Results 71 to 80 of about 148,419 (252)

A Short Survey on Arithmetic Transforms and the Arithmetic Hartley Transform [PDF]

Revista da Sociedade Brasileira de Telecomunica\c{c}\~{o}es (Journal of Communication and Information Systems), v. 19, pp. 68--79, 2004, 2015
Arithmetic complexity has a main role in the performance of algorithms for spectrum evaluation. Arithmetic transform theory offers a method for computing trigonometrical transforms with minimal number of multiplications. In this paper, the proposed algorithms for the arithmetic Fourier transform are surveyed.
arxiv   +1 more source

Walsh - Hadamard Transformation of a Convolution

Radioengineering, 2002
A convolution is mathematical operation used in signal processing,in the homomorphous signal processing and digital image processing(e.g. image interpolation). In regard of computational complexity ofthe convolution in the time domain, it used to calculate in the otherdomain. Exp. x(n) * h(n) R X(W) × H(W), resp.
Usakova, A., Kotuliakova, J., Zajac, M.
openaire   +2 more sources

An efficient quantum algorithm for ensemble classification using bagging

IET Quantum Communication, Volume 5, Issue 3, Page 253-268, September 2024.
A new quantum algorithm that exploits quantum superposition, entanglement, and interference to build an ensemble of classification models is introduced. Thanks to the generation of several quantum trajectories in superposition, the authors obtain an exponentially large number of base models increasing only linearly the depth of the correspondent ...
Antonio Macaluso, Luca Clissa, Stefano Lodi, Claudio Sartori   +3 more
wiley   +1 more source

Gaze Estimation using Transformer [PDF]

arXiv, 2021
Recent work has proven the effectiveness of transformers in many computer vision tasks. However, the performance of transformers in gaze estimation is still unexplored. In this paper, we employ transformers and assess their effectiveness for gaze estimation. We consider two forms of vision transformer which are pure transformers and hybrid transformers.
arxiv  

Advances in Quantum Imaging with Machine Intelligence

Laser &Photonics Reviews, Volume 18, Issue 8, August 2024.
Quantum imaging exemplifies the fascinating and counter‐intuitive nature of the quantum world, where non‐local correlations are exploited for the imaging of objects by remote and non‐interacting photons. The field has exploded of late, driven by advances in the fundamental understanding of these processes, but also by advances in technology.
Chané Moodley, Andrew Forbes
wiley   +1 more source

Recommendations for quantitative cerebral perfusion MRI using multi‐timepoint arterial spin labeling: Acquisition, quantification, and clinical applications

Magnetic Resonance in Medicine, Volume 92, Issue 2, Page 469-495, August 2024.
Abstract Accurate assessment of cerebral perfusion is vital for understanding the hemodynamic processes involved in various neurological disorders and guiding clinical decision‐making. This guidelines article provides a comprehensive overview of quantitative perfusion imaging of the brain using multi‐timepoint arterial spin labeling (ASL), along with ...
Joseph G. Woods, Eric Achten, Iris Asllani, Divya S. Bolar, Weiying Dai, John A. Detre, Audrey P. Fan, María A. Fernández‐Seara, Xavier Golay, Matthias Günther, Jia Guo, Luis Hernandez‐Garcia, Mai‐Lan Ho, Meher R. Juttukonda, Hanzhang Lu, Bradley J. MacIntosh, Ananth J. Madhuranthakam, Henk‐Jan Mutsaerts, Thomas W. Okell, Laura M. Parkes, Nandor Pinter, Joana Pinto, Qin Qin, Marion Smits, Yuriko Suzuki, David L. Thomas, Matthias J. P. Van Osch, Danny J. J. Wang, Esther A. H. Warnert, Greg Zaharchuk, Fernando Zelaya, Moss Zhao, Michael A. Chappell, the ISMRM Perfusion Study Group   +33 more
wiley   +1 more source

Matrix Factorization and Some Fast Discrete Transforms

Axioms
In this paper, three discrete transforms related to vector spaces over finite fields are studied. For our purposes, and according to the properties of the finite fields, the most suitable transforms are as follows: for binary fields, this is the Walsh ...
Iliya Bouyukliev, Mariya Dzhumalieva-Stoeva, Paskal Piperkov   +2 more
doaj   +1 more source

Brain Tumor Segmentation Based on α‐Expansion Graph Cut

International Journal of Imaging Systems and Technology, Volume 34, Issue 4, July 2024.
ABSTRACT In recent years, there has been an increased interest in using image processing, computer vision, and machine learning in biological and medical imaging research. One area of this interest is the diagnosis of brain tumors, which is considered a difficult and time‐consuming task traditionally performed manually.
Roaa Soloh, Hassan Alabboud, Ahmad Shahin, Adnan Yassine, Abdallah El Chakik   +4 more
wiley   +1 more source

The Xi-transform for conformally flat space-time [PDF]

arXiv, 2006
The Xi-transform is a new spinor transform arising naturally in Einstein's general relativity. Here the example of conformally flat space-time is discussed in detail. In particular it is shown that for this case, the transform coincides with two other naturally defined transforms: one a two-variable transform on the Lie group SU(2, C), the other a ...
arxiv  

A composite spread spectrum sequence for underwater acoustic signal acquisition

IET Communications, Volume 18, Issue 11, Page 689-700, July 2024.
This article explores the acquisition performance of spectrum spread sequence based on underwater acoustic (UWA) channel. To overcome the limitations of conventional sequences, a composite chaotic orthogonal sequence (CCOS) is proposed as spectrum spread sequence and a source‐target model is constructed for simulation. In addition, a parallel algorithm
Chenyu Zhang, Huabing Wu
wiley   +1 more source