Results 171 to 180 of about 2,554 (206)

Aberration laser beams with autofocusing properties

Applied Optics, 2018
We investigate theoretically, numerically, and experimentally a novel type of laser beam-an aberration laser beam (ALB). To generate the ALB, a diffractive optical element with a phase transmission function having an arbitrary radial dependence of power q and a periodic angular dependence of sin(mϕ) or cos(mϕ) form can be used.
Svetlana N, Khonina, Andrey V, Ustinov, Alexey P, Porfirev   +2 more
openaire   +2 more sources

Autofocusing and residual migration of SAR images

International Conference on Acoustics, Speech, and Signal Processing, 2002
A particular approach to the azimuth migration of synthetic aperture radar (SAR) data is discussed. It is shown that a slightly defocused SAR image can be corrected by means of a short monodimensional filter with a quadratic phase vs. time characteristic.
MONTI-GUARNIERI, ANDREA VIRGILIO, PRATI, CLAUDIO MARIA   +1 more
openaire   +2 more sources

High-speed autofocusing of multisized microobjects

2012 IEEE International Conference on Automation Science and Engineering (CASE), 2012
This paper proposes a new high-speed autofocus algorithm for observing multisized microobjects under a transmitted light microscope. The method estimates the blurriness of the object by analyzing the intensity variation of a defined region around the object border in the frequency domain. A defocus function is proposed so that the best focused position
Chanh-Nghiem Nguyen, Kenichi Ohara, Tomohito Takubo, Yasushi Mae, Tatsuo Arai   +4 more
openaire   +1 more source

Three-Airy Beams and Their Autofocusing Plane

Bulletin of the Russian Academy of Sciences: Physics
The position of the autofocusing plane of three-Airy beams is studied theoretically and experimentally depending on the shift parameter. It is shown that for different values of this parameter, the three-Airy beam may or may not have an autofocusing plane. If the beam has an autofocusing plane, then with increasing absolute value of the shift parameter,
D. V. Prokopova, E. G. Abramochkin
openaire   +1 more source

Differentiable Beamforming for Ultrasound Autofocusing

2023
Walter Simson, Louise Zhuang, Sergio J. Sanabria, Neha Antil, Jeremy J. Dahl, Dongwoon Hyun   +5 more
openaire   +1 more source

Elastic Autofocusing

Proceedings, 2014
C.A. da Costa, M. Ravasi, G. Meles, A. Curtis   +3 more
openaire   +1 more source

Single-Shot Autofocusing of Microscopy Images Using Deep Learning

ACS Photonics, 2021
Aydoğan Özcan, Yilin Luo, Yair Rivenson   +2 more
exaly  

Propagation dynamics of abruptly autofocusing circular Airyprime beam with an optical vortex

Optics and Laser Technology, 2022
Guoquan Zhou, Xiang Zang, Wensong Dan
exaly  

Millisecond autofocusing microscopy using neuromorphic event sensing

Optics and Lasers in Engineering, 2023
Edmund Y. Lam, Zhou Ge, Hayden Kwok-Hay So   +2 more
exaly  

Design and realization of an autofocusing Airyprime beams array

Optics and Laser Technology, 2023
Rui-Pin Chen, Guoquan Zhou, Xiang Zang
exaly