GEOMETRIC REGISTRATION OF HIGH-GENUS SURFACES CHENGFENG WEN AND LOK MING LUI

Abstract. This paper presents a method to obtain geometric registrations between high-genus (g ≥ 1) surfaces. Surface registration between simple surfaces, such as simply-connected open sur-faces, has been well studied. However, very few works have been carried out for the registration of high-genus surfaces. The high-genus topology of the surface poses great challenge for surface registration. A possible approach is to partition surfaces into simply-connected patches and registra-tion is done patch by patch. Consistent cuts are required, which are usually difficult to obtain and prone to error. In this work, we propose an effective way to obtain geometric registration between high-genus surfaces without introducing consistent cuts. The key idea is to conformally parameterize the surface into its universal covering space, which is either the Euclidean plane or the hyperbolic disk embedded in R2. Registration can then be done on the universal covering space by minimiz-ing a shape mismatching energy measuring the geometric dissimilarity between the two surfaces. Our proposed algorithm effectively computes a smooth registration between high-genus surfaces that matches geometric information as much as possible. The algorithm can also be applied to find a smooth and bijective registration minimizing any general energy functionals. Numerical experiments on high-genus surface data show that our proposed method is effective for registering high-genus surfaces with geometric matching. We also applied the method to register anatomical structures for medical imaging, which demonstrates the usefulness of the proposed algorithm. Key words. Surface registration, high-genus surface, universal covering space, conformal pa-rameterization, shape mismatching energy 1. Introduction. Registratio