Results 31 to 40 of about 145,669 (318)

The Extreme Learning Machine for the Extraction of Mono-Exponential Decay Time

IEEE Photonics Journal, 2023
The mono-exponential decay has been used to describe various physical phenomena such as cavity ring-down signal, fluorescence decay, etc. In this paper, a neural network method of extreme learning machine (ELM) is adopted to efficiently extract decay ...
Xing He, Zhongzhou Tian, Haiqi Lin, Shuai Wang, Ping Yang   +4 more
doaj   +1 more source

Real-time turbulence profiling with a pair of laser guide star Shack–Hartmann wavefront sensors for wide-field adaptive optics systems on large to extremely large telescopes [PDF]

, 2010
Real-time turbulence profiling is necessary to tune tomographic wavefront reconstruction algorithms for wide-field adaptive optics (AO) systems on large to extremely large telescopes, and to perform a variety of image post-processing tasks involving ...
Ellerbroek, B. L., Gilles, L.
core   +1 more source

Adaptive Optics

Acta Ophthalmologica, 2015
SummaryDuring dry age‐related macular degeneration (ARMD), adaptive optics (AO) en face flood imaging improves the resolution of drusens and of pigmentary changes and hence of the progression of atrophic lesions. In addition, AO revealed the presence of numerous migrating hyporeflective clumps, which are most likely melanin‐loaded cells (MLCs).
Bernhard R. Brandl, Ramón Navarro, Christoph U. Keller   +2 more
  +6 more sources

Cross-Correlation Algorithm Based on Speeded-Up Robust Features Parallel Acceleration for Shack–Hartmann Wavefront Sensing

Photonics
A cross-correlation algorithm to obtain the sub-aperture shifts that occur is a crucial aspect of scene-based SHWS (Shack–Hartmann wavefront sensing).
Linxiong Wen, Xiaohan Mei, Yi Tan, Zhiyun Zhang, Fangfang Chai, Jiayao Wu, Shuai Wang, Ping Yang   +7 more
doaj   +1 more source

High-resolution visible imaging with piezoelectric deformable secondary mirror: experimental results at the 1.8-m adaptive telescope

Opto-Electronic Advances, 2023
Integrating deformable mirrors within the optical train of an adaptive telescope was one of the major innovations in astronomical observation technology, distinguished by its high optical throughput, reduced optical surfaces, and the incorporation of the
Youming Guo, Kele Chen, Jiahui Zhou, Zhengdai Li, Wenyu Han, Xuejun Rao, Hua Bao, Jinsheng Yang, Xinlong Fan, Changhui Rao   +9 more
doaj   +1 more source

RMVAD-YOLO: A Robust Multi-View Aircraft Detection Model for Imbalanced and Similar Classes

Remote Sensing
Aircraft detection technology plays a vital role in civilian applications, with significant attention being devoted to research on related algorithms in recent years.
Keda Li, Xiangyue Zheng, Jingxin Bi, Gang Zhang, Yi Cui, Tao Lei   +5 more
doaj   +1 more source

Fast Restoration of Aberration-Degraded Extended Object Based on Local Region Abstraction

IEEE Photonics Journal, 2018
The compensating capability of wavefront sensorless adaptive optics (WFSless AO) system for extended object images degraded by aberration is severely limited to correction speed due to largely sized images and low frame rate of camera.
Lianghua Wen, Ping Yang, Shuai Wang, Shanqui Chen, Wenjing LIU, Wei Bai, Zhiqiang Xu, Feilong Wang, Bing Xu   +8 more
doaj   +1 more source

Extragalactic Fields Optimized for Adaptive Optics

, 2011
In this paper we present the coordinates of 67 55' x 55' patches of sky which have the rare combination of both high stellar surface density (>0.5 arcmin^{-2} with ...
Bonaccini D., David Monet, Davies R., Francois Rigaut, Henry Joy McCracken, Ivana Damjanov, Jarle Brinchmann, Jean-Charles Cuillandre, Karl Glazebrook, Patrick Hudelot, Patrick J. McCarthy, Peter McGregor, Rigaut F., Roberto G. Abraham, Roggemann M. C., Rousset G., Wang L., Yannick Mellier   +17 more
core   +1 more source

Astronomical adaptive optics: a review

PhotoniX
Since the concept of adaptive optics(AO) was proposed in 1953, AO has become an indispensable technology for large aperture ground-based optical telescopes aimed at high resolution observations.
Changhui Rao, Libo Zhong, Youming Guo, Min Li, Lanqiang Zhang, Kai Wei   +5 more
doaj   +1 more source

Multi-Aperture Adaptive Fiber-Coupled Free-Space Optical Communication System: Scintillation Mitigation and Turbulence Compensation Experiment Based on Gamma-Gamma Channel Modeling

IEEE Photonics Journal
Free-space optical communication is an effective alternative solution to address the “last mile” bottleneck in fiber-optic communication systems.
Ziting Pan, Yuting Li, Yijie Shen, Ziqiang Li, Guan Huang, Chao Geng, Xinyang Li   +6 more
doaj   +1 more source