Multimedia applications are ubiquitous in daily life. To satisfy multiple requests equipped with different devices and bandwidths, scalable video coding has been developed. However, it is difficult to realise spatial ...
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Multimedia applications are ubiquitous in daily life. To satisfy multiple requests equipped with different devices and bandwidths, scalable video coding has been developed. However, it is difficult to realise spatial and quality scalabilities in practice owing to the increased coding complexity brought by inter-layer prediction. A novel fast mode decision algorithm for spatial scalable video coding is proposed in which macroblock modes in the base layer and the enhancement layer are predicted from each other. The experimental results show that the proposed algorithm provides up to 74% of time saving with ignorable quality degradation and acceptable bit rate increase.
The scalable video coding is an effective solution to fulfil the different requirements in modern video transmission system. Though the coding efficiency is high, the computational complexity is expensive. This paper ...
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ISBN:
(纸本)9781612843490
The scalable video coding is an effective solution to fulfil the different requirements in modern video transmission system. Though the coding efficiency is high, the computational complexity is expensive. This paper presents a proposed algorithm to reduce the encoding time of enhancement layer through probability analysis. Firstly two classes are defined, and the Bayes Classifier decides whether the current macroblock belongs to Big Block class or Small Block class. Then an early termination strategy is checked for ignoring some inter modes. When inter-layer residual prediction is used, the optimal inter mode is set as the best inter mode of co-located macroblock in base layer. For the intra modes, the INTRA_16x16 is skipped based on statistical data. Experiment results show that the proposed algorithm reduces computational complexity with negligible video quality loss and bit rate increment when compared with reference software and other methods.
Intra coding in H.264/AVC has significantly enhanced video compression efficiency. However, computation complexity increases by the rate-distortion (RD) based modedecision. This paper proposes a novel fastmode decis...
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Intra coding in H.264/AVC has significantly enhanced video compression efficiency. However, computation complexity increases by the rate-distortion (RD) based modedecision. This paper proposes a novel fast mode decision algorithm in H.264/AVC intra prediction and its VLSI architecture. A novel edge-detection pattern is proposed and both edge-detection technique and spatial mode prediction technique are combined together to reduce the number of intra 4 x 4 candidate modes from 9 to an average of 2.50. VLSI architecture of intra modedecision module is designed with TSMC 0.18 mu m CMOS technology. The maximum frequency of 285 MHz is achieved and 13.1k NAND gates are required. High frequency, efficient processing cycle reduction and small area make this design to be an excellent accelerator for HDTV 1080p@30 fps real time encoder.
Multi-view video coding with a hierarchical B picture structure utilises intra-view and inter-view predictions to reduce the quantity of redundant information. The optimal coding mode is determined by exhaustively sea...
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Multi-view video coding with a hierarchical B picture structure utilises intra-view and inter-view predictions to reduce the quantity of redundant information. The optimal coding mode is determined by exhaustively searching through all possible partition modes;however, a high degree of computational complexity is involved in such exhaustive searches. In this study, the authors statistically analyse the coding mode distribution in inter-view and intra-view and propose a fast mode decision algorithm to select the optimal mode in terms of rate-distortion optimisation. The probability density function of the rate-distortion cost and the degree of the homogeneity in motion are set as the multi-threshold in the algorithm to determine the optimal mode for base view coding. For the multi-view coding, the correlation of the modes in neighbouring views with similar regions is utilised to select the coding mode from the inter-view or intra-view predictions. The experimental results show that the encoding time for the base view and the multi-view is reduced by up to 85 and 69%, respectively, and the quality of the reconstructed video is nearly unchanged.
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