In the field of image coding, it has recently been shown that quad-tree schemes for representing geometric image features are unable to obtain the optimal exponentially decaying rate-distortion behaviour - a problem which can be rectified by following R-D optimal tree pruning with a leaf merging step. Inspired by such results, we note that quad-tree based motion representations for video compression suffer from the same fundamental shortcomings, which can again be overcome by leaf merging. Based on these observations, we describe a non-iterative low complexity extension to the existing motion model used by H.264, demonstrating significant improvements in overall compression performance. At low to moderate bit-rates, our experimental implementation yields reductions of 10% or more in overall bit-rate, relative to H.264. Perhaps more importantly, this paper reinforces the importance of leaf merging as a general tool for quad-tree based modeling schemes.


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    Titel :

    On the benefits of leaf merging in quad-tree motion models


    Beteiligte:
    De Forni, R. (Autor:in) / Taubman, D.S. (Autor:in)


    Erscheinungsdatum :

    01.01.2005


    Format / Umfang :

    318949 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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