(Portions reprinted, with permission, from J. Quintas Pedro, Luís Ducla Soares, Catarina Brites, João Ascenso, Fernando Pereira, Carlos Bandeirinha, Shuiming Ye, Frédéric Dufaux, Touradj Ebrahimi, “Studying error resilience performance for a feedback channel based transform domain Wyner-Ziv video codec”, PCS' 2007. ©2007 EURASIP.)
The objective of this research activity is to study in detail the error-resilience performance of the transform domain Wyner–Ziv (TDWZ) codec, developed in VISNET I for packet-based networks. The RD performance in the presence of channel errors will first be studied for different error conditions. More specifically, the way the TDWZ codec deals with errors in the two main components of the bitstream – key frames and WZ frames – will be studied in detail.
In all scenarios, the feedback channel used by the decoder to ask the encoder for more parity information will be considered error free. This corresponds to a realistic option, because the total bit rate of the feedback channel is so low when compared to the downstream bit rate that very strong channel coding could easily be used to guarantee that it has no errors.
In the following section the effect of channel errors on different parts of the bitstream will be considered, leaving the subject of comparison with the state-of-the-art H.264/AVC codec for future investigations.