We propose a new multipledescription spherical quantization with repetitively coded amplitudes (MDSQRA) scheme suited for quantization of sinusoidal parameters. The quantization scheme is constituted by a set of sphe...
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We propose a new multipledescription spherical quantization with repetitively coded amplitudes (MDSQRA) scheme suited for quantization of sinusoidal parameters. The quantization scheme is constituted by a set of spherical quantizers inspired by the multipledescription spherical trellis-coded quantization (MDSTCQ) scheme. In this scheme, we apply repetitive coding on the amplitudes, while multiple description coding are applied on the phases and frequencies. Thereby, MDSQRA becomes directly implementable, as opposed to MDSTCQ, since the phase and frequency quantizers depend on the amplitudes which have dissimilar descriptions in MDSTCQ. Furthermore, we implement MDSQRA into a perceptual matching pursuit based sinusoidal audio coder. Finally, we evaluate MDSQRA through perceptual distortion measurements and MUSHRA listening tests. The tests show that MDSQRA outperforms MDSTCQ with respect to a expected perceptual distortion measure. The same results are obtained through the MUSHRA tests performed on sound clips coded using MDSQRA and MDSTCQ.
In this paper, a prediction-compensated multipledescription (MD) coding framework for two-band filter banks is proposed, in which the coefficients in each subband are split into two descriptions. Each description als...
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In this paper, a prediction-compensated multipledescription (MD) coding framework for two-band filter banks is proposed, in which the coefficients in each subband are split into two descriptions. Each description also includes the prediction residuals of the data in the other description. The designs of the optimal orthogonal and biorthogonal filter banks are formulated in a unified framework, and both one-level and multiple-level decompositions are analyzed. Contrary to the existing MD filter banks in the literature, the optimal filter banks in the proposed scheme are quite similar to those in single descriptioncoding. Therefore, the method can be applied to systems with single-description-optimized filter banks and still attain near-optimal performance. Image coding results show that this method achieves better performance and lower complexity than the latest JPEG 2000 based MDC.
In the past few years, video streaming has been one of the most prominent applications in the Internet. There are basically two types of approaches to deliver on-demand video streams: infrastructure-based and infrastr...
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In the past few years, video streaming has been one of the most prominent applications in the Internet. There are basically two types of approaches to deliver on-demand video streams: infrastructure-based and infrastructure-less. The infrastructure-based approach, also known as the content delivery network (CDN) approach. employs numerous replicate servers and proxies to assist video streaming. The main drawback of this approach is that it is costly to deploy numerous servers and proxies. The infrastructure-less approach, also known as the peer-to-peer (P2P) approach, employs numerous peers to relay video streams. The main drawback of the P2P approach is its instability due to frequent joining/leaving of peers. The state-of-the-art development is to combine the two types of approaches. In this paper, we employ multiple description coding (MDC) to develop a novel P2P-assisted proxy caching scheme, called MP3, for on-demand video streaming. Our simulation results show that with the use of MDC, MP3 call effectively provide adaptive video quality for clients in a heterogeneous network environment.
multiple description coding (MDC) with side information (SI) at the receiver is particularly relevant for robust transmission in sensor networks where correlated data is being transmitted to a common receiver, as well...
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multiple description coding (MDC) with side information (SI) at the receiver is particularly relevant for robust transmission in sensor networks where correlated data is being transmitted to a common receiver, as well as for robust video compression. The rate-distortion region for this problem has been established in (Vaishampayan 1993). Here, we focus on the design of a practical MDC scheme with SI at the receiver. It builds upon both MDC principles and Slepian-Wolf (SW) coding principles. The input source is first quantized with a multipledescription scalar quantizer (MDSQ) which introduces redundancy or correlation in the transmitted streams in order to take advantage of the path diversity. The resulting sequences of indexes are SW encoded, that is, separately encoded and jointly decoded. While the first step (MDSQ) plays the role of a channel code the second one (SW coding) plays the role of a source code, compressing the sequences of quantized indexes. In a second step, the cross-decoding of the two descriptions is proposed. This allows us to account for both the correlation with the SI as well as the correlation between the two descriptions. Copyright (C) 2009 Olivier Crave et al.
multiple description coding （MDC） generates multiple decodable bitstreams for a source to combat informa- tion loss. In this paper, multipath routing problem for two-description coded images is investigated for trad...
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multiple description coding （MDC） generates multiple decodable bitstreams for a source to combat informa- tion loss. In this paper, multipath routing problem for two-description coded images is investigated for traditional and coded wireless networks without and with coding capability at intermediate nodes, respectively. Firstly, we formulate an interference-aware MDC multipath routing for traditional networks by employing a time-division link scheduling method to eliminate wireless interference, and ultimately obtain an optimal path selection corresponding to the minimum achievable distortion. Secondly, for coded networks, we evaluate practical wireless network coding （NC） in delivering descriptions of multiple unicast sessions. While NC increases maximum supporting flow rate of MDC descriptions in wireless networks, possible undecodability of NC mixed information is alleviated by MDC. To minimize achievable distortion, a proposed interference-and-coding-aware MDC multipath routing strikes a good balance between minimizing side effect of wireless interference avoidance and maximizing NC opportunity. Simulation results validate the effectiveness of the two proposed schemes.
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 ...
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ISBN:
(纸本)9781424443178
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 vertices into two sets 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 duplicating a number of encoded spatial layers in both sets. The algorithm is evaluated with redundancy-rate-distortion curves and flexible trade-off between redundancy and side distortions can be achieved.
multiple description coding (MDC) has been proposed as a source coding technique that is robust to channel errors for video transmission. MDC generates multiple independent bit-streams, where the multiple bit-streams ...
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ISBN:
(纸本)9781424435098
multiple description coding (MDC) has been proposed as a source coding technique that is robust to channel errors for video transmission. MDC generates multiple independent bit-streams, where the multiple bit-streams are referred to as multipledescriptions (MD). Furthermore, it enables a useful reproduction of the signal when any description is received correctly. This paper proposes a new multicast heuristic algorithm, that attempts to take the benefit of MDC properties and multiple paths, to improve the user's satisfaction for a group of heterogeneous destinations in wireless ad hoe network. Extensive simulations clearly demonstrate the effectiveness of the proposed algorithm in improving the user's satisfaction irrespective of the number of destinations in the multicast group.
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 ...
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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.
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 l...
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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 multipledescription 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 multipledescription scalable coding method in terms of PSNR by 0.3 dB.
This work compares theoretically the performance of several representative practical multipledescription (MD) frameworks with L >= 3 symmetric descriptions. The first scenario is the classic unequal erasure protec...
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This work compares theoretically the performance of several representative practical multipledescription (MD) frameworks with L >= 3 symmetric descriptions. The first scenario is the classic unequal erasure protection (UEP) scheme using a successively refinable code (SRC) and Reed-Solomon codes. The second scenario is an improvement upon UEP by applying domain partitioning and permuted Reed-Solomon codes. The third scenario uses a finer partitioning and erasure correction via repetition codes. Additionally, the MD lattice vector quantizer and another recent MD scheme are considered in the comparison. The aforementioned MD schemes are compared in terms of the expected squared error asymptotically achievable as the rate R of a description approaches infinity, assuming independent description losses. Our analysis reveals that the improvement of the second scenario upon the first one when R -> infinity can reach up to 1.68 dB, but it approaches 0 as the description loss rate p goes to 0 and L approaches infinity. Additionally, we find that the first two schemes outperform the third one with an unbounded gain when R -> infinity, as p -> 0 or L -> infinity. Further, we show that the first three scenarios achieve unbounded improvements over the other two as R -> infinity and p -> 0. On the other hand, we point out that some of the results of our asymptotic analysis rely on strong assumptions and therefore an experimental validation is needed before applying them to practical situations.
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