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Issue No.02 - February (2008 vol.30)
pp: 315-327
ABSTRACT
In previous optimization-based methods of 3D planar-faced object reconstruction from single 2D line drawings, the missing depths of the vertices of a line drawing (and other parameters in some methods) are used as the variables of the objective functions. A 3D object with planar faces is derived by finding values for these variables that minimize the objective functions. These methods work well for simple objects with a small number N of variables. As N grows, however, it is very difficult for them to find expected objects. This is because with the nonlinear objective functions in a space of large dimension N, the search for optimal solutions can easily get trapped into local minima. In this paper, we use the parameters of the planes that pass through the planar faces of an object as the variables of the objective function. This leads to a set of linear constraints on the planes of the object, resulting in a much lower dimensional nullspace where optimization is easier to achieve. We prove that the dimension of this nullspace is exactly equal to the minimum number of vertex depths which define the 3D object. Since a practical line drawing is usually not an exact projection of a 3D object, we expand the nullspace to a larger space based on the singular value decomposition of the projection matrix of the line drawing. In this space, robust 3D reconstruction can be achieved. Compared with two most related methods, our method not only can reconstruct more complex 3D objects from 2D line drawings, but also is computationally more efficient.
INDEX TERMS
3D object reconstruction, degree of reconstruction freedom, line drawing, nullspace, singular value decomposition
CITATION
Jianzhuang Liu, Liangliang Cao, Zhenguo Li, Xiaoou Tang, "Plane-Based Optimization for 3D Object Reconstruction from Single Line Drawings", IEEE Transactions on Pattern Analysis & Machine Intelligence, vol.30, no. 2, pp. 315-327, February 2008, doi:10.1109/TPAMI.2007.1172
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