163 citations · 1.5k across the 72 of their papers we have counts for
11 papers · 1 filter
Block-Parallel Systolic-Array Architecture for 2-D NTT-based Fragile Watermark Embedding
H. P. L. Arjuna Madanayake, R. J. Cintra, V. S. Dimitrov +1
Number-theoretic transforms (NTTs) have been applied in the fragile watermarking of digital images. A block-parallel systolic-array architecture is proposed for watermarking based…
A Digital Hardware Fast Algorithm and FPGA-based Prototype for a Novel 16-point Approximate DCT for Image Compression Applications
F. M. Bayer, R. J. Cintra, A. Edirisuriya +1
The discrete cosine transform (DCT) is the key step in many image and video coding standards. The 8-point DCT is an important special case, possessing several low-complexity approx…
DCT-like Transform for Image Compression Requires 14 Additions Only
F. M. Bayer, R. J. Cintra
A low-complexity 8-point orthogonal approximate DCT is introduced. The proposed transform requires no multiplications or bit-shift operations. The derived fast algorithm requires o…
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…
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…
Fragile Watermarking Using Finite Field Trigonometrical Transforms
R. J. Cintra, V. S. Dimitrov, H. M. de Oliveira +1
Fragile digital watermarking has been applied for authentication and alteration detection in images. Utilizing the cosine and Hartley transforms over finite fields, a new transform…
Improved 8-point Approximate DCT for Image and Video Compression Requiring Only 14 Additions
U. S. Potluri, A. Madanayake, R. J. Cintra +3
Video processing systems such as HEVC requiring low energy consumption needed for the multimedia market has lead to extensive development in fast algorithms for the efficient appro…
A DCT Approximation for Image Compression
R. J. Cintra, F. M. Bayer
An orthogonal approximation for the 8-point discrete cosine transform (DCT) is introduced. The proposed transformation matrix contains only zeros and ones; multiplications and bit-…
A Multiplierless Pruned DCT-like Transformation for Image and Video Compression that Requires 10 Additions Only
V. A. Coutinho, R. J. Cintra, F. M. Bayer +2
A multiplierless pruned approximate 8-point discrete cosine transform (DCT) requiring only 10 additions is introduced. The proposed algorithm was assessed in image and video compre…