Results 221 to 230 of about 3,457,264 (301)

Analysis and comparison of discrete fractional fourier transforms

Signal Processing, 2019
The fractional Fourier transform (FRFT) is a powerful tool for time-varying signal analysis. There exist various discrete fractional Fourier transforms (DFRFTs); in this paper, we systematically analyze and compare the main DFRFT types: sampling-type ...
Xinhua Su, R. Tao, Xuejing Kang
semanticscholar   +1 more source

Difference operators and generalized discrete fractional transforms in signal and image processing

Signal Processing, 2018
The fractional Fourier transform (FrFT) is a major tool in signal and image processing. Since its computation for analog signals includes the evaluation of improper integrals involving e − x 2 , x ∈ R , several methods have been proposed to approximate ...
M. Annaby, H. Ayad, M. Rushdi, E. Nehary
semanticscholar   +1 more source

Discrete Equations, Discrete Transformations, and Discrete Boundary Value Problems

Differential Equations, 2023
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Afanas'eva, E. B., Vasil'ev, V. B., Kamanda Bongay, A. B.   +2 more
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Discrete Bargmann transform

Journal of the Optical Society of America A, 2019
We define a discrete Bargmann transform for discrete and finite functions by means of the coherent states in the su(2) finite harmonic oscillator model. The transform space is over a corresponding finite square mesh in the complex plane. From there, the inverse discrete Bargmann transform reconstitutes the original function with an average error of 10 ...
openaire   +2 more sources

Quasi-discrete Hankel transform

Optics Letters, 1998
A quasi-discrete Hankel transform (QDHT) is presented as a new and efficient framework for numerical evaluation of the zero-order Hankel transform. A discrete form of Parseval's theorem is obtained for the first time to the authors' knowledge, and the transform matrix is discussed.
Yu, L., Huang, M. C., Chen, M. Z., Chen, W. Z., Huang, W. D., Zhu, Z. Z.   +5 more
openaire   +3 more sources

Discrete Lattice Wavelet Transform

IEEE Transactions on Circuits and Systems II: Express Briefs, 2007
The discrete wavelet transform (DWT) has gained a wide acceptance in denoising and compression coding of images and signals. In this work we introduce a discrete lattice wavelet transform (DLWT). In the analysis part, the lattice structure contains two parallel transmission channels, which exchange information via two crossed lattice filters.
Olkkonen, H., Olkkonen, Juuso
openaire   +3 more sources

Fractional discrete Fourier transforms

Optics Letters, 1996
Direct calculation of fractional Fourier transforms from the expressions derived for their optical implementation is laborious. An extension of the discrete Fourier transform would have only O(N(2)) computational complexity. We define such a system, offer a general way to compute the fractional discrete Fourier transform matrix, and numerically ...
Z T, Deng, H J, Caulfield, M, Schamschula   +2 more
openaire   +2 more sources

Transforming Discretion

2022
Abstract Relying on semi-structured interviews with UK sectoral regulators, this chapter opens the ‘black box’ of the regulatory decision-making process and explores the influence of economic evidence and analysis on the regulators’ discretionary economic assessments. The chapter challenges the widely held belief that economic regulation
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Generalized discrete Fourier transforms: the discrete Fourier-Riccati-Bessel transform

Computer Physics Communications, 1995
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Stade, Eric, Layton, E. G.
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Discrete Transforms in Quantum Chaos

Bulletin of the Russian Academy of Sciences: Physics, 2021
V. Bunakov
semanticscholar   +1 more source