Results 31 to 40 of about 33,132 (307)

FPGA-accelerated adaptive optics wavefront control

, 2022
Paper 897802The speed of real-time adaptive optical systems is primarily restricted by the data processing hardware and computational aspects. Furthermore, the application of mirror layouts with increasing numbers of actuators reduces the bandwidth ...
Reger, Johann, Mauch, Steffen, Goy, Matthias, Appelfelder, Michael, Tünnermann, Andreas, Reinlein, Claudia, Beckert, Erik   +6 more
core   +1 more source

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

Centroid-Predicted Deep Neural Network in Shack-Hartmann Sensors

IEEE Photonics Journal, 2022
The Shack-Hartmann wavefront sensor produces incorrect wavefront measurements when some sub-spots are weak and missing. In this paper, a method is proposed to predict the centroids of these sub-spots for the Shack-Hartmann wavefront sensor based on the ...
Mengmeng Zhao, Wang Zhao, Shuai Wang, Ping Yang, Kangjian Yang, Haiqi Lin, Lingxi Kong   +6 more
doaj   +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

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

The Role of Hematopoietic Cell Transplantation in Ataxia‐Telangiectasia

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Ataxia‐telangiectasia (A‐T) is a DNA repair disorder characterized by neurodegeneration, immunodeficiency, and cancer predisposition. Hematopoietic cell transplantation (HCT) is an established therapy in related disorders such as Fanconi anemia (FA) and Nijmegen breakage syndrome (NBS), but its role in A‐T is unclear.
Laila Alkhouli, Seth Rotz, Masatoshi Takagi, Richa Sharma   +3 more
wiley   +1 more source

Image sharpening metrics and search strategies for indirect adaptive optics [PDF]

, 2000
Adaptive optics is concerned with the correction of turbulence induced aberrations and mis-alignments in optical systems. It is an expensive and complicated technology which has been developed for astronomy and defence applications.
Doble, N., Doble, Nathan
core  

Solar adaptive optics system using electromagnetic deformable mirror [PDF]

, 2009
A solar adaptive optics system has been improved by using a high-speed electromagnetic deformable mirror and adopting a modified sum-of-absolute-differences algorithm in wavefront sensing.
Noto, Yuuki, Miura, Noriaki, Baba, Naoshi, Hanaoka, Yoichiro, Ichimoto, Kiyoshi, Kato, Shuusuke, Kuwamura, Susumu, Ueno, Satoru, Takami, Hideki, Yokoyama, Fumihito, Nagata, Shin’ichi, Kitai, Reizaburou   +11 more
core   +1 more source

Preliminary diagnosis of eye health via wavefront parameters based on statistical frequency distributions

European Journal of Medical Research
Background Eye disease is a global health issue, and current diagnostic methods are complex, costly and more suitable for final diagnosis. In order to detect abnormal eyes earlier, it is necessary to develop a simple and low-cost method for preliminary ...
Yaliang Yang, Shen Chen, Xian Yue, Hao Chen, Fan Yang, Qixiang Huang   +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