Zobrazeno 1 - 10
of 1 083
pro vyhledávání: '"Coelho, D."'
Publikováno v:
Multimedia Tools and Applications, 83(26):67303--67325, January 2024
The Karhunen-Lo\`eve transform (KLT) stands as a well-established discrete transform, demonstrating optimal characteristics in data decorrelation and dimensionality reduction. Its ability to condense energy compression into a select few main componen
Externí odkaz:
http://arxiv.org/abs/2410.09227
Autor:
Coelho, D. F. G., Cintra, R. J.
This report elaborates on approximations for the discrete Fourier transform by means of replacing the exact Cooley-Tukey algorithm twiddle-factors by low-complexity integers, such as $0, \pm \frac{1}{2}, \pm 1$.
Comment: Originally written in Oc
Comment: Originally written in Oc
Externí odkaz:
http://arxiv.org/abs/2402.16225
Autor:
Coelho, D. F. G., Cintra, R. J., Bayer, F. M., Kulasekera, S., Madanayake, A., Martinez, P. A. C., Silveira, T. L. T., Oliveira, R. S., Dimitrov, V. S.
Publikováno v:
J. Low Power Electron. Appl. 2018, 8(4), 46
This paper introduced a matrix parametrization method based on the Loeffler discrete cosine transform (DCT) algorithm. As a result, a new class of eight-point DCT approximations was proposed, capable of unifying the mathematical formalism of several
Externí odkaz:
http://arxiv.org/abs/2207.14463
Autor:
Madanayake, A., Cintra, R. J., Akram, N., Ariyarathna, V., Mandal, S., Coutinho, V. A., Bayer, F. M., Coelho, D., Rappaport, T. S.
Publikováno v:
IEEE Access, vol. 8, 2020
The discrete Fourier transform (DFT) is widely employed for multi-beam digital beamforming. The DFT can be efficiently implemented through the use of fast Fourier transform (FFT) algorithms, thus reducing chip area, power consumption, processing time
Externí odkaz:
http://arxiv.org/abs/2207.05866
Autor:
da Silveira, T. L. T., Canterle, D. R., Coelho, D. F. G., Coutinho, V. A., Bayer, F. M., Cintra, R. J.
Publikováno v:
IEEE Transactions on Circuits and Systems for Video Technology, v. 32, n. 7, July 2022
The discrete cosine transform (DCT) is a relevant tool in signal processing applications, mainly known for its good decorrelation properties. Current image and video coding standards -- such as JPEG and HEVC -- adopt the DCT as a fundamental building
Externí odkaz:
http://arxiv.org/abs/2206.00122
Autor:
Trovisco, R., Freitas, C., Serino, M., Ferreira, P., Martins, B., Coelho, D., Melo, N., Fernandes, G., Magalhães, A., Bastos, H.N.
Publikováno v:
In Pulmonology November-December 2024 30(6):555-562
This paper introduces a collection of scaling methods for generating $2N$-point DCT-II approximations based on $N$-point low-complexity transformations. Such scaling is based on the Hou recursive matrix factorization of the exact $2N$-point DCT-II ma
Externí odkaz:
http://arxiv.org/abs/2108.02119
Autor:
Mota, P.C., Soares, M.L., Ferreira, A.C., Santos, R.F., Rufo, J.C., Vasconcelos, D., Carvalho, A., Guimarães, S., Vasques-Nóvoa, F., Cardoso, C., Melo, N., Alexandre, A.T., Coelho, D., Novais-Bastos, H., Morais, A.
Publikováno v:
In Pulmonology
Publikováno v:
Electronics Letters 56 (14), 732-734, 2020
In this Letter, we propose a low-complexity estimator for the correlation coefficient based on the signed $\operatorname{AR}(1)$ process. The introduced approximation is suitable for implementation in low-power hardware architectures. Monte Carlo sim
Externí odkaz:
http://arxiv.org/abs/2008.09633
Computational modeling of pattern formation in nonequilibrium systems is a fundamental tool for studying complex phenomena in biology, chemistry, materials science and engineering. The pursuit for theoretical descriptions of some among those physical
Externí odkaz:
http://arxiv.org/abs/2007.16080