Selected Journal Papers

[1] 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. [ bib | DOI ]
[2] 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, March 2015. [ bib | DOI ]
[3] A. Madanayake, R. J. Cintra, F. M. Bayer, V. Dimitrov, K. Wahid, N. T. Rajapaksha, S. Kulasekera, A. Edirisuriya, S. K. Madishetty, and U. S. Potluri. Low-power VLSI architectures for DCT/DWT: Precision vs approximation for HD video, biomedical, and smart antenna applications. IEEE Circuits and Systems Magazine, 15(1):25-47, February 2015. [ bib | DOI ]
[4] P. A. M. Oliveira, R. J. Cintra, F. M. Bayer, S. Kulasekera, and A. Madanayake. A discrete Tchebichef transform approximation for image and video coding. IEEE Signal Processing Letters, 22(8):1137-1141, January 2015. [ bib | DOI ]
[5] C. J. Tablada, F. M. Bayer, and R. J. Cintra. A class of DCT approximations based on the Feig-Winograd algorithm. Signal Processing, 113:38-51, 2015. [ bib | DOI ]
[6] R. J. Cintra, L. C. Rêgo, G. M. Cordeiro, and A. D. C. Nascimento. Beta generalized normal distribution with an application for SAR image processing. Statistics, 48(2):279-294, December 2014. [ bib | DOI ]
[7] 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. [ bib | DOI ]
[8] 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, October 2014. [ bib | DOI ]
[9] 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. [ bib | DOI ]
[10] 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, August 2014. [ bib | DOI ]
[11] 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, 61(7):1984-1993, July 2014. [ bib | DOI ]
[12] R. J. Cintra, F. M. Bayer, and C. J. Tablada. Low-complexity 8-point DCT approximations based on integer functions. Signal Processing, 99:201-214, June 2014. [ bib | DOI ]
[13] 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. IEEE Transactions on Circuits and Systems I, 61(6):1727-1740, June 2014. [ bib | DOI ]
[14] N. Rajapaksha, A. Madanayake, R. J. Cintra, J. Adikari, and V. Dimitrov. VLSI computational architectures for the arithmetic cosine transform. IEEE Transactions on Computers, 2014. [ bib | DOI ]
[15] 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. [ bib | DOI ]
[16] 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. [ bib | DOI ]
[17] L. C. Rêgo and R. J. Cintra. An extension of the Dirichlet density for sets of Gaussian integers. Canadian Mathematical Bulletin, 56:161-172, March 2013. [ bib | DOI ]
[18] 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, 2013. [ bib | DOI ]
[19] A. Edirisuriya, A. Madanayake, R. J. Cintra, V. S. Dimitrov, and N. T. Rajapaksha. 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, 2013. [ bib | DOI ]
[20] 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, 2013. [ bib | DOI ]
[21] 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 and Remote Sensing, 7(2):648-663, 2013. [ bib | DOI ]
[22] 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. [ bib | DOI ]
[23] 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, November 2012. [ bib | DOI ]
[24] 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. [ bib | DOI ]
[25] 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. [ bib | DOI ]
[26] 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 2012. [ bib | DOI ]
[27] A. Madanayake, R. J. Cintra, N. Rajapaksha, V. S. Dimitrov, D. Onen, L. T. Bruton, and A. Edirisuriya. A row parallel 8×8 2D DCT architecture using algebraic integer based exact arithmetic. IEEE Transactions on Circuits and Systems for Video Technology, 22(6):915-929, June 2012. [ bib | DOI ]
[28] 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 2012. [ bib | DOI ]
[29] F. M. Bayer and R. J. Cintra. DCT-like transform for image compression requires 14 additions only. Electronics Letters, 48(15):919-921, 2012. [ bib | DOI ]
[30] 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, 2012. [ bib | DOI ]
[31] 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, 2012. [ bib | DOI ]
[32] 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, 2012. [ bib | DOI ]
[33] R. J. Cintra and F. M. Bayer. A DCT approximation for image compression. IEEE Signal Processing Letters, 18(10):579-582, October 2011. [ bib | DOI ]
[34] 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. [ bib | DOI ]
[35] 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. [ bib | .pdf ]
[36] R. J. Cintra. An integer approximation method for discrete sinusoidal transforms. Circuits, Systems, and Signal Processing, 30(6):1481-1501, 2011. [ bib | DOI ]
[37] F. M. Bayer and R. J. Cintra. Image compression via a fast DCT approximation. IEEE Latin America Transactions, 8(6):708-713, December 2010. [ bib | DOI ]
[38] A. D. C. Nascimento, R. J. Cintra, and A. C. Frery. Hypothesis testing in speckled data with stochastic distances. IEEE Transactions on Geoscience and Remote Sensing, 48(1):373-385, August 2010. [ bib | DOI ]
[39] 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 2010. [ bib | DOI ]
[40] 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. [ bib | DOI ]
[41] R. J. Cintra and T. Cooklev. Robust image watermarking using non-regular wavelets. Signal, Image and Video Processing, 3:241-250, 2009. [ bib | DOI ]
[42] 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, 2006. [ bib | DOI ]
[43] 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. [ bib | .pdf ]
[44] 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, September 2004. [ bib | DOI ]
[45] R. J. Cintra and H. M. Oliveira. A short survey on arithmetic transforms. Journal of Communication and Information Systems, 19(2):68-79, August 2004. ISSN: 1980-6604. [ bib | http ]
[46] 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. [ bib | DOI ]

Selected Conference Papers

[1] Sunera Kulasekera, Arjuna Madanayake, Renato J. Cintra, Fábio M. Bayer, and Uma Potluri. Low-complexity multiplierless DCT approximations for low-power HEVC digital IP cores. In Donnie Self, Matthew F. Pellechia, Kannappan Palaniappan, Shiloh L. Dockstader, Paul B. Deignan, and Peter J. Doucette, editors, Proceedings of the SPIE Defense + Security, volume 9089, Baltimore, MD, June 2014. [ bib | DOI ]
[2] 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. In Proceeding Series of the Brazilian Society of Computational and Applied Mathematics, volume 2, 2014. [ bib | DOI ]
[3] H. M. Oliveira, R. J. Cintra, and R. C. Oliveira. Uma representação Kotel'nikov para wavelets e bancos de filtros sem superposição espectral. In Anais do Simpósio Brasileiro de Telecomunicações, Fortaleza, Brazil, September 2013. [ bib | DOI ]
[4] R. S. Oliveira, R. J. Cintra, F. M. Bayer, and C. J. Tablada. Uma aproximação ortogonal para a DCT. In Anais do Simpósio Brasileiro de Telecomunicações, Fortaleza, Brazil, September 2013. [ bib | DOI ]
[5] C. J. Tablada, F. M. Bayer, and R. J. Cintra. Duas aproximações para a DCT baseadas na fatoração de Chen. In Anais do Simpósio Brasileiro de Telecomunicações, Fortaleza, Brazil, September 2013. [ bib | DOI ]
[6] 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 codecs. In Proceedings of the 2012 IEEE 27-th Convention of Electrical and Electronics Engineers in Israel, pages 1-5, Eilat, Israel, November 2012. [ bib | DOI ]
[7] 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. In Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS), pages 1484-1487, Seoul, Korea, May 2012. [ bib | DOI ]
[8] J. Adikari, V. S. Dimitrov, and R. J. Cintra. A new algorithm for double scalar multiplication over Koblitz curves. In Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS), pages 709-712, 2011. [ bib | DOI ]
[9] H. P. L. Arjuna Madanayake, R. J. Cintra, D. Onen, V. S. Dimitrov, and L. Bruton. Algebraic integer based 8×8 2-D DCT architecture for digital video processing. In Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS), pages 1247-1250, Rio de Janeiro, RJ, 2011. [ bib | DOI ]
[10] A. C. Frery, A. D. C. Nascimento, and R. J. Cintra. Contrast in speckled imagery with stochastic distances. In Proceedings of 2010 IEEE 17th International Conference on Image Processing, pages 69-72, Hong Kong, September 2010. [ bib | DOI ]
[11] A. D. C. Nascimento, R. J. Cintra, and A. C. Frery. Measuring synthetic aperture radar target differences with stochastic distances. In Proceedings of the IEEE Toronto International Science and Technology for Humanity (TIC-STH) Conference, pages 587-592, Toronto, ON, September 2009. [ bib | DOI ]
[12] A. D. C. Nascimento, R. J. Cintra, and A. C. Frery. Stochastic distances and hypothesis testing in speckled data. In Anais do XIV Simpósio Brasileiro de Sensoriamento Remoto (Proceedings of the XIV Brazilian Symposium on Remote Sensing), pages 7353-7360, Natal, Brazil, April 2009. INPE. [ bib | .pdf ]
[13] A. D. C. Nascimento, A. C. Frery, and R. J. Cintra. Analysis of speckled imagery with parametric and nonparametric tests. In Proceedings of the XXII Brazilian Symposium on Computer Graphics and Image Processing, Rio de Janeiro, Brazil, 2009. [ bib | .pdf ]
[14] L. R. Soares, H. M. Oliveira, and R. J. Cintra. Applications of non-orthogonal filter banks to signal and image analysis. In Proceedings of the IEEE/PES Transmission & Distribution Conference and Exposition: Latin America TDC '06, pages 1-6, Caracas, August 2006. [ bib | DOI ]
[15] L. R. Soares, H. M. Oliveira, and R. J. Cintra. Signal analysis using Fourier-like wavelets. In Proceedings of the IEEE/PES Transmission & Distribution Conference and Exposition: Latin America TDC '06, pages 1-6, August 2006. [ bib | DOI ]
[16] 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. [ bib | DOI ]
[17] 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, May 2004. [ bib | DOI ]
[18] 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 '02), volume 4, pages IV-4169, August 2002. [ bib | DOI ]