Video Coding with Multiple Reference Frames
نویسندگان
چکیده
Zusammenfassung Bewegungskompensierte Prädiktion mit Hilfe mehrerer vergangener oder zukünftiger Referenzbilder, so genannte Multiframe-Prädiktion, kann die Kompression von Videosignalen verbessern. Multiframe-Prädiktion lässt sich in Verbindung mit den von MPEG bekannten P-Bildern, oder auch – durch Multihypothesen-Prädiktion – in Verbindung mit B-Bildern verwenden. Dieser Aufsatz fasst die aktuellen Entwicklungen zusammen, die inzwischen weitgehend in die Videocodier-Standards ITU-T Rec. H.263 und H.264/AVC – dem neuen gemeinsamen Standard von ITU-T VCEG und ISO/IEC MPEG – übernommen wurden. H.264/AVC Video übertrifft MPEG-2 bereits jetzt um mehr als den Faktor 2X. Summary Motion-compensated prediction based on multiple previous or future frames can enhance the compression efficiency of video coding. Multiframe prediction can be applied as an extension to MPEG P-Pictures, but also to B-Pictures in the form of multihypothesis prediction. We review recent advances, several of which have been embraced by the ITU-T Rec. H.263 and the emerging H.264/AVC standard, jointly developed by ITU-T VCEG and ISO/IEC MPEG. Already, H.264/AVC video outperforms MPEG-2 by a factor greater than 2X.
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