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error-resilient motion-estimation architecture Aubrey, Texas

Lost slices in the key-frames have been concealed using the standard intra frame concealment strategy used in H.264/AVC JM11 decoder, whereas no concealment has been applied to the WZ frames. For this reason, DVC is particularly suited for applications that requires very simple, cheap, and low-power encoding.A second expected advantage of DVC is related to the intrinsic ability to cope with The properties of DVC in terms of error resilience have been discussed, for example, in [6, 7, 16]. Related Works4.

It can be observed that, in spite of the decoding error in position , the reconstructed sequence, from position on, is correct. The reason for using such an approach is manyfold. Experimental Setup The DISCOVER and PRISM experimental setups are the same considered for their respective frame-by-frame analysis. In some sense it is possible to say that this decoding process performs a joint motion estimation and WZ decoding.

Institutional Sign In By Topic Aerospace Bioengineering Communication, Networking & Broadcasting Components, Circuits, Devices & Systems Computing & Processing Engineered Materials, Dielectrics & Plasmas Engineering Profession Fields, Waves & Electromagnetics General MSSU-COE-ERC-05-01 Mississippi State ERC, Mississippi State University, Mississippi State, Miss, USA; January 2005.Google ScholarCopyright©Claudia Tonoli et al.2009 This article is published under license to BioMed Central Ltd. In the following, a more in-depth evaluation of the error robustness for DVC schemes will be provided. 4. Moreover, the H.264/AVC quality increases very slowly, due to the fact that the number of lost slices is often higher than the correcting capability of the channel code.

Nevertheless, an accurate analysis of the behavior of the two basic architectures of distributed video codecs has only been preliminary conducted. Local PSNR losses are due to errors in the decoder-side motion estimation, and are therefore present also in the error-free curve. Copyright © 2016 ACM, Inc. Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP '06), May 2006, Toulouse, France 2: 525-528.Google ScholarFowler JE: An implementation of PRISM using QccPack.

Your cache administrator is webmaster. PRISM Codec Temporal Performance Assessment In this section we report and discuss the results of the simulations of PRISM codec, in order to understand its sensitivity to transmission errors and its The admissible values for are divided into cosets and, for every , the corresponding  bit coset index is sent. A detailed discussion concerning the transmission of the video signal over unreliable channels is however out of the scope of the present paper, and the interested reader can find a more

However, using multiple reference frames causes to degradation of video quality due to the ineffectiveness of error resilience and error propagation when some errors occurs in video data during transmission. The motion vectors may relate to the whole image (global motion estimation) or specific parts, such as rectangular blocks, arbitrary shaped patches or even per pixel. Indeed key-frames quality would remain poor, whereas WZ frames can be well reproduced, which cannot be perceptually well tolerated. Best effort packet-based transmission over networks, which do not ensure that all sent packets are correclty received, are the most widespread nowadays.

We consider both logic and memory design aspects and cover modeling and analysis, as well as design methodology to achieve simultaneously low power and variation tolerance, while minimizing design overhead. Frame-by-Frame Temporal Analysis 5.1.1. In Figures 7 and 8, similar results can be observed for the Hallmonitor test sequence. During the transmission of the first one (corresponding to frame n.23 in the plots of Figures 5 and 6) a slice loss has occurred, leading to a very significant quality impairment.

Performance Comparison We have repeated the simulation at different coding rates using the described configurations. This is due to the fact that the H.264/AVC is not able to compensate for lost information, whereas the DVC codec is able to request additional parity bits through the feedback Each slice is assumed to represent the payload of a single network packet. Our evaluations have highlighted in all cases a strong dependence of the behavior of the various codecs to the content of the considered video sequence.

In particular, there is a clear difference between the behavior of the key-frames and the behavior of the Wyner-Ziv frames. Proceedings of the 25th International Picture Coding Symposium (PCS '06), April 2006, Beijing, ChinaGoogle ScholarPoulliat C, Declercq D, Fijalkow I: Enhancement of unequal error protection properties of LDPC codes. Rep. In this case, we can see that the frame-by-frame PSNR curve shows significant oscillations.

On the other hand, when is encoded in a distributed fashion, the behavior in presence of channel errors is completely different. No detailed description for every single block of the codec will be given (interested readers may refer to [8, 10, 13, 29] for a more accurate presentation of each component). Then, the decoding of a WZ frame is performed by first generating a side information (SI), that is an estimate of the missing frame, usually obtained by motion compensated interpolation between Considering PLR of , DISCOVER outperforms slightly H.264/AVC, and the performance gain slowly increases with the bitrate.As a general comment, the obtained results highlight that in all the considered cases

From these simulations, it emerges that the main drawback of the DISCOVER approach (based on the feedback channel) in terms of error resilience seems to be the lack of uniformity in As proposed in the reference example, it is assumed that is a  bit random variable and that can differ from in at most  bit.The considered predictive Proceedings of Packet Video Workshop (PV '06), April 2006, Hangzhou, ChinaGoogle ScholarRane S, Baccichet P, Girod B: Modeling and optimization of a systematic lossy error protection system based on H.264/AVC redundant This would actually be a very small payload to be sent in a single packet.

US & Canada: +1 800 678 4333 Worldwide: +1 732 981 0060 Contact & Support About IEEE Xplore Contact Us Help Terms of Use Nondiscrimination Policy Sitemap Privacy & Opting Out For every candidate predictor, a WZ decoding is performed using the received parity bits of the original transformed coefficients. Lost blocks are replaced by the co located blocks in the previous frame (zero-motion prediction). In this case, the H.264+FEC system would be able to compensate for transmission errors in a similar manner to a DVC solution that uses feedback; the FEC decoder would simply keep

Indeed, the quality of the decoded WZ frames is much higher than that of the corrupted key-frames. The range of voltage levels that represents each state depends on the logic family being used. The increase in the WZ rate is mainly due to two causes. Concluding remarks are given in Section 6. 2.