Results 21 to 30 of about 2,401,712 (281)

Generalized Discrete Fourier Transform on the Base of Lagrange and Hermite Interpolation Formulas

Lobachevskii Journal of Mathematics, 2022
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Sitnik, S. M., Yaremko, O .E., Yaremko, N. N.   +2 more
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CUTTING OF CONTENT REDUNDANCY OF THE IMAGIES ON THE BASIS OF CLASSIFICATION OF OBJECTS AND BACKGROUND

Міжнародний науково-технічний журнал "Проблеми керування та інформатики", 2007
In the given operation the practical results of computer simulation of compression of some classes of the imagies are presented. The image, before encoding, is previously separated into two parts — object and background.
V.G. Ivanov, M.G. Lyubarskiy, Yu.V. Lomonosov   +2 more
doaj   +1 more source

Generalizing the discrete fourier transform

Discrete Mathematics, 1985
The author defines the generalized discrete Fourier transform (GDFT (\({\mathbb{F}}G))\) as being the mapping \(\sigma_ G: {\mathbb{F}}G\to A_ 1\oplus...\oplus A_ s\) which decomposes the semisimple group algebra \({\mathbb{F}}G\) into simple Wedderburn components \(A_ i\), \(i=1,...,s\).
openaire   +2 more sources

A generalized Walsh system for arbitrary matrices

Demonstratio Mathematica, 2019
In this paper we study in detail a variation of the orthonormal bases (ONB) of L2[0, 1] introduced in [Dutkay D. E., Picioroaga G., Song M. S., Orthonormal bases generated by Cuntz algebras, J. Math. Anal.
Harding Steven N., Picioroaga Gabriel
doaj   +1 more source

An Exact Method to Determine the Photonic Resonances of Quasicrystals Based on Discrete Fourier Harmonics of Higher-Dimensional Atomic Surfaces

Crystals, 2016
A rigorous method for obtaining the diffraction patterns of quasicrystals is presented. Diffraction patterns are an essential analytical tool in the study of quasicrystals, since they can be used to determine their photonic resonances.
Farhad A. Namin, Douglas H. Werner
doaj   +1 more source

Trigonometric Interpolation Using the Discrete Fourier Transform [PDF]

, 2022
The Fourier transform (and all its versions, discrete/continuous/finite/infinite), covers deep and abstract mathematical concepts, and can easily overwhelm with detail.
Ponce Campuzano, Juan Carlos
core  

Generalized Fractional Interpolated Discrete Fourier Transform with Rectangular Window for Frequency Estimation in Noisy Sinewave Signals

Metrology
Accurate and efficient frequency estimation is essential in many scientific fields and has led to the development of various algorithms. Commonly used methods involve applying the Discrete Fourier Transform followed by spectral interpolation.
Fernando M. Janeiro, Pedro M. Ramos
doaj   +1 more source

An improved architecture for the adaptive discrete cosine transform [PDF]

, 1996
This paper presents a new approach to the efficient realisation of the discrete cosine transform for the specific case of interlaced image sequence coding.
Martin, F, Bull, DR
core   +1 more source

Two Versions of Dunkl Linear Canonical Wavelet Transforms and Applications

Mathematics
Among the class of generalized Fourier transformations, the linear canonical transform is of crucial importance, mainly due to its higher degrees of freedom compared to the conventional Fourier and fractional Fourier transforms.
Saifallah Ghobber, Hatem Mejjaoli
doaj   +1 more source

Generalized DFT-s-OFDM Waveforms Without Cyclic Prefix

IEEE Access, 2018
This paper deals with generalized discrete Fourier transform-spread-orthogonal frequency division multiplexing (G-DFT-s-OFDM) waveforms, which replace the cyclic prefix of traditional OFDM/DFT-s-OFDM with an internal guard period.
Gilberto Berardinelli
doaj   +1 more source