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Researches On Error Resilience Techniques For H.264/AVC Video

Posted on:2007-04-30Degree:DoctorType:Dissertation
Country:ChinaCandidate:J C DuFull Text:PDF
GTID:1118360212959882Subject:Signal and Information Processing
Abstract/Summary:PDF Full Text Request
With the technological development of communications and networks, video streaming services are playing a more and more important role in the field of network communications. However, the Internet and wireless network nowadays can not provide reliable data transmission, and the bit error and packet loss are liable to occur at the moment of delivering video streaming over these networks. For example, the characteristic of Internet of sharing path makes different services compete for the network resources with each other, which results in data congestion and packet loss, while the characteristics of wireless network of limited bandwidth, high bandwidth fluctuation and wireless channel of multi-path fading, interference make the signal be affected by not only random bit error but also burst error (packet loss). Furthermore, the current networks, such as Internet, 802.11WLAN, 3G communication systems, PSTN, ISDN, and ATM etc., are heterogeneous, namely different networks have variable poperties and traits in bandwidth and packet loss rate. Thus, data of video streaming are also liable to encounter transmission errors when delivered accross them. On the other hand, the compressed bit streams are extremely sensitive to transmission errors beacuse almost all of the current video compression standards adopt variable length coding (VLC) and spatial or temporal prediction techniques such as motion estimation. As a result, designing robust video coding schemes and efficient error control strategies becomes an important research content in the field of video transmission.Error resilient coding technique is an important means to solve robust transmission of video streaming. In this dissertation, special emphasis is given on the error resilient technique for H.264/AVC coding bit stream. The main contributions and innovation points are as follows:1. An error concealment algorithm based on hybrid spatial-temporal concealment for intra frame is proposed. Combined with motion compensation, the new method utilizes the correlations of inter frames to predict the lost information of Intra frames, and adaptively selects the mode of concealment. Since Intra frames are not encoded only at the moment of scene change, the hybrid spatial-temporal concealment method overcomes the drawback of low predictive precision from spatial interpolation method and achieves better results. The experimental results show that the proposed method highly outperforms the H.264/AVC non-normative error concealment method in quality...
Keywords/Search Tags:video error resilience, error concealment, data partitioning, multiple description coding, H.264/AVC
PDF Full Text Request
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