DocumentCode :
2832522
Title :
Hierarchical mesh-based global motion estimation, including occlusion areas detection
Author :
Laurent, Nathalie
Author_Institution :
France Telecom R&D, CessonSevigne, France
Volume :
3
fYear :
2000
fDate :
2000
Firstpage :
620
Abstract :
We present a method which is able to determine the occlusion areas appearing in a mesh-based motion estimation. The use of the motion estimation scheme based on a non-uniform hierarchical triangular mesh and the optimization of the nodal motion vectors by means of a multi-resolution differential method leads to efficient and fast motion estimation as well as motion field refinement. Although global motion estimation avoids the blocking artifacts due to the independence of the neighboring blocks of conventional block matching, it can only find the optimal motion parameters, which derive from the motion vectors at the node points that are shared by several patches of a continuous field. However real motion in a video sequence is discontinuous. Thus, our goal consists of modeling the artifacts, resulting from the occlusions by using a global mesh. Contrary to the segmented mesh associated with the video object when fast motion has to be estimated, surface mesh may contain overlapping triangles and the estimated image is thus deteriorated. In fact, these overlaps allow the detection of the occlusions. Thus, our method consists of taking into account this information to determine the optimal motion vectors in the continuous field and to generate the content of the uncovered area or to exclude the content of the covered area. To illustrate the new performances of the proposed method, results showing the capabilities of our mesh-based motion estimation to determine discontinuities lines are presented
Keywords :
hidden feature removal; image resolution; image sequences; mesh generation; motion estimation; optimisation; video signal processing; blocking artifacts; discontinuous motion; global motion estimation; mesh-based motion estimation; motion field refinement; multi-resolution differential method; nodal motion vectors optimization; nonuniform hierarchical triangular mesh; occlusion areas detection; optimal motion parameters; overlapping triangles; surface mesh; video sequence; Bit rate; Encoding; Image segmentation; Motion analysis; Motion detection; Motion estimation; Optimization methods; Research and development; Video sequences; Video sharing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Image Processing, 2000. Proceedings. 2000 International Conference on
Conference_Location :
Vancouver, BC
ISSN :
1522-4880
Print_ISBN :
0-7803-6297-7
Type :
conf
DOI :
10.1109/ICIP.2000.899530
Filename :
899530
Link To Document :
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