163 citations · 1.5k across the 72 of their papers we have counts for
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Low-complexity Pruned 8-point DCT Approximations for Image Encoding
V. A. Coutinho, R. J. Cintra, F. M. Bayer +2
Two multiplierless pruned 8-point discrete cosine transform (DCT) approximation are presented. Both transforms present lower arithmetic complexity than state-of-the-art methods. Th…
Energy-efficient 8-point DCT Approximations: Theory and Hardware Architectures
R. J. Cintra, F. M. Bayer, V. A. Coutinho +2
Due to its remarkable energy compaction properties, the discrete cosine transform (DCT) is employed in a multitude of compression standards, such as JPEG and H.265/HEVC. Several lo…
Low-complexity Image and Video Coding Based on an Approximate Discrete Tchebichef Transform
P. A. M. Oliveira, R. J. Cintra, F. M. Bayer +3
The usage of linear transformations has great relevance for data decorrelation applications, like image and video compression. In that sense, the discrete Tchebichef transform (DTT…
Multiplierless 16-point DCT Approximation for Low-complexity Image and Video Coding
T. L. T. Silveira, R. S. Oliveira, F. M. Bayer +2
An orthogonal 16-point approximate discrete cosine transform (DCT) is introduced. The proposed transform requires neither multiplications nor bit-shifting operations. A fast algori…
An Orthogonal 16-point Approximate DCT for Image and Video Compression
T. L. T. da Silveira, F. M. Bayer, R. J. Cintra +3
A low-complexity orthogonal multiplierless approximation for the 16-point discrete cosine transform (DCT) was introduced. The proposed method was designed to possess a very low com…
Robust Image Watermarking Using Non-Regular Wavelets
R. J. Cintra, T. V. Cooklev
An approach to watermarking digital images using non-regular wavelets is advanced. Non-regular transforms spread the energy in the transform domain. The proposed method leads at th…