In the past many grid-based video coding schemes using image warping prediction have been proposed. The advantage of grid-based motion compensation is its ability to model nontranslational motion. Disadvantages are th...
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ISBN:
(纸本)0780374029
In the past many grid-based video coding schemes using image warping prediction have been proposed. The advantage of grid-based motion compensation is its ability to model nontranslational motion. Disadvantages are the interdependency of motion vectors which require more complex motion estimation strategies and its restricted ability to model motion boundaries. In this paper different solutions to cope with the latter deficiency are presented and compared with respect to coding efficiency, In particular, three adaptive modes for handling motion discontinuities and a block-adaptive loop filtering are presented. It is shown that these are key components for achieving a high coding gain in grid-based hybrid coding. Introducing these features into a wavelet-basedvideo coder leads to a coding gain of up to 2,5 dB compared to ITU H263+ and MPEG-4.
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