163 citations · 1.5k across the 72 of their papers we have counts for
4 papers · 2 filters
On a Density for Sets of Integers
R. J. Cintra, L. C. Rêgo, H. M. de Oliveira +1
A relationship between the Riemann zeta function and a density on integer sets is explored. Several properties of the examined density are derived.
A Class of DCT Approximations Based on the Feig-Winograd Algorithm
C. J. Tablada, F. M. Bayer, R. J. Cintra
A new class of matrices based on a parametrization of the Feig-Winograd factorization of 8-point DCT is proposed. Such parametrization induces a matrix subspace, which unifies a nu…
A Discrete Tchebichef Transform Approximation for Image and Video Coding
P. A. M. Oliveira, R. J. Cintra, F. M. Bayer +2
In this paper, we introduce a low-complexity approximation for the discrete Tchebichef transform (DTT). The proposed forward and inverse transforms are multiplication-free and requ…
Multi-Beam RF Aperture Using Multiplierless FFT Approximation
D. Suarez, R. J. Cintra, F. M. Bayer +3
Multiple independent radio frequency (RF) beams find applications in communications, radio astronomy, radar, and microwave imaging. An -point FFT applied spatially across an arr…