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- Renato J. Cintra, Fábio M. Bayer
- IEEE Signal Processing Letters
- 2011

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-shift operations are absent. Close spectral behavior relative to the DCT was adopted as design criterion. The proposed algorithm is superior to the signed discrete cosine… (More)

- Abraao D. C. Nascimento, Renato J. Cintra, Alejandro César Frery
- IEEE Trans. Geoscience and Remote Sensing
- 2010

Images obtained with coherent illumination, as is the case of sonar, ultrasound-B, laser and Synthetic Aperture Radar – SAR, are affected by speckle noise which reduces the ability to extract information from the data. Specialized techniques are required to deal with such imagery, which has been modeled by the G distribution and under which regions with… (More)

- Uma Sadhvi Potluri, Arjuna Madanayake, Renato J. Cintra, Fábio M. Bayer, Sunera Kulasekera, Amila Edirisuriya
- IEEE Trans. on Circuits and Systems
- 2014

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 approximation of 2-D DCT transforms. The DCT is employed in a multitude of compression standards due to its remarkable energy compaction properties. Multiplier-free approximate DCT… (More)

- Fábio M. Bayer, Renato J. Cintra
- ArXiv
- 2017

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 only 14 additions, less than any existing DCT approximation. Moreover, in several image compression scenarios, the proposed transform could outperform the well-known signed DCT, as… (More)

- Renato J. Cintra
- CSSP
- 2011

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 approximations widely investigated. However, 16-point DCT transform has energy compaction advantages. In this sense, this paper presents a new 16-point DCT approximation with null… (More)

Two multiplierless algorithms are proposed for 4×4 approximate-DCT for transform coding in digital video. Computational architectures for 1-D/2-D realisations are implemented using Xilinx FPGA devices. CMOS synthesis at the 45 nm node indicate real-time operation at 1 GHz yielding 4×4 block rates of 125 MHz at less than 120 mW of dynamic power consumption.

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 computational cost. A fast algorithm based on matrix factorization was proposed requiring only 60 additions. The proposed architecture outperforms classical and state-of-the-art… (More)

- Shiva Madishetty, Arjuna Madanayake, Renato J. Cintra, Vassil S. Dimitrov
- IEEE Trans. on Circuits and Systems
- 2014