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multiple description coding and Practical Network coding for Video Multicast

IEEE SIGNAL PROCESSING LETTERS 2010年第3期17卷 265-268页

作者： Ramasubramonian, Adarsh K. Woods, John W. Rensselaer Polytech Inst Dept Elect Comp & Syst Engn Troy NY 12180 USA

multiple description codes have been shown to facilitate heterogeneous multicast using routing with replication. We develop the combination of practical network coding and multiple description coding (introduced by Chou et al.), but here for video multicast in lossless networks where users get video according to their available resources. We also show that network coding enables the server to provide Quality of Service that is centrally controlled. The lack of the need to maintain multiple trees (as in routing) helps in ease of construction of the multicast delivery system. The simulation results show that using practical network coding provides significant control over the rate allocation for the resources.

关键词： Heterogeneous video multicast multiple description coding practical network coding

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multiple description coding-Based Optimal Resource Allocation for OFDMA Multicast Service

Multiple Description Coding-Based Optimal Resource Allocatio...

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IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Ma, Yao Letaief, Khaled Wang, Zhengdao Murch, Ross Wu, Zhiqiang Wright State Univ Dept EE Dayton OH 45435 USA Hong Kong Univ Sci & Technol Dept ECE Kowloon Hong Kong Peoples R China Iowa State Univ Dept ECE Ames IA 50011 USA

ISBN: (纸本)9781424456383

The resource allocation optimization for multicast service in orthogonal frequency division multiple access (OFDMA) systems is an important research topic. It is known that in traditional multicast schemes the rate in each multicast group is severely limited by the user who has the minimum channel gain (MCG) on each subchannel. To counteract this effect, in this paper, we introduce the multiple description coding (MDC) into the multiple-group multicast service optimization for the downlink OFDMA, and study the weighted sum rate (WSR) maximization methods under various system constraints and assuming discrete-rate modulation. Simulation results show that the proposed method provides a significant performance enhancement than the MCG scheme and an MDC-based near-optimal iterative bit loading (IBL) approach. Besides this, our method converges very fast and enjoys a low complexity that is linear in the numbers of users, subchannels, and modulation bit levels.

关键词： OFDMA multicast service multiple description coding Lagrange duality optimization

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multiple description coding of 3D geometry with forward error correction codes

Multiple description coding of 3D geometry with forward erro...

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1st International Conference on 3DTV

作者： Bici, M. Oguz Norkin, Andrey Akar, Gozde Bozdagi Gotchev, Atanas Astola, Jaakko Middle E Tech Univ TR-06531 Ankara Turkey Tempere Univ Technol Inst Signal Proc Tampere Finland

ISBN: (纸本)9781424407217

This work presents a multiple description coding (MDC) scheme for compressed three dimensional (3D) meshes based on forward error correction (FEC). It allows flexible allocation of coding redundancy for reliable transmission over error-prone channels. The proposed scheme is based on progressive geometry compression, which is performed by using wavelet transform and modified SPIHT algorithm. The proposed algorithm is optimized for varying packet loss rates (PLR) and channel bandwidth. Modeling distortion-rate function considerably decreases computational complexity of bit allocation.

关键词： multiple description coding 3D geometry computer graphics wavelets FEC

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multiple description coding for Encrypted Images 11

Multiple Description Coding for Encrypted Images

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11th International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP)

作者： Zhang, Yuan Zhang, Xinpeng Qin, Chuan Yu, Jiang Shanghai Univ Sch Commun & Informat Engn Shanghai 200041 Peoples R China Huzhou Univ Sch Informat Engn Huzhou Peoples R China Univ Shanghai Sci & Technol Sch Opt Elect & Comp Engn Shanghai Peoples R China

ISBN: (纸本)9780769556680

This work proposes a novel multiple description coding (MDC) method for encrypted images transmitted over unreliable networks. Here, a pseudorandom permutation is used to mask the original content to protect privacy. The encoder splits the encrypted data into two descriptions, and each description includes different rigid pixels and coefficients generated from orthogonal transform to the elastic pixels. An acceptable quality reconstruction can be decodable from the side decoder through iteratively updating the values of coefficients based on the spatial correlation. At the central decoder, since the more accurate rigid pixels received, the more similar predicted image can be considered as initialization. Moreover, the operation of iterative reconstruction twice to unknown pixels also makes the estimations closer to the real values. Therefore, a high quality reconstruction from multiple descriptions can be obtained at the central decoder. Comparison is made with the single description coding and the experiments result is shown that the reconstruction performance with the multiple description coding for encrypted images is significantly improved.

关键词： encrypted image image transmission multiple description coding

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multiple description coding with Polar Codes

Multiple Description Coding with Polar Codes

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27th Queen's Biennial Symposium on Communications (QBSC)

作者： Valipour, Mehrdad Yousefi, Shahram Queens Univ SDAL Dept ECE Kingston ON K7L 3N6 Canada

ISBN: (纸本)9781479939725

The use of multiple descriptions (MD) provides a reliable communications solution over packet loss channels;the polar source coding (PC) takes advantage of reasonable complexities in both the encoder and decoder sides. In this paper, a polar multiple description coding is introduced for the binary input sequence with Hamming distortion in which the central decoder is aided by a common description from the encoder. The algorithm for the frozen bit selection is studied. The performance evaluation demonstrates the effectiveness of the proposed system for MD with PC.

关键词： multiple description coding Polar code ENCODER Performance Evaluation Personal computers Packet loss decoders BIT SELECTION binary input

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multiple description coding of plane-based 3-D surfaces

Multiple description coding of plane-based 3-D surfaces

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IEEE International Conference on Image Processing (ICIP 2007)

作者： Park, Sung-Bum Kim, Chang-Su Lee, Sang-Uk Samsung Electronics Co. Ltd. South Korea School of Electrical Engineering Korea University Seoul South Korea School of Electrical Engineering INMC Seoul National University Seoul South Korea

ISBN: (纸本)9781424414369

We present a multiple description coding (MDC) scheme for 3-D plane-based surfaces. First, planes are split into two disjoint subsets, called descriptions, each of which provides an equal contribution in 3-D surface reconstruction. To optimize the quality of the decoded surface, planes in each description are adaptively compressed according to the channel error condition. Then, the two compressed bitstreams are transmitted over distinct channels to the decoder. At the decoder, if both channels are available, the two bitstreams are decoded and merged together to reconstruct a high quality surface. If only one channel is available, we employ a hole filling method to fill visual holes and reconstruct a smooth 3-D surface. Therefore, the proposed algorithm provides an acceptable 3-D surface, even when one channel is totally lost.

关键词： error resilient transmission multiple description coding plane-based 3-D surface graph coloring and hole filling

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multiple description coding FOR WIDEBAND AUDIO SIGNAL TRANSMISSION

MULTIPLE DESCRIPTION CODING FOR WIDEBAND AUDIO SIGNAL TRANSM...

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IEEE International Conference on Network Infrastructure and Digital Content

作者： Wey, Hoseok Ito, Akinori Suzuki, Yoiti Tohoku Univ Elect Commun Res Inst Sendai Miyagi 980 Japan Tohoku Univ Grad Sch Informat Sci Sendai Miyagi Japan Tohoku Univ Dept Elect & Commun Engn Sendai Miyagi Japan Tohoku Univ Grad Sch Engn Sendai Miyagi Japan

ISBN: (纸本)9781424448982

In audio communications over a lossy packet network, packet loss concealment techniques are needed to mitigate a user's frustration when perceiving the deterioration of the quality of the decoded signal. multiple description coding (MDC) is a useful solution to this problem. In this paper, we describe an MDC method to conceal packet losses for wideband audio streaming based on the sample splitting method in the time domain and encoding by an MPEG-I audio layer III (MP3) encoder. Experiments were conducted to compare the proposed method with several conventional methods, results confirming that our proposed method performs the playback of the decoded signal with sufficient quality for a range of bit rates from 160 to 320 kbps, even with a transmitted packet loss rate of 10%.

关键词： Robust communications Packet loss concealment multiple description coding

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multiple description coding WITH RANDOMLY OFFSET QUANTIZERS

MULTIPLE DESCRIPTION CODING WITH RANDOMLY OFFSET QUANTIZERS

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Meng, Lili Liang, Jie Samarawickrama, Upul Zhao, Yao Bai, Huihui Kaup, Andre Beijing Jiaotong Univ Inst Informat Sci Beijing Peoples R China Simon Fraser Univ Sch Engn Sci Burnaby BC Canada Microsoft Corp Redmond WA USA Univ Erlangen Nurnberg Erlangen Germany

ISBN: (纸本)9781467357623;9781467357609

A multiple description coding scheme based on prediction-induced randomly offset quantizers is proposed, where each description encodes one source subset with a small quantization stepsize, and other subsets are predictively coded with a large quantization stepsize. Due to the prediction, the quantization bins that a coefficient belongs to in different descriptions are randomly overlapped with each others. The optimal reconstruction is obtained by finding the intersection of all received quantization bins. Using the recently developed random quantization theory, the closed-form expression of the expected distortion is obtained. The proposed scheme is then applied to lapped transform-based multiple-description image coding, and an iterative optimization scheme is developed to find the optimal lapped transform. Experimental results show that the proposed scheme achieves better performance than other methods in this category.

关键词： multiple description coding predictive coding random quantization

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multiple description coding of video using phase scrambling

Multiple description coding of video using phase scrambling

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IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： Hojjat, Seyed Parsa Fazelpour, Sina Shirani, Shahram McMaster Univ Dept Elect & Comp Engn Hamilton ON L8S 4K1 Canada

ISBN: (纸本)9781424411894

In this paper, we proposed a method to decrease the effects of data loss in communication of a video sequence using phase scrambling. Phase scrambling is used to spread the data of each pixel of a video sequence over all pixels of the scrambled video. In our experiments we studied the effects of different loss patterns. The results obtained by employing this method shows great improvements compared to cases of data loss without exploiting phase scrambling. This technique can be readily used in transmission of video segments over unreliable networks.

关键词： Video sequences Videotapes multiple description coding scrambling data loss pixel Phase

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multiple description coding of 3D Dynamic Meshes Based on Temporal Subsampling

Multiple Description Coding of 3D Dynamic Meshes Based on Te...

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Conference on Visual Information Processing and Communication

作者： Bici, M. Oguz Akar, Gozde Bozdagi Middle E Tech Univ TR-06531 Ankara Turkey

ISBN: (纸本)9780819479365

In this paper, we propose a multiple description coding (MDC) method for reliable transmission of compressed time consistent 3D dynamic meshes. It trades off reconstruction quality for error resilience to provide the best expected reconstruction of 3D mesh sequence at the decoder side. The method is based on partitioning the mesh frames into two sets by temporal subsampling and encoding each set independently by a 3D dynamic mesh coder. The encoded independent bitstreams or so-called descriptions are transmitted independently. The 3D dynamic mesh coder is based on predictive coding with spatial and temporal layered decomposition. In addition, the proposed method allows for different redundancy allocations by including a number of encoded spatial layers of the frames in the other set. The algorithm is evaluated with redundancy-rate-distortion curves and it is shown that, when one of the descriptions is lost, acceptable quality can be achieved with around 50% redundancy.

关键词： multiple description coding 3D dynamic meshes time consistent mesh sequence

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