PRIORITIZED PACKETIZATION FOR VIDEO WITH INTRA-REFRESH MACROBLOCK LINE
Sandro Moiron, Ismail Ali, Martin Fleury, Mohammed GhanbariAbstract
When transmitting video over low bandwidth networks a cyclic intra-refresh (IR) line is preferable to periodic intra frames as an error mitigation technique. This paper shows that an IR line introduces non-uniform error sensitivity between regions within a picture that are identifiable by the position of the IR line. An unequal error protection scheme is proposed to exploit this characteristic, whereby different priorities are assigned at a packet level in order to offer better protection to the more important packets. The proposed scheme is demonstrated for prioritized access under IEEE 802.11e to a sensor network subject to congestion. Experimental results indicate that, when compared with the classic non prioritized packet access scheme, the proposed scheme can achieve quality gains up to 3.6 dB for a 10% data loss rate.
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