A sequence-based error-concealment algorithm for an unbalanced multiple description video coding system

22nd International Conference on Advanced Information Networking and Applications (Aina 2008)

et al. 2008

Robust transmission of live video over ad hoc wireless networks presents new challenges: high bandwidth requirements are coupled with delay constraints; nodes are constrained in processing power and storage capacity; ad hoc wireless networks suffer from bursty packet losses that drastically degrade the viewing experience. Accordingly, we propose a simple, but practical unbalanced multiple description (UMD) codec that uses single path transport only. At the UMD decoder, the lost LowResolution (LR) frames can be recoded from the corresponding ones of the correctly received HighResolution (HR) stream. This makes LR more robust to packet losses and ensures continuous video playback. The simulation results show that the proposed UMD codec has higher decoded quality, smaller quality fluctuation and lower probability of pause than other error resilience techniques, especially when channel burstiness becomes large. We also propose a novel sequence-based error concealment (EC) algorithm for our UMD decoder. It recursively uses multi-frame recovery principle to frame-by-frame reduce error drift in the HR description with respect to the LR description. In fact, the algorithm can be applied to most UMD schemes. It has the advantage of working on integer-, half-or quarter-pixel precision and looking backward without buffering future frames. Experimental results show that error decreases the fastest if the UMD decoder uses our EC algorithm. It can provide satisfactory performance on both objective and subjective evaluation. 1

Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

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Supporting Live Video on Ad Hoc Wireless Networks: Unbalanced Multiple Description Coding, Single Path Transport and Recursive Error Concealment

22nd International Conference on Advanced Information Networking and Applications (Aina 2008)

et al. 2008

“…MDC essentially come in two flavors, consisting of balanced and unbalanced MDC. In balanced MDC approaches [2] the two descriptions have the same importance while in unbalanced MDC [3] one description has a higher quality than the other. Since in UMDC, the Low Resolution (LR) description is primarily used as redundancy and exploited to conceal errors in the High Resolution (HR) description, UMDC gives better control on the amount of introduced redundancy than BMDC.…”

Section: Introductionmentioning

confidence: 99%

Optimized Rate Allocation for Unbalanced Multiple Description Video Coding Over Unreliable Packet Network

2006 IEEE International Conference on Multimedia and Expo

2006

Video transmission over unreliable packet network is in general hampered by the packet losses and constraint by stringent playback deadline. With these two key factors in consideration, Multiple Description Coding (MDC),comprising balanced and Unbalanced MDC has been proposed as an errorrobust source coding technique. Recently, transmitting multiple descriptions over a single path is interesting due to the unavailability of multiple independent paths. Therefore, in this paper, we investigate the problem of rate allocation for the High-Resolution (HR) and Low-Resolution (LR) descriptions in UMDC transmission over single path. We first propose an approximate but efficient rate allocation model with the aid of two-state Markov link model and a simple distortion model at the sender side. Then we conduct extensive experiments to verity the proposed model and more excitedly the simulation results clearly demonstrate the effectiveness of proposed model.

“…As long as these descriptions do not encounter packet losses concurrently, an acceptable quality could be obtained. In balanced MDC approaches [4] the two descriptions have the same importance while in unbalanced MDC [5] one description has a higher quality than the other. Since in UMDC, the Low Resolution (LR) description is primarily used as redundancy and exploited to conceal errors in the High Resolution (HR) description, UMDC gives a better control on the amount of introduced redundancy, compared with BMDC.…”

Section: Introductionmentioning

confidence: 99%

An Unbalanced Multiple Description Coding Scheme for Video Transmission Over Wireless Ad Hoc Networks

2006 IEEE International Conference on Multimedia and Expo

2006

Video transmission over wireless ad hoc networks is hampered by packet losses. Even a single packet loss may cause error propagation until an intra-coded frame is received. Indeed, packet losses greatly degrade the video quality. In this paper, we propose an Unbalanced Multiple Description Coding (UMDC) scheme over a single path which requires only one single path as additional links are difficult to be guaranteed in reality and is capable of quickly recovering from packet losses and ensuring continuous playback. The proposed scheme uses two descriptions, the High-Resolution (HR) description and the Low-Resolution (LR) one. It uses the 'peg frames' to limit error propagation in the HR description. The two descriptions can help each other recover from packet losses. The simulation results show that the proposed UMDC scheme over a single path has a comparable performance with our UMDC scheme with multiple path transmission (MPT) and has a better viewing experience than the state-of-the-art FEC-based scheme.