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Advances in Computer Graphics and Computer Vision

Nhà xuất bản : Springer

Năm xuất bản : 2008

Mô tả vật lý : 405 p.

Số phân loại : 006

Chủ đề : 1. Computer vision -- Congresses; Computer graphics -- Congresses; Imaging systems -- Congresses; VISIGRAPP. 2. Book.

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Surface editing operations commonly require geometric details of the surface to be preserved as much as possible. We argue that geometric detail is an intrinsic property of a surface and that, consequently, surface editing is best per-formed by operating over an intrinsic surface representation. This intrinsic repre-sentation could be derived from differential properties of the mesh, i.e. its Lapla-cian. The modeling process poses nonzero boundary constraints so that this idea results in a Poisson model. Different ways of representing the intrinsic geometry and the boundary constraints result in alternatives for the properties of the mod-eling system. In particular, the Laplacian is not invariant to scaling and rotations. Either the intrinsic representation is enhanced to be invariant to (linearized) trans-formations, or scaling and rotation are computed in a preprocess and are modeledas boundary constraints. Based on this representation, useful editing operations can be developed: Interactive free-form deformation in a region of interest based on the transformation of a handle, transfer and mixing of geometric detail be-tween two surfaces, and transplanting of a partial surface mesh into another sur-face. The main computation involved in all operations is the solution of a sparse linear system, which can be done at interactive rates. We demonstrate the effec-tiveness of this approach in several examples, showing that the editing operationschange the shape while respecting the structural geometric detail
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https://repository.vnu.edu.vn/handle/VNU_123/24136