DocumentCode :
381974
Title :
Efficient and robust motion estimation in grid-based hybrid video coding schemes
Author :
Heising, Guido
Author_Institution :
Image Process. Dept., Heinrich-Hertz-Inst., Berlin, Germany
Volume :
1
fYear :
2002
fDate :
2002
Abstract :
In the past advanced motion compensation techniques have been introduced leading to improved temporal predictions in hybrid video coding schemes. The focus of this paper is on grid-based warping prediction. The advantage of this technique compared to the commonly used block translational motion compensation is its improved capability to handle non-translational motion. However, a disadvantage is its 2-dimensional interdependency of motion vectors. This can lead to poor predictions, if the dependencies are not considered during the motion estimation process. Therefore in this paper a new highly efficient motion estimation method for grid-based prediction is presented. Different means are developed to improve the prediction quality, to decrease the computational complexity and to enhance the robustness of the algorithm. By introducing a hierarchical iterative octagonal matching with spatial and temporal prediction of candidate vectors for the motion search into a wavelet-based hybrid video coder a coding gain of up to 1.5 dB compared to MPEG-4 can be achieved.
Keywords :
computational complexity; data compression; iterative methods; motion compensation; motion estimation; prediction theory; transform coding; video coding; wavelet transforms; MPEG-4; block translational motion compensation; coding gain; computational complexity; efficient motion estimation; grid-based hybrid video coding; grid-based prediction; grid-based warping prediction; hierarchical iterative octagonal matching; motion search; motion vectors; nontranslational motion; prediction quality; robust motion estimation; spatial prediction; temporal prediction; wavelet-based hybrid video coder; Computational complexity; Focusing; Image coding; Image processing; Iterative algorithms; Motion compensation; Motion estimation; Robustness; Vectors; Video coding;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Image Processing. 2002. Proceedings. 2002 International Conference on
ISSN :
1522-4880
Print_ISBN :
0-7803-7622-6
Type :
conf
DOI :
10.1109/ICIP.2002.1038120
Filename :
1038120
Link To Document :
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