Surface Reconstruction from Multiple Views Using Rational B-Splines
BOSTON UNIV MA DEPT OF COMPUTER SCIENCE
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A method for reconstructing 3D rational B-spline surfaces from multiple views is proposed. The method takes advantage of the projective invariance properties of rational Bsplines. Given feature correspondences in multiple views, the 3D surface is reconstructed via a four step framework. First, corresponding features in each view are given an initial surface parameter value s t, and a 2D B-spline is fitted in each view. After this initialization, an iterative minimization procedure alternates between updating the 2D Bspline control points and re-estimating each feature s s t. Next, a non-linear minimization method is used to upgrade the 2D B-splines to 2D rational B-splines, and obtain a better fit. Finally, a factorization method is used to reconstruct the 3D B-spline surface given 2D B-splines in each view. This surface recovery method can be applied in both the perspective and orthographic case. The orthographic case allows the use of additional constraints in the recovery. Experiments with real and synthetic imagery demonstrate the efficacy of the approach for the orthographic case.
- Numerical Mathematics