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检索条件"主题词=scalable video coding"

共 1539 条记录，以下是271-280 订阅

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A HIERARCHICAL MOTION SMOOTHING FOR DISTRIBUTED scalable video coding

A HIERARCHICAL MOTION SMOOTHING FOR DISTRIBUTED SCALABLE VID...

引用

29th Picture coding Symposium (PCS)

作者： Sakomizu, Kazuhito Nishi, Takashi Onoye, Takao Oki Elect Ind Co Ltd Corp Res & Dev Ctr Chuo Ku Osaka 5410053 Japan Osaka Univ Dept Informat Syst Engn Osaka 5650871 Japan

ISBN: (纸本)9781457720482

This paper proposes a method to improve the coding efficiency of the distributed video coding based on a scalable encoder/ decoder without feedback link. The proposed method performs a hierarchical motion smoothing to enable accurate rate control. Specifically, reflecting motion information on a coding rate, the encoder can estimate code amount which satisfies the decoder's need. In addition, side information generation based on the hierarchical motion smoothing is proposed for further quality improvement. Experimental results show that the proposed method increases the PSNR-Y by 1.2 dB at 500 kbps in comparison with a block matching based method. Moreover the number of repeat operations to calculate cost value for side information generation can be reduced by 10 times from the conventional method, which demonstrates the practicability of the proposed method.

关键词： scalable video coding

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Fast Mode Decision Algorithm. for B-Picture in Full scalable video coding Using Coded Block Pattern

Fast Mode Decision Algorithm. for B-Picture in Full Scalable...

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IEEE International Conference on Consumer Electronics (ICCE)

作者： Kim, Tae-Jung Yoo, Hyang-Mi Suh, Jae-Won Chungbuk Natl Univ Chonju South Korea

ISBN: (纸本)9781457702310

To provide network friendly scalability, scalable video coding (SVC) has been finalized as an H. 264/AVC scalable extension. Because SVC supports a inter layer prediction scheme to determine the best coding mode in an enhancement layer, it achieves high coding efficiency but increases computational complexity. To reduce the computational complexity, we propose a fast and efficient mode decision scheme for enhancement layer using the coded block pattern for 16x16 mode of the current and previous pictures. Experimental results show that the proposed algorithm reduces the processing time about 41.30% with negligible loss in coding efficiency.

关键词： scalable video coding

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Multiple Description coding for scalable video coding with Redundant Slice

Multiple Description Coding for Scalable Video Coding with R...

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18th IEEE International Conference on Networks (ICON)

作者： Lin, Chunyu Zhao, Yao Bai, Huihui Goh, Kwong Huang Beijing Jiaotong Univ Inst Informat Sci Beijing Key Lab Adv Informat Sci & Network Beijing Peoples R China ASTAR Signal Proc Dept Inst Infocomm Res Singapore Singapore

ISBN: (纸本)9781467345231;9781467345217

scalable video coding(SVC) is designed to provide adaptable capability for heterogeneous network structures with its scalabilities. Due to the introducing of inter-layer prediction, SVC coded bitstream is much vulnerable to the channel error. To solve this problem, a lot of schemes are proposed. However, they are either not compatible with the standard or just focus on one of scalabilities in SVC. In this paper, we propose a multiple description scheme that is compatible with SVC standard and supports all the scalabilities. The proposed scheme is based on the redundant slice in the SVC standard, in which each layer is composed of primary slice and redundant slice by interleaving. To deal with the mismatch error and propagated error, the quantization step of redundant slice and the mode of each macroblock is tuned by considering the prediction path in the same layer and between different layers, as well as the channel packet loss rate. The experimental results show that the proposed scheme is efficient for the packet loss channel.

关键词： scalable video coding Multiple description coding Redundant slice

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Performance Comparison of the SVC, WSVC, and Motion JPEG2000 Advanced scalable video coding Schemes

Performance Comparison of the SVC, WSVC, and Motion JPEG2000...

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IET Intelligent Signal Processing Conference

作者： Xin Lu Graham. R. Martin Xuesong Jin Department of Computer Science University of Warwick School of Electronics and Information Engineering Harbin Institute of Technology

ISBN: (纸本)9781629938431

Three scalable video coding algorithms have been standardised in recent years. SVC, the scalable extension of H.264/AVC, is the most recent international standard;Motion JPEG2000 is part 3 of the image coding standard JPEG2000;and Wavelet-based SVC (WSVC) is a strong competitor in the scalable video coding field. All three of the video coding algorithms have been designed to produce scalable video bitstreams. In this paper, we investigate the difference between each coding algorithm and perform a comparative study of the coding efficiency for high quality video coding using SVC, WSVC and Motion JPEG2000. Empirical evaluation results show that the optimal choice among the three coding schemes relies on the application scenario. In particular, WSVC provides the best coding performance among the three coding algorithms. The performance of SVC and Motion JPEG2000 depends on the resolution of coded video sequences. In addition, the spatial scalability of SVC and WSVC is also investigated in the evaluation. This appears to be the first time in the literature that the performance of spatial scalability is evaluated.

关键词： Static VAr compensators JPEG scalable video scalable video coding

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TOWARDS PREDICTOR, QUANTIZER AND ENTROPY CODER OPTIMALITY IN scalable video coding

TOWARDS PREDICTOR, QUANTIZER AND ENTROPY CODER OPTIMALITY IN...

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19th IEEE International Conference on Image Processing (ICIP)

作者： Han, Jingning Rose, Kenneth Univ Calif Santa Barbara Dept Elect & Comp Engn Santa Barbara CA 93106 USA

ISBN: (纸本)9781467325332;9781467325349

A novel coding paradigm is proposed to jointly optimize the prediction, quantization, and entropy coding modules, thereby approaching optimality in scalable video coding. It departs from conventional video coding schemes that consider prediction, transformation, quantization, and entropy coding, as largely separate sequential functional components. The method draws inspiration from an early estimation-theoretic approach, developed by our group for enhancement layer prediction, which efficiently combines all the information available to the enhancement layer coder, to produce the optimal prediction. The framework is significantly expanded here to also incorporate optimization of entropy-constrained quantization and arithmetic coding, while fully accounting for hitherto ignored relevant factors, inherent to predictive scalable coding, including information from the base layer quantization operation, and from the enhancement layer motion compensated reference. Experimental evidence is provided for substantial coding gains over conventional scalable video coding.

关键词： scalable video coding estimation-theoretic framework entropy-constrained quantization CABAC

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USING scalable video coding FOR DYNAMIC ADAPTIVE STREAMING OVER HTTP IN MOBILE ENVIRONMENTS

USING SCALABLE VIDEO CODING FOR DYNAMIC ADAPTIVE STREAMING O...

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20th European Signal Processing Conference (EUSIPCO)

作者： Mueller, Christopher Renzi, Daniele Lederer, Stefan Battista, Stefano Timmerer, Christian Alpen Adria Univ Klagenfurt Univ Str 65-67 A-9020 Klagenfurt Austria bSoft ltd I-62100 Macerata Italy

ISBN: (纸本)9781467310680

Dynamic Adaptive Streaming over HTTP (DASH) is a convenient approach to transfer videos in an adaptive and dynamic way to the user. As a consequence, this system provides high bandwidth flexibility and is especially suitable for mobile use cases where the bandwidth variations are tremendous. In this paper we have integrated the scalable video coding (SVC) extensions of the Advanced video coding (AVC) standard into the recently ratified MPEG-DASH standard. Furthermore, we have evaluated our solution under restricted conditions using bandwidth traces from mobile environments and compared it with an improved version of our MPEG-DASH implementation using AVC as well as major industry solutions.

关键词： Dynamic Adaptive Streaming over HTTP MPEG-DASH scalable video coding Evaluation Mobile Networks Vehicular Mobility

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A HIERARCHICAL MODE DECISION SCHEME FOR FAST IMPLEMENTATION OF SPATIALLY scalable video coding

A HIERARCHICAL MODE DECISION SCHEME FOR FAST IMPLEMENTATION ...

引用

IEEE Visual Communications and Image Processing (VCIP)

作者： Lu, Xin Martin, Graham R. Univ Warwick Dept Comp Sci Coventry CV4 7AL W Midlands England

ISBN: (纸本)9781467344050;9781467344067

In order to improve coding efficiency, a new inter-layer prediction mechanism is incorporated in the SVC extension of H.264/AVC. This utilizes information from the base layer to inform the process of coding the enhancement layer. However this increases the computational requirement. A fast mode decision algorithm that exploits the correlation of a macroblock in the enhancement layer and both the corresponding macroblock in the base layer and neighbouring macroblocks, is proposed. The algorithm also assesses the homogeneity of the picture content and uses the mode information of the base layer to make faster mode selections in the enhancement layer. The fact that larger partition sizes are more suitable for homogeneous regions, and vice versa, is also exploited. Empirical evaluation of the proposed algorithm shows that, for similar rate distortion performance, encoding time is reduced by up to 84% compared with the JSVM9.18 software implementation.

关键词： Fast mode decision Inter-layer prediction Mode correlation scalable video coding

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USING OVERLAPPING SUBJECTIVE DATASETS TO ASSESS THE PERFORMANCE OF OBJECTIVE QUALITY METRICS ON scalable video coding AND ERROR CONCEALMENT

USING OVERLAPPING SUBJECTIVE DATASETS TO ASSESS THE PERFORMA...

引用

4th International Workshop on Quality of Multimedia Experience (QoMEX)

作者： Pitrey, Y. Pepion, R. Le Callet, P. Barkowsky, M. Univ Vienna Vienna Austria Univ Nantes IRCCyN UMR CNRS 6597 LUNAM Nantes France

ISBN: (纸本)9781467307253

In this paper, four subjective video datasets are presented. The considered application is scalable video coding used as an error-concealment mechanism. The presented datasets explore the relations between encoding parameters and perceived quality, under different network-impairment patterns and involve error-concealment on the decoder's side, to simulate a complete distribution channel. The datasets share a part of common configurations which enables, in the first part of the paper, to compare the outcomes from several Single Stimulus experiments and draw interesting correspondances between different types of distortion. In the second part of the paper, we analyse the performance of three common objective quality metrics on each step of the distribution channel, to identify the possible directions to be followed in order to improve their accuracy in predicting the perceived quality.

关键词： Subjective video databases video quality metrics Inter-experiment alignment scalable video coding Error-concealment Packet-loss Source characteristics

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Influence of the Source Content and Encoding Configuration on the Perceived Quality for scalable video coding

Influence of the Source Content and Encoding Configuration o...

引用

Conference on Human Vision and Electronic Imaging XVII

作者： Pitrey, Yohann Barkowsky, Marcus Pepion, Romuald Le Callet, Patrick Hlavacs, Helmut Univ Vienna A-1010 Vienna Austria LUNAM Univ Nantes CNRS 6597 IRCCyN UMR Nantes France

ISBN: (纸本)9780819489388

In video coding, it is commonly accepted that the encoding parameters such as the quantization step-size have an influence on the perceived quality. It is also sometimes accepted that using given encoding parameters, the perceived quality does not change significantly according to the encoded source content. In this paper, we present the outcomes of two video subjective quality assessment experiments in the context of scalable video coding. We encoded a large set of video sequences under a group of constant quality scenarios based on two spatially scalable layers. One first experiment explores of the relation between a wide range of quantization parameters for each layer and the perceived quality, while the second experiment uses a subset of the encoding scenarios on a large number of video sequences. The two experiments are aligned on a common scale using a set of shared processed video sequences, resulting in a database containing the subjective scores for 60 different sources combined with 20 SVC scenarios. We propose a detailed analysis of the experimental results of the two experiments, bringing a clear insight of the relation between the encoding parameters combination of the scalable layers and the perceived quality, as well as spreading light on the differences in terms of quality depending on the encoded source content. As an endeavour to analyse these differences, we propose a classification of the sources with regards to their relative behaviour when compared to the average of other source contents. We use this classification to identify potential factors to explain the differences between source contents.

关键词： source content video quality assessment scalable video coding

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Spatially scalable video coding for HEVC

Spatially scalable video coding for HEVC

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2012 13th IEEE International Conference on Multimedia and Expo, ICME 2012

作者： Shi, Zhongbo Sun, Xiaoyan Wu, Feng University of Science and Technology of China Hefei Anhui China Microsoft Research Asia Beijing China

ISBN: (纸本)9781467316590

Spatially scalable video coding (SSVC in short) provides an efficient way to deliver one video at different resolutions. Based on the development of emerging High Efficiency video coding (HEVC), we propose a SSVC scheme to provide both single-loop and multi-loop solutions by enabling different inter-layer prediction mechanisms. Specifically, there are three basic inter-layer prediction modes, inter-layer intra, motion and residual prediction, which are first investigated for enhancement layer coding. These three modes provide a basic single-loop SSVC solution for low complexity applications. Beside the correlations explored in single-loop solution, we employ an extra patch learning-based prediction mode named P-mode to further improve coding performance. In P-mode, the temporal and spatial correlations of the reference frames are explored simultaneously by the visual patch-based learning and mapping at pixel level. These correlations help enhance the accuracy of the inter-layer frame prediction from the base-layer reconstruction within a multi-loop structure. The experimental results show the effectiveness of the proposed SSVC scheme compared with simulcast case. © 2012 IEEE.

关键词： scalable video coding

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