Results 81 to 90 of about 1,206 (204)

Large-Dynamic-Range Ocular Aberration Measurement Based on Deep Learning with a Shack–Hartmann Wavefront Sensor

Sensors
The Shack–Hartmann wavefront sensor (SHWFS) is widely utilized for ocular aberration measurement. However, large ocular aberrations caused by individual differences can easily make the spot move out of the range of the corresponding sub-aperture in SHWFS,
Haobo Zhang, Junlei Zhao, Hao Chen, Zitao Zhang, Chun Yin, Shengqian Wang   +5 more
doaj   +1 more source

A Novel Peak‐Shape Aware Approach for Mass Alignment in Mass Spectrometry

Rapid Communications in Mass Spectrometry, Volume 40, Issue 4, 28 February 2026.
ABSTRACT Rationale In mass spectrometry measurements, mass shifts may be inadvertently introduced due to instrumental drift and calibration inaccuracies, potentially compromising the accuracy of subsequent data analysis. This work presents a novel, label‐free algorithm to improve relative mass alignment between mass spectra.
Thomas Vanhemel, Melanie Nijs, Angeliki Birmpili, Tim F. E. Hendriks, Eva Cuypers, Bart De Moor   +5 more
wiley   +1 more source

The Redshift Evolution of Extended Lyα Emission in HETDEX. I. Imaging Methods and Emission Measurements

The Astrophysical Journal
We investigate extended Ly α emission using integral-field unit (IFU) data from the Hobby–Eberly Telescope Dark Energy Experiment (or HETDEX). We apply the modified Shepard method to image 106,853 Ly α emitters (LAEs) and median-stack them as functions ...
Brianna McKay, Sarah Tuttle, Erin Mentuch Cooper, Dustin Davis, Robin Ciardullo, Daniel J. Farrow, Steven L. Finkelstein, Karl Gebhardt, Chenxu Liu, Gregory Zeimann, Chris Byrohl   +10 more
doaj   +1 more source

Aberration-Conditioned Attention-Driven Centroid Localization: From Simulation Mechanism to Double-Spot Experiment

Photonics
In size, weight, and power (SWaP)-constrained optical systems, such as spaceborne LiDAR, high-precision centroid localization often relies on focal-plane measurements without dedicated wavefront sensors.
Zhonghao Zhao, Jia Hou, Yuanting Liu, Anwei Liu, Zhiping He   +4 more
doaj   +1 more source

Comparing centroiding methods for Shack-Hartmann wavefront sensing with laser guide stars on an ELT

, 2010
International audienceIn this paper we present the results of a study comparing the performance of various centroiding methods on an extended spot.
Gratadour, Damien, Meimon, Serge, Gendron, Éric, Fusco, Thierry, Rousset, Gérard   +4 more
core   +1 more source

Small bodies centroiding via image processing and convolutional neural network [PDF]

, 2020
LAUREA MAGISTRALECome l’interesse della comunità scientifica per gli small bodies cresce, così il design delle sonde cerca di adattarsi al particolare ambiente che questi impongono.
Pavoni, Marco
core  

Background Intensity Estimation for Cassini–ISS Image Using Deep-learning-based Diffusion Model

The Astronomical Journal
Accurate background intensity estimation is crucial for precise astrometric measurements in astronomical imaging, particularly in complex scenarios such as those encountered in Cassini Imaging Science Subsystem (ISS) observations of Saturn’s ring system.
Yongxin Chen, Qingfeng Zhang, Tianle Zhou, Kai Tang   +3 more
doaj   +1 more source

A Robust Geometric Distortion Solution for the Main Survey Camera of CSST

The Astronomical Journal
The advancement in sensitivity and field of view of next-generation wide-field survey telescopes requires astrometric measurements with high precision, even in the presence of significant geometric distortions.
Yibo Yan, You Wu, Jundan Nie, Tianmeng Zhang, Chao Liu, Zhang Ban, Zihuang Cao, Wei Du, Yuedong Fang, Yi Hu, Guoliang Li, Xiaobo Li, Chenxiaoji Ling, Jiaqi Lin, Dezi Liu, Yu Luo, Bin Ma, Xianmin Meng, Juanjuan Ren, Li Shao, Hao Tian, Chengliang Wei, Peng Wei, Shoulin Wei, Yun-Ao Xiao, Zhou Xie, Su Yao, Yan Yu, Shengwen Zhang, Xin Zhang, Bowei Zhao, Zhimin Zhou, Hu Zou   +32 more
doaj   +1 more source

Centroiding and Point Response Function Measurements of the Mirror/Detector Combination for the X-ray Telescope of the Swift Gamma Ray Burst Explorer

, 2020
The essential optical components of the Swft X-ray Telescope (XRT) are already developed items. They are: the flight spare x-ray mirror from the JET-X/Spectrum-X program and a MOS CCD (CCD22) of the type currently operating in orbit as part of the EPIC ...

core  

An investigation on the use of different centroiding algorithms and star catalogs in astro-geodetic observations

, 2017
In the last decade, the importance of high-precise geoid determination at local or national level has been pointed out by Turkish National Geodesy Commission. The Commission has also put objective of modernization of national height system of Turkey to
Uluğ, Raşit, Albayrak, Müge, Halıcıoğlu, Kerem, Özlüdemir, Mustafa Tevfik, Deniz, Rasim, Başoğlu, Burak   +5 more
core