Browsing by Author "Wen, Wei-Chung"

Now showing 1 - 2 of 2

Dynamic FEC-Distortion optimization for H.264 scalable video streaming
(2007)
Wen, Wei-Chung
;
Hsiao, Hsu-Feng
;
Yu, Jen-Yu
;
資訊工程學系
;
Department of Computer Science
Forward error correction codes have been shown to be a feasible solution either in application layer or in link layer to fulfill the need of Quality of Service for multimedia streaming over the fluctuant channels. In this paper, we propose FEC-distortion optimization algorithms to efficiently utilize the bandwidth for better video quality. The optimization criterions are based on the unequal error protection by taking account of the error drifting problems from both temporal motion compensation and inter-layer prediction of H.264/MTEG-4 AVC scalable video coding. Also, it can adapt to the content-dependent quality contribution of each video frame in a video layer. Lightweight error-concealment is also incorporated with the proposed algorithms for better H.264 SVC streaming. For some applications where either computation might be the bottleneck or the upper bound of non-decodable probability of each video layer is specified, alternative bandwidth allocation algorithm is provided with the trade-off of slight quality degradation.
Hierarchical Optimization of Cascading Error Protection Scheme for H.264 Scalable Video Streaming
(2011-03-01)
Wen, Wei-Chung
;
Hsiao, Hsu-Feng
;
資訊工程學系
;
Department of Computer Science
Forward error correction (FEC) coding has been shown to offer a feasible solution to fulfill the need for Quality of Service for multimedia streaming over the fluctuant channels, especially in terms of the reduction of end-to-end delay. In this paper, we propose the Dynamic FEC-Distortion Optimization Algorithm to efficiently utilize the network bandwidth for better visual quality by means of hierarchical coding structure with the cascading error protection scheme. The optimization criteria are based on the unequal error protection by taking account of the error drifting problems from both temporal motion compensation and inter-layer prediction of the H.264/MPEG-4 AVC scalable video coding so that the priorities of each video components can be differentiated for the calculation of the distribution of parity packets. It is shown that the cascading error protection scheme makes the hierarchical structure of error erasure code more efficient. Also, the proposed algorithm works particularly well for fast motion videos and the performance does not depend on accurate estimation of packet loss rate.