Results 61 to 70 of about 1,511 (175)

Performance Analysis of the LDPC‐Coded Hybrid LQAM‐MPPM for UWOC Systems

IET Optoelectronics, Volume 20, Issue 1, January/December 2026.
The effectiveness of LDPC codes in improving the performance of hybrid modulations is discussed, with coded 128‐QAM‐(12, 2) MPPM offering ~6.5 and 5.8 dB code gains at a BER of in strong and moderate turbulence, respectively. These results demonstrate the promise of hybrid modulation with LDPC as a robust and efficient modulation scheme for UWOC ...
Hongyan Jiang, Wanyi Hu, Xin Liao, Ning He, Wasiu Popoola, Ahmad Fairuz Omar, Sujan Rajbhandari   +6 more
wiley   +1 more source

Textual Feature Extraction and Machine Learning Classification for Document Forgery Detection

Applied Computational Intelligence and Soft Computing, Volume 2026, Issue 1, 2026.
The authentication of scanned administrative documents is a critical challenge in digital forensics due to the accessibility of sophisticated image editing tools. While existing forgery detection methods focus on geometric patterns or hardware signatures, they often struggle with the structural complexity of Arabic cursive script or require original ...
Hiba Benhamza, Abdelhamid Djeffal, Abbas Cheddad, Pramita Mishra   +3 more
wiley   +1 more source

Three‐Year Visual Quality Evaluation in Children Using Orthokeratology Lenses: A Retrospective Study With OPD‐Scan III Measurements

Journal of Ophthalmology, Volume 2026, Issue 1, 2026.
Purpose To evaluate long‐term visual quality outcomes, refractive changes, and safety during orthokeratology lens wear in children with myopia over a 3‐year period. Methods We conducted a retrospective analysis of 130 myopic children aged 8–18 years who wore corneal refractive therapy (CRT) lenses from February 2021 to November 2024.
Shang Li, Yihan Guo, Lei Tian, Qianru Wu, Ao Li, Ying Jie, Antonio Queiros   +6 more
wiley   +1 more source

Effect of Corneal Incision Features on Corneal Endothelial Cell, Astigmatism, and Higher‐Order Aberrations After Implantable Collamer Lens Implantation

Journal of Ophthalmology, Volume 2026, Issue 1, 2026.
Purpose This study evaluated the impact of clear corneal incision (CCI) morphology on corneal endothelial cell density (ECD), astigmatism, and higher‐order aberrations (HOAs) following implantable collamer lens (ICL) implantation. Design Prospective study. Methods Sixty‐five patients (65 eyes) undergoing ICL implantation were included.
I-Chun Lin, Mingrui Cheng, Mingwei Li, Yinjie Jiang, Guanghan Xu, Yadi Lei, Zhiwei Mao, Rui Ning, Xun Chen, Xiaoying Wang, Shweta Negi   +10 more
wiley   +1 more source

Effects of customized corneal cross‐linking on higher‐order aberrations in progressive keratoconus and low‐grade myopia

Acta Ophthalmologica, Volume 103, Issue 8, Page 966-973, December 2025.
Abstract Objective To evaluate the effects of customized corneal collagen cross‐linking (CXL) on higher‐order aberrations (HOAs) in keratoconus (KC): vertical coma (VC), horizontal coma (HC), spherical aberration (SA), trefoil (TF) and astigmatism, compared with the same effects in healthy eyes undergoing CXL for low‐grade myopia.
Jad Hayek, Andreas Viberg, Sofie Elving, Anneli Fredriksson, Anders Behndig   +4 more
wiley   +1 more source

Zernike phase spatial filter for measuring the aberrations of the optical structures of the eye

Journal of Biomedical Photonics & Engineering, 2015
To measure directly the wavefront aberration coefficients, we propose to use the multi-order diffractive element fitted with the set of Zernike polynomials. Polynomials of lowest degree describe defocusing (ametropy) and astigmatism.
Svetlana N. Khonina, Victor V. Kotlyar, Dmitriy V. Kirsh   +2 more
doaj   +1 more source

PSF Estimation of Space-Variant Ultra-Wide Field of View Imaging Systems

Applied Sciences, 2017
Ultra-wide-field of view (UWFOV) imaging systems are affected by various aberrations, most of which are highly angle-dependent. A description of UWFOV imaging systems, such as microscopy optics, security camera systems and other special space-variant ...
Petr Janout, Petr Páta, Petr Skala, Jan Bednář   +3 more
doaj   +1 more source

A new operational matrix method to solve nonlinear fractional differential equations

Nonlinear Engineering
This study aims to propose novel Zernike wavelets and a new method based on the operational matrices for solving nonlinear fractional differential equations. First, non-orthogonal Zernike wavelets are introduced using the Zernike polynomials. Then, a new
Hedayati Maryamsadat, Ezzati Reza
doaj   +1 more source

Quantifying the morphology of eyeballs with posterior staphyloma with Zernike polynomials. [PDF]

Front Bioeng Biotechnol, 2023
Rong H, Liu L, Liu Y, Fu W, Xu H, Yu D, Wu D, Du B, Zhang X, Zhang B, Wei R.   +10 more
europepmc   +1 more source

ENZ-Based High Fidelity Complex-Field Reconstruction

IEEE Photonics Journal
The Extended Nijboer-Zernike (ENZ) theory, an analytical solution based on Zernike polynomials within Fourier integration, offers unique advantages in characterizing imaging spaces.
Wencan Wei, Fuda Jiang, Chonglei Zhang
doaj   +1 more source