R
Raíza S. Oliveira
Researcher at Federal University of Pernambuco
Publications - 8
Citations - 94
Raíza S. Oliveira is an academic researcher from Federal University of Pernambuco. The author has contributed to research in topics: Discrete cosine transform & Image compression. The author has an hindex of 5, co-authored 7 publications receiving 63 citations. Previous affiliations of Raíza S. Oliveira include University of Akron.
Papers
More filters
Journal ArticleDOI
Low-complexity 8-point DCT approximation based on angle similarity for image and video coding
Raíza S. Oliveira,Renato J. Cintra,Fábio M. Bayer,Thiago L. T. da Silveira,Arjuna Madanayake,André Leite +5 more
TL;DR: In this article, the authors proposed a method to derive computationally efficient approximations to the discrete cosine transform (DCT) by minimizing the angle between the rows of the exact DCT matrix and the columns of the approximated transformation matrix.
Journal ArticleDOI
Multiplierless 16-point DCT approximation for low-complexity image and video coding
Thiago L. T. da Silveira,Raíza S. Oliveira,Raíza S. Oliveira,Fábio M. Bayer,Renato J. Cintra,Arjuna Madanayake +5 more
TL;DR: An orthogonal 16-point approximate discrete cosine transform (DCT) is introduced, requiring neither multiplications nor bit-shifting operations and requiring only 44 additions—the lowest arithmetic cost in literature.
Journal ArticleDOI
Low-Complexity Loeffler DCT Approximations for Image and Video Coding
Diego F. G. Coelho,Renato J. Cintra,Fábio M. Bayer,Sunera Kulasekera,Arjuna Madanayake,Paulo Martinez,Thiago L. T. da Silveira,Raíza S. Oliveira,Vassil S. Dimitrov +8 more
TL;DR: This paper introduced a matrix parametrization method based on the Loeffler discrete cosine transform (DCT) algorithm, capable of unifying the mathematical formalism of several 8-point DCT approximations archived in the literature.
Journal ArticleDOI
Low-complexity 8-point DCT Approximation Based on Angle Similarity for Image and Video Coding
Raíza S. Oliveira,Renato J. Cintra,Fábio M. Bayer,T. L. T. da Silveira,Arjuna Madanayake,André Leite +5 more
TL;DR: In this paper, the authors proposed a method to derive computationally efficient approximations to the discrete cosine transform (DCT) by minimizing the angle between the rows of the exact DCT matrix and the columns of the approximated transformation matrix.
Journal ArticleDOI
Pruned Discrete Tchebichef Transform Approximation for Image Compression
Vitor A. Coutinho,Renato J. Cintra,Renato J. Cintra,Fábio M. Bayer,Paulo A. M. Oliveira,Raíza S. Oliveira,Arjuna Madanayake +6 more
TL;DR: This work proposed a set of low-complexity pruned DTT approximations suitable for low-power embedded systems, obtained by pruning the state-of-art DTT approximation, being applicable in the image and video coding context.