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检索条件"主题词=Multiple description coding"

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Format-Compliant Perceptual Video Encryption Based on multiple description coding

Format-Compliant Perceptual Video Encryption Based on Multip...

引用

IEEE 11th Malaysia International Conference on Communications (MICC)

作者： Kamnoonwatana, Nawat Mahidol Univ Fac Informat & Commun Technol Nakhon Pathom Thailand

ISBN: (纸本)9781479915323

This paper proposes a new format-compliant perceptual encryption scheme based on the multiple description coding (MDC). The proposed technique exploits the scalable property of MDC which results in multiple encrypted format-compliance video streams. An unbalanced MDC was specially designed to serve the purpose of perceptual encryption in such a way that it provides the control over quality differences and number of achievable qualities. In general, the perceived quality is directly proportional to the number of video descriptions that can be correctly decrypted. In order to preserve format compliant property of the encoded video streams, the proposed scheme was designed based on a pre- and post-processing multiple description video coding method and an encryption process at bit stream level. Hence, no alterations are required for both coding and encryption processes. Even though the proposed framework is format independent, this paper focuses on the H.2641AVC video coding standard. The experimental results demonstrate that the proposed scheme can successfully integrate encryption and a multiple description coding technique while preserving other multiple description video coding characteristics such as scalability and robustness.

关键词： Perceptual Encryption Video Enciyption Video Processing multiple description coding

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FEC-based scalable multiple description coding for overlay network streaming

FEC-based scalable multiple description coding for overlay n...

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2nd IEEE Consumer Communications and Networking Conference

作者： Wang, GJ Futemma, S Itakura, E Information Technology Lab. Sony Japan

ISBN: (纸本)0780387848

We consider the problem of distributing video data from a server to a population of interested clients. Deploying overlay network with application-layer multicast, we propose it FEC-based scalable multiple description coding (SMDC) scheme to arrive at the solution to the problem. Without the performance penalty on each receiver, our SMDC can achieve optimal performance of each client with different net-work conditions as simply as additional assembling and truncating operations. In the mean time, a R-D allocation algorithm is presented to decide the rates of the source and channel. Simulation shows that our SMDC have better quality for heterogeneous receivers than traditional scheme.

关键词： multiple description coding overlay network scalable video streaming

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Combinatorial Message Sharing and Random Binning for multiple description coding

Combinatorial Message Sharing and Random Binning for Multipl...

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IEEE International Symposium on Information Theory

作者： Akyol, Emrah Viswanatha, Kumar Rose, Kenneth Univ Calif Santa Barbara Santa Barbara CA 93106 USA

ISBN: (纸本)9781467325790

This paper proposes a new multiple description (MD) coding method and an associated achievable rate-distortion region for L >= 2 channels. The proposed scheme randomly bins codebooks chosen from the codebook structure, similar to that of the recently proposed combinatorial message sharing (CMS) scheme designed for conditional codebook encoding. The proposed scheme effectively performs multilayer random binning for each subset of the description, which hence enables to utilize the symmetry of a "subset" of the description rates wherever it exists. The new scheme specializes in to the conventional multilayer random binning as an extreme special case.

关键词： multiple description coding source coding rate-distortion theory

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Joint Temporal and Spatial multiple description coding for H.264 Video

Joint Temporal and Spatial Multiple Description Coding for H...

引用

IEEE International Conference on Image Processing

作者： Chen, Jian-Yu Tsai, Wen-Jiin Natl Chiao Tung Univ Dept Comp Sci Hsinchu Taiwan

ISBN: (纸本)9781424479948

multiple description video coding (MDC) is one of the techniques used to reduce the detrimental effects caused by transmission over error-prone networks. This paper presents a hybrid MDC method which segments the video along spatial and temporal dimensions, and provides efficient estimation methods for missing description reconstruction. The experimental results confirm the improved error resilience capability achieved by the proposed hybrid MDC in lossy networks.

关键词： multiple description coding description estimation temporal segmentation spatial segmentation

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Optimal overcomplete subband expansions for multiple description coding

Optimal overcomplete subband expansions for multiple descrip...

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Conference on Wavelet Applications in Signal and Image Processing VIII

作者： Mehrotra, S Microsoft Corp Redmond WA 98052 USA

ISBN: (纸本)0819437646

We study the use of overcomplete (also known as oversampled) subband expansions for multiple description coding. The system proposed uses an overcomplete subband expansion (a subband expansion in which the number of subbands is larger than the downsampling factor of each subband) followed by independent coding (quantization and coding) of each of the subbands. The entire coding of each of the subbands is entirely contained within a single description. Using analysis in the polyphase domain, we study finding frequency responses of optimal filterbanks and the rate allocation across the subbands to minimize the end-to-end reconstruction error subject to a transmission rate constraint when a distribution over channel states is known. A general analysis of the problem is given and results are shown for a 3 x 2 expansion of a first-order autoregressive process.

关键词： multiple description coding overcomplete subband expansions oversampled subband expansions overcomplete linear expansions frame expansions joint source-channel coding erasure channel coding

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Use of Spatial Division Scheme in multiple description coding Algorithm for Multipoint Videoconferencing

Use of Spatial Division Scheme in Multiple Description Codin...

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International Siberian Conference on Control and Communications (SIBCON)

作者： Tarakanov, Alexey Gushchina, Olga PG Demidov Yaroslavl State Univ Dept Phys Yaroslavl Russia

ISBN: (纸本)9781479971039

The paper presents analysis of multiple description coding (MDC) algorithm with spatial division of video stream into substreams. Two objective quality criteria Peak Signal-to-Noise Ratio (PSNR) and Video Quality Metric (VQM) were used for rating of video quality. In case when network losses affect on any video substreams full picture is restored with using of linear interpolation. Presented results demonstrate high efficiency of the MDC algorithm up to 50% losses of information.

关键词： multiple description coding videoconferencing video quality H.264

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On Natural Type Selection in Universal multiple description coding

On Natural Type Selection in Universal Multiple Description ...

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Data Compression Conference (DCC)

作者： Fan, Yuhua Wang, Jia Sun, Jun Shanghai Jiao Tong Univ Dept Elect Engn Shanghai 200030 Peoples R China

ISBN: (纸本)9780769543529

In this paper, we generalize the concept of natural type selection, initially proposed by *** ***., to multiple description coding. We prove results that are parallel to those of adaptive single description coding. A universal multiple description coding scheme is then proposed. The scheme codes a source vector at a time, and updates its codebooks based on the joint type of the codewords reconstructed previously. Based on our theoretical results, it can be shown that the rate-distortion performance of the proposed scheme gradually improves as coding proceeds.

关键词： multiple description coding codeword Rate distortion Universal Scheme codebook Articular system Codes

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3D Video multiple description coding Considering Region of Interest 12

3D Video Multiple Description Coding Considering Region of I...

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12th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications (VISIGRAPP)

作者： Rahimi, Ehsan Joslin, Chris Carleton Univ Dept Syst & Comp Engn 1125 Colonel By Dr Ottawa ON Canada

ISBN: (纸本)9789897582257

3D video is becoming a most favorable video and attracting researcher's mind to provide robust methods of streaming since packet failure has always been the inseparable characteristic of wired or wireless networks. This paper aims to provide a new multiple description coding for 3D video considering objects existed in the scene. To this end, a low complex algorithm for realizing objects in 3D scene will provided and then a nonidentical decimation method with respect to objects will be utilized to produce descriptions of MDC approach. Also, in point of depth map image, a new non-identical MDC algorithm will be be introduced to stream depth map image saving bandwidth without affecting the quality of decoded video in the receiver side.

关键词： Multimedia Communication 3D Video Colorful 2D Image Gray Scale Depth Map Image multiple description coding Error Prone Environment Packet Failure Spatial Decimation Compression Efficiency

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LOW COMPLEXITY M-CHANNEL multiple description coding WITH TWO-RATE PREDICTIVE coding AND STAGGERED QUANTIZATION

LOW COMPLEXITY <i>M</i>-CHANNEL MULTIPLE DESCRIPTION CODING ...

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15th IEEE International Conference on Image Processing (ICIP 2008)

作者： Samarawickrama, Upul Liang, Jie Simon Fraser Univ Sch Engn Sci Burnaby BC V5A 1S6 Canada

ISBN: (纸本)9781424417650

This paper presents a new low complexity multiple description coding (MDC) method that can generate any number of descriptions. For correlated sources, a special DPCM encoder is used in each description, such that it carries higher rate information of a subset of the samples and lower rate information of the rest. The lower rate codings in different descriptions are designed to be mutually refinable using staggered scalar quantizers. The closed-form expression of the expected distortion is derived when an arbitrary subset of the descriptions are received. Experimental results on natural images using lapped transform show that the proposed method is competent with the state-of-the-art multiple description image coders.

关键词： multiple description coding Predictive coding information theory image coding

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Prediction-compensated multiple description coding with optimal weighted reconstruction

Prediction-compensated multiple description coding with opti...

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Canadian Conference on Electrical and Computer Engineering

作者： Wang, Jing Liang, Jie Simon Fraser Univ Sch Engn Sci Burnaby BC V5A 1S6 Canada

ISBN: (纸本)9781424416424

In this paper, a weighted reconstruction method for the prediction-compensated multiple description coding (PC-MDC) with two descriptions is proposed. Different from the original PC-MDC, where the redundant data are simply discarded when both descriptions are received, we use a weighted average of all available data to recover the signal. The closed-form solution of the optimal weighting factors and the corresponding bit allocations are derived for M-band perfect reconstruction filter bank based PC-MDC. The asymptotic performance of the method is also studied. Theoretical analysis shows that the proposed method further reduces the expected distortion and the distortion product of the non-weighted PC-MDC method.

关键词： multiple description coding filter bank information theory

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