ACM SIGMOBILE Mobile Computing and Communications Review
Mitigating the impact of hardware defects on multimedia applications: a cross-layer approach
MM '08 Proceedings of the 16th ACM international conference on Multimedia
VLC/FLC data partitioning with intra AC prediction disabled
Journal of Visual Communication and Image Representation
Error-Aware Algorithm/Architecture Coexploration for Video Over Wireless Applications
ACM Transactions on Embedded Computing Systems (TECS)
ACM Transactions on Embedded Computing Systems (TECS)
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Optimising delivery of video codecs such as MPEG-4 is vital to ensure that acceptable quality can be offered to 3G network customers. The error prone nature of mobile channels means that the video codec that is employed must be fairly robust. In the past, such research has required alteration to existing standards. Given the imminent implementation of 3G technologies, changing the standards is not a convenient option. This paper presents a technique for altering MPEG-4 encoding parameters to increase the error robustness of the output bitstream. It exploits the fact that frames with a high degree motion are often more sensitive to error than those with low amounts of motion. Using a simple model, the video packet length and number of adaptive intra refresh (AIR) blocks are varied according to the amount of motion in a frame. Simulations using a GPRS channel are presented to confirm the benefits of the proposed scheme.