Abstract
Real-time packet video transmission over wireless networks is expected to experience bursty packet losses that can cause substantial degradation to the transmitted video quality. In wireless networks, channel state information is hard to obtain in a reliable and timely manner due to the rapid change of wireless environments. However, the source motion information is always available and can be obtained easily and accurately from video sequences. Therefore, in this paper, we propose a novel cross-layer framework that exploits only the motion information inherent in video sequences and efficiently combines a packetization scheme, a cross-layer forward error correction (FEC)-based unequal error protection (UEP) scheme, an intracoding rate selection scheme as well as a novel intraframe interleaving scheme. Our objective and subjective results demonstrate that the proposed approach is very effective in dealing with the bursty packet losses occurring on wireless networks without incurring any additional implementation complexity or delay. Thus, the simplicity of our proposed system has important implications for the implementation of a practical real-time video transmission system.
Highlights
The characteristics of wireless channels provide a major challenge for reliable transport of real-time multimedia applications since the data transmitted over wireless channels are highly sensitive to the noise, interference, and the multipath environment that can cause both packet loss and bit errors
In [5, 6], a “smart” inter/intramode switching scheme is proposed based on an RD analysis, but the effectiveness of this approach with bursty packet losses is not clear and it may be too complicated for implementation in real-time video applications
In cases where two or more successive slices are lost due to burst errors occurring on the wireless networks, this application-layer intraframe interleaving can help to maintain the effectiveness of the built-in passive error concealment (PEC) algorithm [22] by randomizing slice-level burst losses since successful reception of the neighboring slices is important for high performance recovery of any single lost slice
Summary
The characteristics of wireless channels provide a major challenge for reliable transport of real-time multimedia applications since the data transmitted over wireless channels are highly sensitive to the noise, interference, and the multipath environment that can cause both packet loss and bit errors. We focus on adaptation to source motion information since this information is always available to the encoder and can be communicated to the decoder(s) Based on this observation, we propose a novel framework that efficiently combines multiple error-resilience techniques, that is, a robust packetization scheme, a motionbased FEC/UEP scheme, a motion-based intracoding rate selection scheme as well as a novel intraframe interleaving. The contributions or novelties of this paper consist of (1) providing a robust video coding and transmission framework for scenarios where channel feedback is not available or cannot be obtained or accurately; (2) exploiting the characteristics of video source content to adaptively select the protection level in terms of intracoding rate and channel coding rate; (3) efficiently combining multiple error-resilience techniques to optimize the system performance.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
