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[172]
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J .M. Vasconcelos, R. J. Cintra, and A. D. C. Nascimento.
New Mellin-based estimation and GoF criteria for the
Beta-Weibull model.
Journal of Statistical Theory and Applications, February 2025.
[ DOI ]
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[171]
|
B. Sritharan, C. U. S. Edussooriya, C. Wijenayake, R. J. Cintra, and
A. Madanayake.
Computationally efficient light field video compression using 5-D
approximate DCT.
Journal of Low Power Electronics and Applications, 15(1):2,
January 2025.
[ DOI |
http ]
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[170]
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R. J. Cintra, P. Martinez, A. Leite, V. A. Coutinho, F. M. Bayer,
A. Madanayake, and D. F. G. Coelho.
Gaussian kernel approximations require only bit-shifts.
Information, 15(10):618, October 2024.
[ DOI |
http ]
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[169]
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A. Madanayake, K. Lawrance, B. U. Kumarasiri, S. Sivasankar, T. Gunaratne,
C. U. S. Edussooriya, and R. J. Cintra.
Design of multichannel spectrum intelligence systems using
approximate discrete Fourier transform algorithm for antenna array-based
spectrum perception applications.
Algorithms, 17(8):338, August 2024.
[ DOI |
http ]
|
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[168]
|
A. Madanayake, K. Lawrance, S. Sivasankar, U. Kumarasiri, B. Gayanath, R. J.
Cintra, and M. Soumyajit.
Real-time 5.7 GHz realization of multidimensional 2D hybrid
approximate DFT spectrum sensors for RF situational awareness.
In 2024 IEEE 67th International Midwest Symposium on Circuits
and Systems (MWSCAS), pages 888--892. IEEE, August 2024.
[ DOI |
http ]
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[167]
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A. D. C. Nascimento, J. M. Vasconcelos, R. J. Cintra, and A. C. Frery.
Regression model for speckled data with extreme variability.
ISPRS Journal of Photogrammetry and Remote Sensing, 213:1--13,
July 2024.
[ DOI |
arXiv |
http ]
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[166]
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D. F. G. Coelho and R. J. Cintra.
Discrete Fourier transform approximations based on the
Cooley-Tukey radix-2 algorithm.
arXiv, 2024.
[ DOI |
arXiv |
http ]
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[165]
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R. J. Cintra.
An approximation for the 32-point discrete Fourier transform.
arXiv, 2024.
[ DOI |
arXiv |
http ]
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[164]
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A. P. Radünz, D. F. G. Coelho, F. M. Bayer, R. J. Cintra, and
A. Madanayake.
Fast data-independent KLT approximations based on integer
functions.
Multimedia Tools and Applications, 83(26):67303--67325, January
2024.
[ DOI |
arXiv |
http ]
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[163]
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B. G. Palm, F. M. Bayer, and R. J. Cintra.
Prediction intervals in the beta autoregressive moving average model.
Communications in Statistics - Simulation and Computation,
52(8):3635--3656, July 2023.
[ DOI |
arXiv |
http ]
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[162]
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H. Zhao, A. Madanayake, R. J. Cintra, and S. Mandal.
Analog current-mode 8-point approximate-DFT multi-beamformer with
4.7 Gbps channel capacity.
IEEE Access, 11:53716--53735, May 2023.
[ DOI |
http ]
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[161]
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A. P. Radünz, L. Portella, R. S. Oliveira, F. M. Bayer, and R. J. Cintra.
Extensions on low-complexity DCT approximations for larger
blocklengths based on minimal angle similarity.
Journal of Signal Processing Systems, 95(4):495--516, April
2023.
[ DOI |
arXiv |
http ]
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[160]
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L. Portella, D. F. G. Coelho, F. M. Bayer, A. Madanayake, and R. J. Cintra.
Radix-N algorithm for computing N2^n-point DFT
approximations.
IEEE Signal Processing Letters, 29:1838--1842, August 2022.
[ DOI |
http ]
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[159]
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B. G. Palm, F. M. Bayer, and R. J. Cintra.
2-D Rayleigh autoregressive moving average model for SAR image
modeling.
Computational Statistics & Data Analysis, 171:107453--1--16,
July 2022.
[ DOI |
arXiv |
http ]
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[158]
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T. L. T. da Silveira, D. R. Canterle, D. F. G. Coelho, V. A. Couting, F. M.
Bayer, and R. J. Cintra.
A class of low-complexity DCT-like transforms for image and video
coding.
IEEE Transactions on Circuits and Systems for Video Technology,
32(7):4364--4375, July 2022.
[ DOI |
arXiv |
http ]
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[157]
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A. P. Radünz, F. M. Bayer, and R. J. Cintra.
Low-complexity rounded KLT approximation for image compression.
Journal of Real-Time Image Processing, 19(1):173--183, February
2022.
[ DOI |
arXiv |
http ]
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[156]
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A. P. Radünz, T. L. T. da Silveira, F. M. Bayer, and R. J. Cintra.
Data-independent low-complexity KLT approximations for image and
video coding.
Signal Processing: Image Communication, 101:116585--1--16,
February 2022.
[ DOI |
arXiv |
http ]
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[155]
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B. G. Palm, F. M. Bayer, R. Machado, M. I. Pettersson, V. T. Vu, and R. J.
Cintra.
Robust Rayleigh regression method for SAR image processing in
presence of outliers.
IEEE Transactions on Geoscience and Remote Sensing, 60:1--12,
2022.
[ DOI |
arXiv |
http ]
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[154]
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V. A. Coutinho, R. J. Cintra, and F. M. Bayer.
Low-complexity three-dimensional discrete Hartley transform
approximations for medical image compression.
Computers in Biology and Medicine, 139:105018--1--13,
December 2021.
[ DOI |
arXiv |
http ]
|
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[153]
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J. M. Vasconcelos, R. J. Cintra, and A. D. C. Nascimento.
Goodness-of-fit measures based on the Mellin transform for beta
generalized lifetime data.
Mathematical Methods in the Applied Sciences,
44(18):14823--14848, September 2021.
[ DOI |
http ]
|
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[152]
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D. F. G. Coelho, R. J. Cintra, A. Madanayake, and S. M. Perera.
Low-complexity scaling methods for DCT-II approximations.
IEEE Transactions on Signal Processing, 69:4557--4566, July
2021.
[ DOI |
arXiv |
http ]
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[151]
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B. G. Palm, F. M. Bayer, and R. J. Cintra.
Signal detection and inference based on the beta binomial
autoregressive moving average model.
Digital Signal Processing, 109:102911--1--102911--12,
February 2021.
[ DOI |
arXiv |
http ]
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[150]
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D. R. Canterle, T. L. T. da Silveira, F. M. Bayer, and R. J. Cintra.
A multiparametric class of low-complexity transforms for image and
video coding.
Signal Processing, 176:107685, November 2020.
[ DOI |
http ]
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[149]
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J. M. Vasconcelos, R. J. Cintra, A. D. C. Nascimento, and L. C. Rêgo.
The compound truncated Poisson Cauchy model: A descriptor for
multimodal data.
Journal of Computational and Applied Mathematics, 378:112887,
November 2020.
[ DOI |
http ]
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[148]
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N. Liyanage, C. Wijenayake, C. U. S. Edussooriya, A. Madanayake, R. J. Cintra,
and E. Ambikairajah.
Low-complexity real-time light field compression using 4-D
approximate DCT.
In 2020 IEEE International Symposium on Circuits and Systems
(ISCAS), pages 1--5. IEEE, October 2020.
[ DOI |
http ]
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[147]
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V. A. Coutinho, V. Ariyarathna, D. F. G. Coelho, S. Pulipati, R. J. Cintra,
A. Madanayake, F. M. Bayer, and V. S. Dimitrov.
A low-SWaP 16-beam 2.4 GHz digital phased array receiver using
DFT approximation.
IEEE Transactions on Aerospace and Electronic Systems,
56(5):3645--3654, October 2020.
[ DOI |
http ]
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[146]
|
A. Borges, R. J. Cintra, D. F. G. Coelho, and V. S. Dimitrov.
Low-complexity architecture for AR(1) inference.
Electronics Letters, 56(14):732--734, July 2020.
[ DOI |
arXiv |
http ]
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[145]
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H. M. de Oliveira, V. V. Vermehren, and R. J. Cintra.
Multi-dimensional wavelets for scalable image decomposition: Orbital
wavelets.
International Journal of Wavelets, Multiresolution and
Information Processing, 18(5):2050038--1--2050038--11, June 2020.
[ DOI |
arXiv |
http ]
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[144]
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B. G. Palm, D. I. Alves, M. I. Pettersson, V. T. Vu, R. Machado, R. J. Cintra,
F. M. Bayer, P. Dammert, and H. Hellsten.
Wavelength-resolution SAR ground scene prediction based on image
stack.
Sensors, 20(7):2008--1--16, April 2020.
[ DOI |
arXiv |
http ]
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[143]
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R. J. Cintra, T. de Oliveira, and M. P. Mintchev.
Leakage prevention and real-time internal detection in pipelines
using a built-in wireless information and communication network.
SPE Journal, 25(05):2496--2507, March 2020.
[ DOI |
http ]
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[142]
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A. Madanayake, V. Ariyarathna, S. Madishetty, S. Pulipati, R. J. Cintra,
D. Coelho, R. Oliveira, F. M. Bayer, L. Belostotski, S. Mandal, and T. S.
Rappaport.
Towards a low-SWaP 1024-beam digital array: A 32-beam subsystem at
5.8 GHz.
IEEE Transactions on Antennas and Propagation,
68(2):900--912, February 2020.
[ DOI |
arXiv |
http ]
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[141]
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H. M. de Oliveira and R. J. Cintra.
Geometrical representation for number-theoretic transforms.
In Proceedings of the XXXVIII Braziliam Symposium on
Telecommunications and Signal Processing. Sociedade Brasileira de
Telecomunicações, 2020.
[ DOI |
arXiv |
http ]
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[140]
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B. G. Palm, F. M. Bayer, and R. J. Cintra.
Improved point estimation for the Rayleigh regression model.
IEEE Geoscience and Remote Sensing Letters, 19:1--4, 2020.
[ DOI |
arXiv |
http ]
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[139]
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A. Madanayake, R. J. Cintra, N. Akram, V. Ariyarathna, S. Mandal, V. A.
Coutinho, F. M. Bayer, D. F. G. Coelho, and T. S. Rappaport.
Fast radix-32 approximate DFTs for 1024-beam digital RF
beamforming.
IEEE Access, 8:96613--96627, 2020.
[ DOI |
arXiv |
http ]
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[138]
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S. M. Perera, A. Madanayake, and R. J. Cintra.
Efficient and self-recursive delay Vandermonde algorithm for
multi-beam antenna arrays.
IEEE Open Journal of Signal Processing, 1:64--76, 2020.
[ DOI |
arXiv |
http ]
|
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[137]
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S. M. Perera, A. Madanayake, and R. J. Cintra.
Radix-2 self-recursive sparse factorizations of delay Vandermonde
matrices for wideband multi-beam antenna arrays.
IEEE Access, 8:25498--25508, January 2020.
[ DOI |
arXiv |
http ]
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[136]
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R. J. Cintra, T. V. de Oliveira, and M. P. Mintchev.
Wireless network for real-time detection of pipeline leakages.
In Proceedings of the 2019 Big Data, Knowledge and Control
Systems Engineering (BdKCSE). IEEE, November 2019.
[ DOI |
http ]
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[135]
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B. G. Palm, F. M. Bayer, R. J. Cintra, M. I. Pettersson, and R. Machado.
Rayleigh regression model for ground type detection in SAR
imagery.
IEEE Geoscience and Remote Sensing Letters,
16(10):1660--1664, October 2019.
[ DOI |
arXiv |
http ]
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[134]
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F. M. Bayer, A. J. Kozakevicius, and R. J. Cintra.
An iterative wavelet threshold for signal denoising.
Signal Processing, 162:10--20, September 2019.
[ DOI |
arXiv |
http ]
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[133]
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R. S. Oliveira, R. J. Cintra, F. M. Bayer, T. L. T. da Silveira, A. Madanayake,
and A. Leite.
Low-complexity 8-point DCT approximation based on angle similarity
for image and video coding.
Multidimensional Systems and Signal Processing,
30(3):1363--1394, July 2019.
[ DOI |
arXiv |
http ]
|
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[132]
|
A. D. C. Nascimento, A. C. Frery, and R. J. Cintra.
Detecting changes in fully polarimetric SAR imagery with
statistical information theory.
IEEE Transactions on Geoscience and Remote Sensing,
57(3):1380--1392, March 2019.
[ DOI |
arXiv |
http ]
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[131]
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G. M. Cordeiro, R. J. Cintra, L. C. Rêgo, and A. D. C. Nascimento.
The gamma generalized normal distribution: A descriptor of SAR
imagery.
Journal of Computational and Applied Mathematics, 347:257--272,
February 2019.
[ DOI |
arXiv |
http ]
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[130]
|
V. Ariyarathna, D. F. G. Coelho, S. Pulipati, R. J. Cintra, F. M. Bayer, V. S.
Dimitrov, and A. Madanayake.
Multibeam digital array receiver using a 16-point multiplierless
DFT approximation.
IEEE Transactions on Antennas and Propagation,
67(2):925--933, February 2019.
[ DOI |
http ]
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[129]
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D. F. G. Coelho, S. Nimmalapalli, V. S. Dimitrov, A. Madanayake, R. J. Cintra,
and A. Tisserand.
Computation of 2D 8×8 DCT based on the Loeffler
factorization using algebraic integer encoding.
IEEE Transactions on Computers, 67(12):1692--1702, December
2018.
[ DOI |
http ]
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[128]
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R. J. Cintra, S. Duffner, C. Garcia, and A. Leite.
Low-complexity approximate convolution neural networks.
IEEE Transactions on Neural Networks and Learning Systems,
29(12):5981--5992, December 2018.
[ DOI |
arXiv |
http ]
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[127]
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D. F. G. Coelho, R. J. Cintra, F. M. Bayer, S. Kulasekera, A. Madanayake,
P. Martinez, T. L. T. Silveira, R. S. Oliveira, and V. S. Dimitrov.
Low-complexity Loeffler DCT approximations for image and video
coding.
Journal of Low Power Electronics and Applications, 8(4):1--26,
November 2018.
[ DOI |
arXiv |
http ]
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[126]
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B. G. Palm, D. I. Alves, V. T. Vu, M. I. Pettersson, F. M. Bayer, R. J. Cintra,
R. Machado, P. Dammert, and H. Hellsten.
Autoregressive model for multi-pass SAR change detection based on
image stacks.
In L. Bruzzone, F. Bovolo, and J. A. Benediktsson, editors,
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XXIV, pages 1078916--1--1078916--9, Berlin, October 2018. SPIE Remote
Sensing, SPIE.
[ DOI |
arXiv |
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[125]
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V. A. Coutinho, R. J. Cintra, F. M Bayer, P. A. M. Oliveira, R. S. Oliveira,
and A. Madanayake.
Pruned discrete Tchebichef transform approximation for image
compression.
Circuits, Systems, and Signal Processing, 37(10):4363--4383,
October 2018.
[ DOI |
http ]
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[124]
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D. F. G. Coelho, R. J. Cintra, A. C. Frery, and V. S. Dimitrov.
Fast matrix inversion and determinant computation for polarimetric
synthetic aperture radar.
Computers and Geosciences, 119:109--114, October 2018.
[ DOI |
arXiv |
http ]
|
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[123]
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V. Ariyarathna, A. Madanayake, X. Tang, D. Coelho, R. J. Cintra,
L. Belostotski, S. Mandal, and T. S. Rappaport.
Analog approximate FFT 8/16-beam algorithms, architectures and
CMOS circuits for 5G beamforming MIMO transceivers.
IEEE Journal on Emerging and Selected Topics in Circuits and
Systems, 8(3):466--479, September 2018.
[ DOI |
http ]
|
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[122]
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F. M. Bayer, R. J. Cintra, and F. Cribari-Neto.
Beta seasonal autoregressive moving average models.
Journal of Statistical Computation and Simulation,
88(15):2961--2981, July 2018.
[ DOI |
arXiv |
http ]
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[121]
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V. A. Coutinho, V. Ariyarathna, D. F. G. Coelho, R. J. Cintra, and
A. Madanayake.
An 8-beam 2.4 GHz digital array receiver based on a fast
multiplierless spatial DFT approximation.
In Proceedings of the 2018 IEEE/MTT-S International
Microwave Symposium - IMS, Philadelphia, PA, USA, June 2018. IEEE.
[ DOI |
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[120]
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H. Zhao, S. Mandal, V. Ariyarathna, A. Madanayake, and R. J. Cintra.
An offset-canceling approximate-DFT beamforming architecture for
wireless transceivers.
In 2018 IEEE International Symposium on Circuits and Systems
(ISCAS), pages 1--5. IEEE, May 2018.
[ DOI |
http ]
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[119]
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S. M. Perera, V. Ariyarathna, N. Udayanga, A. Madanayake, G. Wu,
L. Belostotski, Y. Wang, S. Mandal, R. J. Cintra, and T. S. Rappaport.
Wideband n-beam arrays using low-complexity algorithms and
mixed-signal integrated circuits.
IEEE Journal of Selected Topics in Signal Processing,
12(2):368--382, May 2018.
[ DOI |
http ]
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[118]
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V. Ariyarathna, V. A. Coutinho, S. Pulipati, A. Madanayake, R. T. Wijesekara,
C. U. S. Edussooriya, L. T. Bruton, T. K. Gunaratne, and R. J. Cintra.
Real-time 2-D FIR trapezoidal digital filters for 2.4 GHz
aperture receiver applications.
In 2018 Moratuwa Engineering Research Conference (MERCon),
pages 350--355. IEEE, May 2018.
[ DOI |
http ]
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[117]
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D. F. G. Coelho, R. J. Cintra, and V. S. Dimitrov.
Efficient computation of the 8-point DCT via summation by parts.
Journal of Signal Processing Systems, 90(4):505--514, April
2018.
[ DOI |
arXiv |
http ]
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[116]
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C. J. Tablada, T. L. T. da Silveira, R. J. Cintra, and F. M. Bayer.
DCT approximations based on Chen's factorization.
Signal Processing: Image Communication, 58:14--23, October
2017.
[ DOI |
arXiv |
http ]
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[115]
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D. F. G. Coelho, R. J. Cintra, N. Rajapaksha, G. J. Mendis, A. Madanayake, and
V. S. Dimitrov.
DFT computation using Gauss-Eisenstein basis: FFT algorithms
and VLSI architectures.
IEEE Transactions on Computers, 66(8):1442--1448, August
2017.
[ DOI |
http ]
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[114]
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V. Dimitrov, V. Ariyarathna, D. F. G. Coelho, L. Rakai, A. Madanayake, and
R. J. Cintra.
A parallel method for the computation of matrix exponential based on
truncated Neumann series.
In 2017 IEEE 24th Symposium on Computer Arithmetic (ARITH),
pages 35--42, London, UK, July 2017. IEEE.
[ DOI |
http ]
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[113]
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R. J. Cintra and F. M. Bayer.
Comments on `Area and power efficient DCT architecture for image
compression' by Dhandapani and Ramachandran.
EURASIP Journal on Advances in Signal Processing,
2017(50):1--7, July 2017.
[ DOI |
http ]
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[112]
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T. L. T. da Silveira, R. S. Oliveira, F. M. Bayer, R. J. Cintra, and
A. Madanayake.
Multiplierless 16-point DCT approximation for low-complexity image
and video coding.
Signal, Image and Video Processing, 11(2):227--233, June 2017.
[ DOI |
arXiv |
http ]
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[111]
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S. Bhattarai, A. Madanayake, R. J. Cintra, S. Duffner, and C. Garcia.
Digital architecture for real-time CNN-based face detection for
video processing.
In 2017 Cognitive Communications for Aerospace Applications
Workshop (CCAA), pages 1--6, Cleveland, OH, USA, June 2017. IEEE.
[ DOI |
http ]
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[110]
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P. A. M. Oliveira, R. J. Cintra, F. M. Bayer, S. Kulasekera, and A. Madanayake.
Low-complexity image and video coding based on an approximate
discrete Tchebichef transform.
IEEE Transactions on Circuits and Systems for Video
Technology, 27(5):1066--1076, May 2017.
[ DOI |
arXiv |
http ]
|
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[109]
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V. A. Coutinho, R. J. Cintra, and F. M. Bayer.
Low-complexity multidimensional DCT approximations for high-order
tensor data decorrelation.
IEEE Transactions on Image Processing, 26(5):2296--2310, May
2017.
[ DOI |
arXiv |
http ]
|
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[108]
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V. Ariyarathna, N. Udayanga, A. Madanayake, S. M. Perera, L. Belostotski, and
R. J. Cintra.
Design methodology of an analog 9-beam squint-free wideband IF
multi-beamformer for mmW applications.
In 2017 Moratuwa Engineering Research Conference (MERCon),
pages 236--240, Moratuwa, Sri Lanka, May 2017. IEEE.
[ DOI |
http ]
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[107]
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P. A. M. Oliveira, R. J. Cintra, F. M. Bayer, and A. Madanayake.
JPEG quantisation requires bit-shifts only.
Electronics Letters, 53(9):588--590, April 2017.
[ DOI |
http ]
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[106]
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R. M. Campello de Souza, H. M. de Oliveira, and R. J. Cintra.
Multiuser communication based on the DFT eigenstructure.
arXiv, February 2017.
[ DOI |
arXiv |
http ]
|
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[105]
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R. J. Cintra, F. M. Bayer, A. Madanayake, U. S. Potluri, and A. Edirisuriya.
Fast algorithms and architectures for 8-point DST-II/DST-VII
approximations.
Journal of Circuits, Systems, and Computers,
26(3):1750045--1--1750045--11, 2017.
[ DOI |
http ]
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[104]
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R. J. Cintra, F. M. Bayer, V. A. Coutinho, S. Kulasekera, A. Madanayake, and
A. Leite.
Energy-efficient 8-point DCT approximations: Theory and hardware
architectures.
Circuits, Systems, and Signal Processing, 35(11):4009--4029,
November 2016.
[ DOI |
arXiv |
http ]
|
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[103]
|
V. A. Coutinho, R. J. Cintra, F. M. Bayer, S. Kulasekera, and A. Madanayake.
A multiplierless pruned DCT-like transformation for image and video
compression that requires ten additions only.
Journal of Real-Time Image Processing, 12(2):247--255, August
2016.
[ DOI |
arXiv |
http ]
|
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[102]
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D. F. G. Coelho, R. J. Cintra, S. Kulasekera, A. Madanayake, and V. S.
Dimitrov.
Error-free computation of 8-point discrete cosine transform based on
the Loeffler factorisation and algebraic integers.
IET Signal Processing, 10(6):633--640, August 2016.
[ DOI |
http ]
|
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[101]
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T. L. T. Silveira, F. M. Bayer, R. J. Cintra, S. Kulasekera, and A. Madanayake.
An orthogonal 16-point approximate DCT for image and video
compression.
Multidimensional Systems and Signal Processing, 27(1):87--104,
January 2016.
[ DOI |
arXiv |
http ]
|
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[100]
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A. P. Radünz, D. R. Canterle, F. M. Bayer, and R. J Cintra.
Signed principal component analysis with application in image
compression.
In Anais do XXII Simpósio Nacional de Probabilidade e
Estatística [Proceedings of the 22th National Symposium on Probability
and Statistics], 2016.
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[99]
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F. M. Bayer, A. J. Kozakevicius, and R. J Cintra.
An iterative wavelet threshold for signal denoising.
In Anais do XXII Simpósio Nacional de Probabilidade e
Estatística [Proceedings of the 22th National Symposium on Probability
and Statistics], 2016.
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VLSI computational architectures for the arithmetic cosine
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IEEE Transactions on Computers, 64(9):2708--2715, September
2015.
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C. J. Tablada, F. M. Bayer, and R. J. Cintra.
A class of DCT approximations based on the Feig-Winograd
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Signal Processing, 113:38--51, August 2015.
[ DOI |
arXiv |
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Y. Pauchard, R. J. Cintra, A. Madanayake, and F. M. Bayer.
Fast computation of residual complexity image similarity metric using
low-complexity transforms.
IET Image Processing, 9(8):699--708, August 2015.
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[95]
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P. A. M. Oliveira, R. J. Cintra, F. M. Bayer, S. Kulasekera, and A. Madanayake.
A discrete Tchebichef transform approximation for image and video
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IEEE Signal Processing Letters, 22(8):1137--1141, August
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S. Kulasekera, A. Madanayake, D. Suarez, R. J. Cintra, and F. M. Bayer.
Multi-beam receiver apertures using multiplierless 8-point
approximate DFT.
In 2015 IEEE Radar Conference (RadarCon), pages 1244--1249,
Arlington, VA, May 2015. IEEE.
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V. Ariyarathna, S. Kulasekera, A. Madanayake, K. S. Lee, D. Suarez, R. J.
Cintra, F. M. Bayer, and L. Belostotski.
Multi-beam 4 GHz microwave apertures using current-mode DFT
approximation on 65 nm CMOS.
In 2015 IEEE MTT-S International Microwave Symposium, pages
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S. Kulasekera, A. Madanayake, C. Wijenayake, F. M. Bayer, D. Suarez, and R. J.
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Multi-beam 8×8 RF aperture digital beamformers using
multiplierless 2-D FFT approximations.
In 2015 Moratuwa Engineering Research Conference (MERCon),
pages 260--264, Moratuwa, April 2015. IEEE.
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Potluri.
Low-power VLSI architectures for DCT/DWT: Precision vs
approximation for HD video, biomedical, and smart antenna applications.
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2015.
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V. A. Coutinho, R. J. Cintra, F. M. Bayer, S. Kulasekera, and A. Madanayake.
Low-complexity pruned 8-point DCT approximations for image
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In 2015 International Conference on Electronics, Communications
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H. M. de Oliveira, R. G. F. Távora, R. J. Cintra, and R. M. Campello
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arXiv, 2015.
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T. L. T. Silveira, F. M. Bayer, R. J. Cintra, and A. J. Kozakevicius.
Algoritmos rápidos para cifragem de imagens utilizando
aproximações da DCT de comprimento 8 [Fast algorithms for
image encryption using 8-point DCT approximations].
In Proceeding Series of the Brazilian Society of Computational
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R. J. Cintra, L. C. Rêgo, G. M. Cordeiro, and A. D. C. Nascimento.
Beta generalized normal distribution with an application for SAR
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Statistics, 48(2):279--294, December 2014.
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arXiv |
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D. Suarez, R. J. Cintra, F. M. Bayer, S. Kulasekera, and A. Madanayake.
Multi-beam RF aperture using multiplierless FFT approximation.
Electronics Letters, 50(24):1788--1790, November 2014.
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arXiv |
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A. D. C. Nascimento, A. C. Frery, and R. J. Cintra.
Bias correction and modified profile likelihood under the Wishart
complex distribution.
IEEE Transactions on Geoscience and Remote Sensing,
52(8):4932--4941, August 2014.
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arXiv |
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S. K. Madishetty, A. Madanayake, R. J. Cintra, V. S. Dimitrov, and D. H.
Mugler.
Algebraic integer architecture with minimum adder count for the 2-D
Daubechies 4-tap filters banks.
Multidimensional Systems and Signal Processing, 25(4):829--845,
August 2014.
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[83]
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S. K. Madishetty, A. Madanayake, R. J. Cintra, and V. S. Dimitrov.
Precise VLSI architecture for AI based 1-D/ 2-D Daub-6
wavelet filter banks with low adder-count.
IEEE Transactions on Circuits and Systems I: Regular Papers,
61(7):1984--1993, July 2014.
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U. S. Potluri, A. Madanayake, R. J. Cintra, F. M. Bayer, S. Kulasekera, and
A. Edirisuriya.
Improved 8-point approximate DCT for image and video compression
requiring only 14 additions.
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61(6):1727--1740, June 2014.
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S. Kulasekera, A. Madanayake, R. J. Cintra, F. M. Bayer, and U. Potluri.
Low-complexity multiplierless DCT approximations for low-power
HEVC digital IP cores.
In Donnie Self, Matthew F. Pellechia, Kannappan Palaniappan,
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R. J. Cintra, F. M. Bayer, and C. J. Tablada.
Low-complexity 8-point DCT approximations based on integer
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Signal Processing, 99:201--214, June 2014.
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A. M. C. Calado, R. A. N. Ramos, R. J. Cintra, L. C. Alves, and
M. Tinucci-Costa.
Expressão da glicoproteína-P e da MRP1 em tecidos de
cães portadores de leishmaniose visceral.
Ars Veterinaria, 30(2):71--76, March 2014.
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A. D. C. Nascimento, M. M. Horta, A. C. Frery, and R. J. Cintra.
Comparing edge detection methods based on stochastic entropies and
distances for PolSAR imagery.
IEEE Journal of Selected Topics in Applied Earth Observations
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P. A. M. Oliveira, R. J. Cintra, and F. M. Bayer.
Aproximação da transformada dos momentos de Tchebichef
para compressão de imagens [Tchebichef moment transform approximation
for compression].
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A single-channel architecture for algebraic integer based 8×8
2-D DCT computation.
IEEE Transactions on Circuits and Systems for Video Technology,
23(12):2083--2089, December 2013.
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arXiv |
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F. M. Bayer, R. J. Cintra, A. Madanayake, and U. S. Potluri.
Multiplierless approximate 4-point DCT VLSI architectures for
transform block coding.
Electronics Letters, 49(24):1532--1534, November 2013.
[ DOI |
arXiv |
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R. J. Cintra, A. D. C. Nascimento, and A. C. Frery.
Parametric and nonparametric tests for speckled imagery.
Pattern Analysis and Applications, 16(2):141--161, October
2013.
[ DOI |
arXiv |
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[73]
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J. Leão, H. Saulo, M. Bourguignon, R. J. Cintra, L. C. Rêgo, and G. M.
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On some properties of the beta inverse Rayleigh distribution.
Chilean Journal of Statistics, 4(2):111--131, September 2013.
[ arXiv |
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A. C. Frery, R. J. Cintra, and A. D. C. Nascimento.
Contrast measures based on the complex correlation coefficient for
PolSAR imagery.
In Conference Proceedings of 2013 Asia-Pacific Conference on
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C. J. Tablada, F. M. Bayer, and R. J. Cintra.
Duas aproximações para a DCT baseadas na
fatoração de Chen [Two DCT approximations based on the
Chen factorization].
In Anais do XXXI Simpósio Brasileiro de
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R. S. Oliveira, R. J. Cintra, F. M. Bayer, and C. J. Tablada.
Uma aproximação ortogonal para a DCT [An orthogonal
approximation for the DCT].
In Anais do XXXI Simpósio Brasileiro de
Telecomunicações [Proceedings of the XXXI Brazilian Symposium
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H. M. Oliveira, R. J. Cintra, and R. C. Oliveira.
Uma representação kotel'nikov para wavelets e bancos de
filtros sem superposição espectral [Kotel'nikov-based
representation for wavelets and filter banks without spectral overlapping].
In Anais do XXXI Simpósio Brasileiro de
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on Telecommunications], Fortaleza, Brazil, September 2013. Sociedade
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A. Madanayake, R. Wimalagunarathne, D. G. Dansereau, R. J. Cintra, and L. T.
Bruton.
VLSI architecture for 4-D depth filtering.
Signal, Image and Video Processing, 9(4):809--818, July 2013.
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S. Madhishetty, A. Madanayake, R. J. Cintra, D. Mugler, and V. S. Dimitrov.
VLSI architectures for the 4-tap and 6-tap 2-D Daubechies
wavelet filters using algebraic integers.
IEEE Transactions on Circuits and Systems I: Regular Papers,
60(6):1455--1468, June 2013.
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A. C. Frery, R. J. Cintra, and A. D. C. Nascimento.
Entropy-based statistical analysis of PolSAR data.
IEEE Transactions on Geoscience and Remote Sensing,
51(6):3733--3743, June 2013.
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L. C. Rêgo and R. J. Cintra.
An extension of the Dirichlet density for sets of Gaussian
integers.
Canadian Mathematical Bulletin, 56(1):161--172, March 2013.
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A. C. Frery, A. D. C. Nascimento, and R. J. Cintra.
Analytic expressions for stochastic distances between relaxed complex
Wishart distributions.
IEEE Transactions on Geoscience and Remote Sensing,
52(2):1213--1226, February 2013.
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arXiv |
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N. Rajapaksha, A. Edirisuriya, A. Madanayake, R. J. Cintra, D. Onen, I. Amer,
and V. S. Dimitrov.
Asynchronous realization of algebraic integer-based 2D DCT using
Achronix Speedster SPD60 FPGA.
Journal of Electrical and Computer Engineering, 2013:1--9,
2013.
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A. Edirisuriya, H. P. L. Arjuna Madanayake, F. M. Bayer, and R. J. Cintra.
A multiplication-free digital architecture for 16×16 2-D
DCT/DST transform with applications in H.265 reconfigurable video
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L. C. Rêgo, R. J. Cintra, and G. M. Cordeiro.
On some properties of the beta normal distribution.
Communications in Statistics - Theory and Methods,
41(20):3722--3738, October 2012.
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arXiv |
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U. S. Potluri, A. Madanayake, R. J. Cintra, F. M. Bayer, and N. Rajapaksha.
Multiplier-free DCT approximations for RF multi-beam digital
aperture-array space imaging and directional sensing.
Measurement Science and Technology, 23(11):1--15, October 2012.
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F. M. Bayer, R. J. Cintra, A. Edirisuriya, and A. Madanayake.
A digital hardware fast algorithm and FPGA-based prototype for a
novel 16-point approximate DCT for image compression applications.
Measurement Science and Technology, 23(11):1--10, October 2012.
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D. F. G. Coelho, R. J. Cintra, L. C. Souza, A. Madanayake, and V. S. Dimitrov.
Representação numérica em inteiros de Gauss-Eisenstein
[Gauss-Eisenstein integer number representation].
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A. D. C. Nascimento, R. J. Cintra, and A. C. Frery.
Testes de hipóteses baseados em teoria da
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information theory and likelihood ratios: An application to PolSAR data].
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A. Madanayake, R. J. Cintra, V. S. Dimitrov, and L. T. Bruton.
Block-parallel systolic-array architectures for 2-D NTT-based
fragile watermark embedding.
Parallel Processing Letters, 22(3):1250009--1--1250009--12,
July 2012.
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G. M. Cordeiro, R. J. Cintra, L. C. Rêgo, and E. M. M. Ortega.
The McDonald normal distribution.
Pakistan Journal of Statistics and Operation Research,
8(3):301--329, July 2012.
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arXiv |
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G. J. A. Amaral, R. J. Cintra, and V. E. Silva Júnior.
Jogos computacionais para o ensino de análise de
regressão [Computational games for teaching regression analysis].
In Anais do XX Simpósio Nacional de Probabilidade e
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A row-parallel 8×8 2D DCT architecture using algebraic
integer based exact computation.
IEEE Transactions on Circuits and Systems for Video Technology,
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S. Madhishetty, A. Madanayake, R. J. Cintra, D. Mugler, and V. S. Dimitrov.
Error-free VLSI architecture for the 2-D Daubechies 4-tap
filter using algebraic integers.
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A. Edirisuriya, A. Madanayake, V. Dimitrov, R. J. Cintra, and J. Adikari.
VLSI architecture for 8-point AI-based Arai DCT having low
area-time complexity and power at improved accuracy.
Journal of Low Power Electronics and Applications,
2(2):127--142, March 2012.
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A. D. C. Nascimento, R. J. Cintra, M. Horta, and A. C. Frery.
Edge detection in polSAR imagery with stochastic entropies and
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Soma por partes para sinais periódicos e transformadas
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In Anais de XXX Simpósio Brasileiro de
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F. M. Bayer and R. J. Cintra.
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Electronics Letters, 48(15):919--921, 2012.
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T. Cooklev, H. Doğan, R. J. Cintra, and H. Yildiz.
A generalized prefix construction for OFDM systems over
quasi-static channels.
IEEE Transactions on Vehicular Technology, 60(8):3684--3693,
October 2011.
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R. J. Cintra and F. M. Bayer.
A DCT approximation for image compression.
IEEE Signal Processing Letters, 18(10):579--582, October 2011.
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A. C. Frery, A. D. C. Nascimento, and R. J. Cintra.
Information theory and image understanding: An application to
polarimetric SAR imagery.
Chilean Journal of Statistics, 2(2):81--100, September 2011.
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R. J. Cintra.
An integer approximation method for discrete sinusoidal transforms.
Circuits, Systems, and Signal Processing, 30(6):1481--1501, May
2011.
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H. P. L. Arjuna Madanayake, R. J. Cintra, D. Onen, V. S. Dimitrov, and
L. Bruton.
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digital video processing.
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J. Adikari, V. S. Dimitrov, and R. J. Cintra.
A new algorithm for double scalar multiplication over Koblitz
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A. C. Frery, A. D. C. Nascimento, and R. J. Cintra.
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R. J. Cintra and V. S. Dimitrov.
The arithmetic cosine transform: Exact and approximate algorithms.
IEEE Transactions on Signal Processing, 58(6):3076--3085, June
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A. D. C. Nascimento, R. J. Cintra, and A. C. Frery.
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IEEE Transactions on Geoscience and Remote Sensing,
48(1):373--385, January 2010.
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A. D. C. Nascimento, R. J. Cintra, and A. C. Frery.
Measuring synthetic aperture radar target differences with stochastic
distances.
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R. J. Cintra, V. S. Dimitrov, H. M. Oliveira, and R. M. Campello de Souza.
Fragile watermarking using finite field trigonometrical transforms.
Signal Processing: Image Communication, 24(7):587--597, August
2009.
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R. J. Cintra and T. Cooklev.
Robust image watermarking using non-regular wavelets.
Signal, Image and Video Processing, 3(3):241--250, August 2009.
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A. D. C. Nascimento, R. J. Cintra, and A. C. Frery.
Stochastic distances and hypothesis testing in speckled data.
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Remoto [Proceedings of the XIV Brazilian Symposium on Remote Sensing], pages
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A. D. C. Nascimento, A. C. Frery, and R. J. Cintra.
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R. J. Cintra.
Algoritmo de soma por partes para sinais periódicos
[Summation-by-parts algorithm for periodic signals].
In Anais do XVIII Simpósio Nacional de Probabilidade e
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R. J. Cintra, L. C. Rêgo, H. M. Oliveira, and R. M. Campello de Souza.
On a density for sets of integers.
In Anais do VII Encontro Regional de Matemática Aplicada e
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Computational Mathematics], Recife, Brazil, 2007.
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L. R. Soares, H. M. Oliveira, and R. J. Cintra.
Signal analysis using Fourier-like wavelets.
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L. R. Soares, H. M. Oliveira, and R. J. Cintra.
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analysis.
In Proceedings of the IEEE/PES Transmission & Distribution
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I. V. Tchervensky, R. J. Cintra, E. Neshev, V. S. Dimitrov, D. C. Sadowski, and
M. P. Mintchev.
Centre-specific multichannel electrogastrographic testing utilizing
wavelet-based decomposition.
Physiological Measurement, 27(7):569--584, April 2006.
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H. M. Oliveira, R. J. Cintra, and R. M. Campello de Souza.
An arithmetical probability.
In Anais do XVII Simpósio Nacional de Probabilidade e
Estatística [Proceedings of the 17th National Symposium on Probability
and Statistics], Caxambu, Brazil, 2006.
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[24]
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R. J. Cintra, H. M. Oliveira, and C. O. Cintra.
Trigonometrical rounded transforms.
In Anais do XVII Simpósio Nacional de Probabilidade e
Estatística [Proceedings of the 17th National Symposium on Probability
and Statistics], Caxambu, Brazil, 2006.
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[23]
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D. F. Souza, R. J. Cintra, and H. M. Oliveira.
Uma ferramenta para análise de sons musicais: A série
quantizada de Fourier [A mathematical tool for acoustic signal analysis:
The quantized Fourier series].
In Anais do XXII Simpósio Brasileiro de
Telecomunicações [Proceedings of the XXII Brazilian Symposium
on Telecommunications], Campinas, Brazil, September 2005. Sociedade
Brasileira de Telecomunicações.
[ DOI |
http ]
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[22]
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L. R. Soares, H. M. Oliveira, and R. J. Cintra.
The Fourier-like and Hartley-like wavelet analysis based on
Hilbert transforms.
In Anais do XXII Simpósio Brasileiro de
Telecomunicações [Proceedings of the XXII Brazilian Symposium
on Telecommunications], Campinas, Brazil, September 2005. Sociedade
Brasileira de Telecomunicações.
[ DOI |
arXiv |
http ]
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[21]
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I. V. Tchervensky, R. J. Cintra, E. Neshev, V. S. Dimitrov, and M. P. Mintchev.
Center-specific multichannel EGG testing utilizing wavelet-based
decomposition.
In Proceedings og the Thirteenth International Workshop on
Electrogastrography, Chicago, IL, May 2005.
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[20]
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C. Newton-Price, R. J. Cintra, D. T. Westwick, and M. P. Mintchev.
Classification of biomedical signals using the dynamics of the false
nearest neighbours (DFNN) algorithm.
International Journal on Information Theory and Applications,
12:18--28, 2005.
[ .pdf ]
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[19]
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C. Newton-Price, R. J. Cintra, D. T. Westwick, and M. P. Mintchev.
Classification of biomedical signals using the dynamics of the false
nearest neighbours (DFNN) algorithm.
In Proceedings of the Third International Conference on
Information Research, Applications and Education i.TECH 2005. Institute of
Information Theories and Applications, 2005.
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[18]
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R. J. Cintra, I. V. Tchervensky, V. S. Dimitrov, and M. P. Mintchev.
Optimal wavelets for electrogastrography.
In Proceedings of the 26th Annual International Conference of
the IEEE Engineering in Medicine and Biology Society (IEMBS '04), volume 1,
pages 329--332, San Francisco, CA, September 2004. IEEE.
[ DOI |
arXiv |
http ]
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[17]
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R. J. Cintra, I. V. Tchervensky, V. S. Dimitrov, and M. P. Mintchev.
Wavelet analysis in a canine model of gastric electrical uncoupling.
Physiological Measurement, 25(6):1355--1369, September 2004.
[ DOI |
arXiv |
http ]
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[16]
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R. J. Cintra and H. M. Oliveira.
A short survey on arithmetic transforms and the arithmetic Hartley
transform.
Journal of Communication and Information Systems, 19(2):68--79,
August 2004.
ISSN: 1980-6604.
[ DOI |
arXiv |
http ]
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[15]
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L. R. Soares, H. M. de Oliveira, and R. J. Cintra.
New compactly supported scaling and wavelet functions derived from
Gegenbauer polynomials.
In Proceedings of the Canadian Conference on Electrical and
Computer Engineering, volume 4, pages 2347--2350. IEEE, May 2004.
[ DOI |
http ]
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[14]
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M. M. S. Lira, H. M. Oliveira, and R. J. Cintra.
Elliptic-cylindrical wavelets: the Mathieu wavelets.
IEEE Signal Processing Letters, 11(1):52--55, January 2004.
[ DOI |
http ]
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[13]
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R. J. Cintra, H. M. Oliveira, and L. R. Soares.
On filter banks and wavelets based on Chebyshev polynomials.
In Proceedings of the 7th WSEAS International Conference on
Circuits, pages 195--200, Corfu Island, Greece, July 2003. WSEAS, WSEAS
Press.
[ arXiv ]
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[12]
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L. R. Soares, R. J. Cintra, H. M. Oliveira, and R. M. C. Souza.
Fourier eigenfunctions, Gabor uncertainty principle and
isoresolution wavelets.
In Anais do XX Simpósio Brasileiro de
Telecomunicações [Proceedings of the XX Brazilian Symposium on
Telecommunications], pages 61--65, Rio de Janeiro, Brazil, 2003. Sociedade
Brasileira de Telecomunicações.
[ DOI |
arXiv |
http ]
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[11]
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R. J. Cintra, H. M. Oliveira, and L. R. Soares.
Chebyshev wavelets.
In Anais do XX Simpósio Brasileiro de
Telecomunicações [Proceedings of the XX Brazilian Symposium on
Telecommunications], pages 89--94, Rio de Janeiro, Brazil, 2003.
[ DOI |
http ]
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[10]
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C. O. Cintra and R. J. Cintra.
O teorema de Pitágoras [The Pythagorean theorem].
Tambor, 1:111--122, 2003.
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[9]
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R. J. Cintra, H. M. Oliveira, and C. O. Cintra.
The rounded Hartley transform.
In Proceedings of the IEEE International Telecommunications
Symposium - ITS'2002, Natal, Brazil, September 2002. Sociedade Brasileira de
Telecomunicações.
[ DOI |
arXiv |
http ]
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[8]
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R. Cintra and H. de Oliveira.
How to interpolate in arithmetic transform algorithms.
In Proceedings of the IEEE International Conference on
Acoustics, Speech, and Signal Processing (ICASSP), volume 4, page 4169.
IEEE, May 2002.
[ DOI |
http ]
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[7]
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M. M. S. Lira, H. M. Oliveira, R. J. Cintra, and R. M. Campello de Souza.
Wavelets for elliptical waveguide problems.
In Proceedings of the 2nd WSEAS International Conference on
Wavelet Analysis and Multirate Systems (WAMUS), Vouliagmeni, Greece, 2002.
[ arXiv ]
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[6]
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R. J. Cintra and H. M. Olivera.
Interpolating in arithmetic transforms.
In Proceedings of the 6th International Multiconference on
Circuits, Systems, Communications and Computers, Rethymno, Greece, 2002.
WSEAS.
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[5]
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R. J. Cintra, H. M. Oliveira, and R. M. Campello de Souza.
Um algoritmo bifuncional para a avaliação dos espectros
de Hadamard e Hartley [A dual algorithm for Hadamard and Hartley
spectra evaluation].
In Anais do XIX Simpósio Brasileiro de
Telecomunicações [Proceedings of the XIX Brazilian Symposium on
Telecommunications], Fortaleza, Brazil, September 2001. Sociedade Brasileira
de Telecomunicações.
[ DOI |
http ]
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[4]
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R. J. Cintra, H. M. Oliveira, and R. M. Campello de Souza.
A factorization scheme for some discrete Hartley transform
matrices.
In J. R. Miranda, editor, Proceedings of the International
Conference on System Engineering Communications and Information Technologies
ICSECIT 2001, Punta Arenas, Chile, April 2001. Universidad de Magallanes.
[ arXiv ]
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[3]
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H. M. Oliveira, R. M. Campello de Souza, R. J. Cintra, and A. N. Kauffman.
A transformada aritmética de Hartley [The arithmetic Hartley
transform].
In Anais do XVIII Simpósio Brasileiro de
Telecomunicações [Proceedings of the XVIII Brazilian Symposium
on Telecommunications], Gramado, Brazil, September 2000. Sociedade
Brasileira de Telecomunicações.
[ DOI |
http ]
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[2]
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H. M. de Oliveira, R. J. de Sobral Cintra, and R. M. Campello de Souza.
The multilayer Hadamard decomposition of discrete Hartley
transforms.
In Anais do XVIII Simpósio Brasileiro de
Telecomunicações [Proceedings of the XVIII Brazilian Symposium
on Telecommunications], Gramado, Brazil, September 2000. Sociedade
Brasileira de Telecomunicações.
[ DOI |
arXiv |
http ]
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[1]
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R. J. Cintra and A. F. Dias e Silva.
Experimentos com morfologia matemática em análise de imagens
[Image analysis using mathematical morphology].
In Anais do V Congresso de Iniciação
Científica [Proceedings of the V Scientific Initiation Congress], page
347, Recife, Brazil, October 1997.
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