Results 11 to 20 of about 3,847 (222)

Defocused Image Deep Learning Designed for Wavefront Reconstruction in Tomographic Pupil Image Sensors

Mathematics, 2020
Mathematical modelling methods have several limitations when addressing complex physics whose calculations require considerable amount of time. This is the case of adaptive optics, a series of techniques used to process and improve the resolution of ...
Sergio Luis Suárez Gómez, Francisco García Riesgo, Carlos González Gutiérrez, Luis Fernando Rodríguez Ramos, Jesús Daniel Santos   +4 more
doaj   +1 more source

A Local Threshold Checkerboard Algorithm for Adaptive Optics System With a Plenoptic Sensor

IEEE Photonics Journal, 2022
Adaptive optics systems will encounter challenges under strong atmospheric turbulence conditions. Recently, a modified approach based on plenoptic sensor has attracted considerable attention.
Zhichong Wang, Tao Chen, Xudong Lin, Liang Wang, Qichang An, Jintian Hu   +5 more
doaj   +1 more source

Shack–Hartmann Wavefront Sensing Based on Four-Quadrant Binary Phase Modulation

Photonics, 2022
Aiming at the problem that it is difficult for the conventional Shack–Hartmann wavefront sensor to achieve high-precision wavefront reconstruction with low spatial sampling, a kind of Shack–Hartmann wavefront sensing technology based on four-quadrant ...
Mengmeng Zhao, Wang Zhao, Kangjian Yang, Shuai Wang, Ping Yang, Fengjiao Zeng, Lingxi Kong, Chao Yang   +7 more
doaj   +1 more source

Surface Measurement Using Compressed Wavefront Sensing

Photonic Sensors, 2018
Compressed sensing leverages the sparsity of signals to reduce the amount of measurements required for its reconstruction. The Shack-Hartmann wavefront sensor meanwhile is a flexible sensor where its sensitivity and dynamic range can be adjusted based on
Eddy Mun Tik Chow, Ningqun Guo, Edwin Chong, Xin Wang   +3 more
doaj   +1 more source

COMPARISON OF HOLOGRAPHIC AND ITERATIVE METHODS FOR AMPLITUDE OBJECT RECONSTRUCTION [PDF]

Научно-технический вестник информационных технологий, механики и оптики, 2015
Experimental comparison of four methods for the wavefront reconstruction is presented. We considered two iterative and two holographic methods with different mathematical models and algorithms for recovery.
I. A. Shevkunov, N. V. Petrov
doaj   +1 more source

Study on Aberration Correction of Adaptive Optics Based on Convolutional Neural Network

Photonics, 2021
The existence of aberrations has always been an important limiting factor in the imaging field. Especially in optical microscopy imaging, the accumulated aberration of the optical system and the biological samples distorts the wavefront on the focal ...
Jin Li, Luwei Wang, Yong Guo, Yangrui Huang, Zhigang Yang, Wei Yan, Junle Qu   +6 more
doaj   +1 more source

Impact of CMOS Pixel and Electronic Circuitry in the Performance of a Hartmann-Shack Wavefront Sensor

Sensors, 2018
This work presents a numerical simulation of a Hartmann-Shack wavefront sensor (WFS) that assesses the impact of integrated electronic circuitry on the sensor performance, by evaluating a full detection chain encompassing wavefront sampling ...
Úrsula Vasconcelos Abecassis, Davies William de Lima Monteiro, Luciana Pedrosa Salles, Carlos Augusto de Moraes Cruz, Pablo Nunes Agra Belmonte   +4 more
doaj   +1 more source

Wavefront reconstruction by modal decomposition

Optics Express, 2012
We propose a new method to determine the wavefront of a laser beam based on modal decomposition by computer-generated holograms. The hologram is encoded with a transmission function suitable for measuring the amplitudes and phases of the modes in real-time. This yields the complete information about the optical field, from which the Poynting vector and
Christian, Schulze, Darryl, Naidoo, Daniel, Flamm, Oliver A, Schmidt, Andrew, Forbes, Michael, Duparré   +5 more
openaire   +2 more sources

An accelerated framework for high-resolution X-ray holographic reconstruction. [PDF]

J Synchrotron Radiat
HiHolo, a high‐performance CUDA‐MPI software framework for X‐ray holographic reconstruction, achieves performance improvement over existing solutions while introducing three enhanced iterative algorithms that effectively reduce artifacts and improve spatial resolution in propagation‐based phase contrast imaging.X‐ray propagation‐based phase contrast ...
Hu J, Ji B, Hu Y, Wang L, Chang G, Shi J.   +5 more
europepmc   +2 more sources

Optical Wavefront Reconstruction: Theory and Numerical Methods [PDF]

SIAM Review, 2002
Summary: Optical wavefront reconstruction algorithms played a central role in the effort to identify gross manufacturing errors in NASA's Hubble Space Telescope (HST). NASA's success with reconstruction algorithms on the HST has led to an effort to develop software that can aid and in some cases replace complicated, expensive, and error-prone hardware.
Luke, D. Russell, Burke, James V., Lyon, Richard G.   +2 more
openaire   +3 more sources