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检索条件"主题词=Multiple Description coding"

共 417 条记录，以下是81-90 订阅

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Effect of the multiple description coding over a Hybrid Fixed-AdHoc Video Distribution Network

Effect of the Multiple Description Coding over a Hybrid Fixe...

引用

2nd International Workshop on Future Multimedia Networking

作者： Acelas, Patricia Arce, Pau Guerri, Juan C. Univ Politecn Valencia ITEAM Inst Multimedia Commun Grp Valencia 46022 Spain

ISBN: (纸本)9783642024719

Offering a real time video transmission service, using mobile ad hoc networks (MANETs) and granting a specific Quality of Service (QoS) is a hard challenge. In fact, the network topology is extremely unstable and its variability causes the loss of transmitted information. However, powerful mechanisms against channel failures can be incorporated to avoid the system breakdown. In this paper, we evaluate the effect of multiple description coding (MDC) technique for improving video quality in a multimedia content distribution system. The architecture proposed is a hybrid fixed and wireless ad hoc network where nodes can move freely. Due to multipoint to point nature of this system, multidescription can be combined with multipath transmission to increase its efficiency and, at last, the Quality of Experience (QoE) of the final receiver. The simulation lets us compare the quality of the video streaming paying attention to quality parameters (PSNR, packet delivery ratio, decodable frame rate and interruptions). Results show that MDC improves video quality in high mobility scenarios.

关键词： AdHoc Networks Video Streaming multiple description coding Performance Evaluation

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Bandwidth provisioning for multiple description coding based video distribution 5

Bandwidth provisioning for multiple description coding based...

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5th International Symposium on Wireless Personal Multimedia Communications

作者： Li, B Xu, J Liu, JC Li, B Cao, XR Hong Kong Univ Sci & Technol Dept Elect & Elect Engn Hong Kong Peoples R China

ISBN: (纸本)0780374428

This paper presents a formal study on the optimal layer bandwidth allocation for non-cumulative layered video or multiple description coding based broadcasting over broadband wireless networks. We first formulate the optimal bandwidth allocation problem with the objective of maximizing goodput, the total bandwidth delivered to all the receivers in a session. We show that this problem, in its most general form, is computationally intractable. We then propose three practically effective heuristic algorithms for wireless broadcast environments, namely, Merge-Based Allocation (MBA), Multi-Granular Allocation (MGA), and Cumulative Layering based Allocation (CLA). Numerical results show that all three heuristic algorithms significantly outperform non-adaptive allocation algorithms.

关键词： multiple description coding broadcasting

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On the multiple description coding Problem with One Semi-deterministic Distortion Measure

On the Multiple Description Coding Problem with One Semi-det...

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IEEE Global Telecommunications Conference (GLOBECOM)

作者： Zhou, Lin Motani, Mehul Natl Univ Singapore Dept ECE Singapore Singapore

ISBN: (纸本)9781509050192

In this paper, we revisit the multiple description coding problem with one semi-deterministic distortion measure, which we term as the Fu-Yeung problem (Fu and Yeung, 2002). We present the properties of optimal test channels for the minimum sum-rate function, a non-asymptotic converse bound and second-order asymptotics for discrete memoryless sources. Since the successive refinement problem is a special case of the Fu-Yeung problem, as a by-product, we obtain a non-asymptotic converse bound for the successive refinement problem, which turns out to be a strict generalization of the non-asymptotic converse bound for successively refinable sources (Zhou, Tan and Motani, 2017).

关键词： Lossy source coding multiple description coding Non-asymptotic converse bound Second-order asymptotics Tilted Information Density

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Polyphase downsampling based multiple description coding applied to H.264 video coding

Polyphase downsampling based multiple description coding app...

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International Technical Conference on Circuits Systems, Computers and Communication

作者： Jia, Jie Kim, Hae-Jwang Sejong Univ Dept Comp Engn Seoul 143747 South Korea Xidian Univ ISN Natl Key Lab Xian Peoples R China

This paper presents a video coding method that improves error resilient functionality of H.264 with good coding efficiency. The method is based on PD (polyphase downsampling) multiple description coding. The only changes to H.264 are inserting PD before the DCT process and having new data partitioning NAL units. A coded slice is sent on 3 data partitioning NAL units. A header NAL unit contains motion vectors and block modes. Each of the other two NAL units contains a description generated by PD multiple description coding. The experimental results on all 9 of the test sequences of JVT SVC show that the proposed method gives 0.5 to 5 dB enhancement over the existing H.264 FMO checker board mode with motion vector based error-concealment.

关键词： error resilience multiple description coding H.264 video coding polyphase downsampling

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An efficient multiple description coding scheme for the scalable extension of H.264/AVC (SVC)

An efficient multiple description coding scheme for the scal...

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6th IEEE International Symposium on Signal Processing and Information Technology

作者： Mansour, Hassan Nasiopoulos, Panos Leung, Victor Univ British Columbia Dept Elect & Comp Engn 2356 Main Mall Vancouver BC V6T 1Z4 Canada

ISBN: (纸本)9780780397538

The demand for efficient scalable video codecs has constantly been on the rise in response to the increase in the variety of services and QoS requirements in multimedia networks. Existing standardization efforts, such as the Scalable Video coding extension of the H.264/AVC standard, do not offer efficient error resilient protection for all the different levels of video enhancement. We developed a multiple description scalable video coding technique that offers complementary and independently decodable descriptions, offering acceptable video quality even if only one of them is successfully received. Performance evaluations show that our scheme delivers an average improvement of 5 dB for single channel decoding and an improvement of 2 dB on average for packet loss simulations when compared with the UXP protected SD-SVC and the multiple-description motion compensated temporal filtering (MD-MCTF) scheme at comparable redundancy levels.

关键词： multiple description coding SVC

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AN IMPROVED LOW-COMPLEXITY multiple description coding FOR PEER-TO-PEER VIDEO STREAMING

AN IMPROVED LOW-COMPLEXITY MULTIPLE DESCRIPTION CODING FOR P...

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International Conference on Multimedia and Expo

作者： Ardestani, Majid R. Shirazi, Ali Asghar Beheshti Hashemi, Mahmoud Reza Iran Univ Sci & Technol Sch Elect Engn Image Proc Lab Tehran Iran Univ Tehran Sch Elect & Comp Engn Multimedia Proc Lab Tehran Iran

ISBN: (纸本)9781424474936

multiple description scalable coding based on T+2D wavelet decomposition structure is highly flexible for peer-to-peer (P2P) video streaming. Finding the optimal truncation point of each code block (CB) within each description is an NP-hard problem. To implement an efficient low-complexity solution, we propose a simple clustering algorithm for partitioning the CBs into a limited number of clusters, such that one can find the optimal cluster-level redundancy-rate assignment matrix using a low-complexity full search. This approach improves the decoding quality compared to the co-echelon frameworks [1] [6] in which a non-optimal rate assignment matrix is used. In addition, the proposed clustering approach may be analytically represented by closed-form relations for low-complexity computation of optimal encoding parameters. The simulation results demonstrate that the adaptive proposed framework outperforms the approaches in [1] by (0.25 similar to 1dB), the scheme of [6] by (1.3 similar to 1.6dB), and the non-adaptive multiple description coding by (2.3 similar to 4.3dB). Furthermore, the proposed clustering approach requires %52-%88 less computations compared to the framework in [1].

关键词： Scalable video coding multiple description coding channel-aware redundancy-rate allocation clustering

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LOW COMPLEXITY multiple description coding FOR THE SCALABLE EXTENSION OF H.264/AVC

LOW COMPLEXITY MULTIPLE DESCRIPTION CODING FOR THE SCALABLE ...

引用

Picture coding Symposium 2009

作者： Zhao, Zhijie Ostermann, Joern Chen, Hexin Leibniz Univ Hannover Inst Informat Verarbeitung Hannover Germany Jilin Univ Coll Instrumentat & Elect Engn Changchun Peoples R China Jilin Univ Coll Commun Engn Changchun Peoples R China

ISBN: (纸本)9781424445936

In this paper, we propose a scheme for the robust transmission of video in error prone environments using multiple description coding (MDC) based on the scalable video coding extension (SVC) of H.264/AVC. Due to the layer structure of SVC, a base layer is referenced by one or more enhancement layers. The proposed method produces multiple description base layers to achieve robust video communication over unreliable channels with reasonable redundancy. Two base layers are generated using residual data downsampling, which makes it possible that the two base layers have the same motion vectors. The proposed method combines the advantages of SVC and MDC. Experimental results show that the proposed algorithm outperforms the temporal splitting based multiple description scalable coding method in terms of PSNR by 0.3 dB.

关键词： multiple description coding scalable video coding residual downsampling

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A New Robust multiple description coding Method for Image Based on Block Compressed Sensing 8

A New Robust Multiple Description Coding Method for Image Ba...

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8th International Conference on Digital Image Processing (ICDIP)

作者： Liu, Zhen Zhu, Yue-Sheng Fan, Yi Lin, Han-chi Peking Univ Shenzhen Grad Sch Inst Big Data Technol Lab Commun & Informat Secur Beijing Peoples R China

ISBN: (纸本)9781510605039;9781510605046

In this paper, a new robust multiple description image coding method with a modified interleaving sampling and a modified interpolation method using block compressed sensing is proposed. In the encoding process, the original image is decomposed into several sub-images by using the modified interleaving sampling and the redundant bits are added to enhance the reconstruction accuracy. For each sub-image the description is obtained in the block compressed sensing (BCS). In the decoding process, the signal is reconstructed from the sparse measurements by using the optimization algorithm. Our analysis and simulation results showed that the proposed method is a balanced multiple description coding scheme with higher accuracy of reconstruction and higher efficiency of coding.

关键词： Block Compressed Sensing multiple description coding modified interleaving sampling image coding

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A mesh-based multiple description coding method for network video

A mesh-based multiple description coding method for network ...

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18th International Conference on Advanced Information Networking and Applications

作者： Wang, YL Wu, CK Xidian Univ Sch Commun Engn Xian 710071 Peoples R China

ISBN: (纸本)0769520510

In this paper, we first propose a multiple description mesh-based motion coding method, which generates two descriptions for mesh-based motion by first subsampling the nodes of a right-angled triangular mesh and then dividing them into two groups. Motion vectors associated with the mesh nodes in each group form the mesh-based motion field for each description, and are transmitted over distinct network channels. With the nodes in each group, two other regular triangular meshes besides the original one can be constructed, and three different prediction images can be reconstructed according to descriptions available. The proposed multiple description mesh-based motion coding method is then combined with the pairwise correlating transform proposed in [4], and a new and complete multiple description video coding scheme is proposed. Further measures are taken to reduce the mismatch between the encoder and the decoder that occurs when the decoder receives only one of the two descriptions and has to use a different reference frame for motion compensation other than the encoder does. Simulations were carried out to evaluate the performance of the proposed scheme, and the results show, compared to the MDTC video coding method in [6], the proposed scheme has achieved lower redundancy rate distortion;in the scenario of packet loss, the proposed scheme outperforms the MDTC video coding method.

关键词： multiple description coding mesh-based motion compensation redundancy rate distortion packet loss

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Error Resilient multiple description coding for Mobile Sign Language Communication

Error Resilient Multiple Description Coding for Mobile Sign ...

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6th International Congress on Image and Signal Processing (CISP)

作者： Yang, Xinzhu Lanzhou Jiaotong Univ Sch Mech Engn Lanzhou 730070 Peoples R China

ISBN: (纸本)9781479927630

The primary challenge to perform mobile sign language communication over cellular network is overcoming the data loss. We proposed a new multiple descriptions coding (MDC) for protecting regions of interest (ROI) in sign language video by combining the advantages of MDC and ROI coding. The set partitioning in hierarchical trees (SPIHT) algorithm is used to generate MDC streams, and these streams are divided into ROI streams and background (BG) streams. For protection of ROI, our method assigns different redundant trees to the two kinds streams, the fully coded trees are assigned as the redundant trees of the ROI streams, the partially coded trees are assigned as the redundant trees of the BG streams. Experiment results show that our method can further increase the reconstruction quality of the ROI over noisy channels compared with other regions of interest multiple description coding methods.

关键词： regions of interest multiple description coding noisy channels sign language video

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