Efficient hybrid DCT-domain algorithm for video spatial downscaling
Nuno Roma,Leonel Sousa +1 more
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TLDR
Experimental results have shown that the proposed video downscaling algorithm provides significant advantages over the usual DCT decimation approaches, both in terms of the involved computational cost, the output video quality, and the resulting bit rate.Abstract:
A highly efficient video downscaling algorithm for any arbitrary integer scaling factor performed in a hybrid pixel transform domain is proposed. This algorithm receives the encoded DCT coefficient blocks of the input video sequence and efficiently computes the DCT coefficients of the scaled video stream. The involved steps are properly tailored so that all operations are performed using the encoding standard block structure, independently of the adopted scaling factor. As a result, the proposed algorithm offers a significant optimization of the computational cost without compromising the output video quality, by taking into account the scaling mechanism and by restricting the involved operations in order to avoid useless computations. In order to meet any system needs, an optional and possible combination of the presented algorithm with high-order AC frequency DCT coefficients discarding techniques is also proposed, providing a flexible and often required complexity scalability feature and giving rise to an adaptable tradeoff between the involved scalable computational cost and the resulting video quality and bit rate. Experimental results have shown that the proposed algorithm provides significant advantages over the usual DCT decimation approaches, both in terms of the involved computational cost, the output video quality, and the resulting bit rate. Such advantages are even more significant for scaling factors other than integer powers of 2 and may lead to quite high PSNR gains.read more
Citations
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Journal ArticleDOI
A DCT Approximation for Image Compression
Renato J. Cintra,Fábio M. Bayer +1 more
TL;DR: An orthogonal approximation for the 8-point discrete cosine transform (DCT) is introduced, and could outperform state-of-the-art algorithms in low and high image compression scenarios, exhibiting at the same time a comparable computational complexity.
Journal ArticleDOI
Improved 8-Point Approximate DCT for Image and Video Compression Requiring Only 14 Additions
Uma Potluri,Arjuna Madanayake,Renato J. Cintra,Fábio M. Bayer,Sunera Kulasekera,Amila Edirisuriya +5 more
TL;DR: A novel 8-point DCT approximation that requires only 14 addition operations and no multiplications is introduced and is compared to state-of-the-art DCT approximations in terms of both algorithm complexity and peak signal-to-noise ratio.
Journal ArticleDOI
Improved 8-point Approximate DCT for Image and Video Compression Requiring Only 14 Additions
Uma Potluri,Arjuna Madanayake,Renato J. Cintra,Fábio M. Bayer,Sunera Kulasekera,Amila Edirisuriya +5 more
TL;DR: In this article, the authors proposed an 8-point DCT approximation that requires only 14 addition operations and no multiplications, compared to state-of-the-art DCT approximations in terms of both algorithm complexity and peak signal-to-noise ratio.
Journal ArticleDOI
Low-complexity 8-point DCT approximations based on integer functions
TL;DR: This paper proposes a collection of twelve approximations for the 8-point DCT based on integer functions that are suitable for hardware implementation in dedicated architectures and assessed in the context of JPEG-like image compression.
Journal ArticleDOI
Low-Power VLSI Architectures for DCT\/DWT: Precision vs Approximation for HD Video, Biomedical, and Smart Antenna Applications
Arjuna Madanayake,Renato J. Cintra,Vassil S. Dimitrov,Fábio M. Bayer,Khan A. Wahid,Sunera Kulasekera,Amila Edirisuriya,Uma Potluri,Shiva Madishetty,Nilanka Rajapaksha +9 more
TL;DR: The methods discussed in the paper can be used in the design of emerging low-power digital systems having lowest complexity at the cost of a loss in accuracy?the optimal trade-off of computational accuracy for lowest possible complexity and power.
References
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