo-Quan Zhou   +4 more
doaj   +1 more source

Multi-Incidence Holographic Profilometry for Large Gradient Surfaces with Sub-Micron Focusing Accuracy

Sensors, 2021
Surface reconstruction for micro-samples with large discontinuities using digital holography is a challenge. To overcome this problem, multi-incidence digital holographic profilometry (MIDHP) has been proposed. MIDHP relies on the numerical generation of
Moncy Sajeev Idicula, Tomasz Kozacki, Michal Józwik, Patryk Mitura, Juan Martinez-Carranza, Hyon-Gon Choo   +5 more
doaj   +1 more source

Lightweight smart autofocusing eyeglasses

MOEMS and Miniaturized Systems XVII, 2018
More than 100 million people in the United States of America alone suffer from age-related presbyopia caused by a loss of focal accommodation of the eye crystalline lens as the lens stiffens with age. The resulting accommodative error or lag produces blurred images of objects placed at different distances.
N, Hasan, M, Karkhanis, C, Ghosh, F, Khan, T, Ghosh, H, Kim, C H, Mastrangelo   +6 more
openaire   +3 more sources

Enhanced Rapid Autofocus Back-Projection for PBSAR Based on the GEO Satellite

Remote Sensing
The passive bistatic synthetic aperture radar (PBSAR) is recognized as a critical developmental direction for future radar systems. To validate its operational feasibility, we designed a PBSAR system. However, significant measurement errors were observed
Te Zhao, Jun Wang, Zuhan Cheng, Ziqian Huang, Jiaqi Song   +4 more
doaj   +1 more source

Logarithmic Laplacian Prior Based Bayesian Inverse Synthetic Aperture Radar Imaging

Sensors, 2016
This paper presents a novel Inverse Synthetic Aperture Radar Imaging (ISAR) algorithm based on a new sparse prior, known as the logarithmic Laplacian prior.
Shuanghui Zhang, Yongxiang Liu, Xiang Li, Guoan Bi   +3 more
doaj   +1 more source