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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 44895 (19)
- University: Sharif University of Technology
- Department: Computer Engineering
- Advisor(s): Kasaei, Shohreh
- Abstract:
- One major problem in sport match analysis and interpretation is that there are restricted viewpoints of the game. 3D reconstruction allows us to have virtual replay from any viewpoint so that the events such as penalties can be detected easily. For achieving this purpose, we use many cameras with overlapped views that cover almost all parts of the field. After some preprocessing, 3D reconstruction and texture mapping, we can enhance the viewer experience by having arbitrary viewpoint of the match. In this research, we use two different visual hull methods for 3D reconstruction. In the first method, the visual hull of an object is computed efficiently and robustly from image contours. This work is done by retrieving visual hull viewing edges associated to the viewing lines passing through camera center and silhouette vertices. The other method uses an image-based approach fusing foreground silhouettes information from multiple arbitrary views without camera calibration. This process delivers 2D grids of object parallel to a reference plane in a direction along the body of object. At last, occupancy grids are stacked on top of each other and create a 3D data structure that encapsulated the object shape and location. One of the advantages of this method is that the trade of between the reconstruction quality and time cost can be controlled. This is done by specifying number of slices
- Keywords:
- Three Dimensional Modeling ; Three Dimensional Reconstruction ; Arbitrary Viewpoint ; Multiview Videos ; Visual Holl Planes ; Volume Intersection
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