Biorthogonal wavelets with 4-fold axial symmetry for quadrilateral surface multiresolution processing

Author: Jiang, Qingtang

Source: Advances in Computational Mathematics, Volume 34, Number 2, February 2011 , pp. 127-165(39)

Publisher: Springer

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Surface multiresolution processing is an important subject in CAGD. It also poses many challenging problems including the design of multiresolution algorithms. Unlike images which are in general sampled on a regular square or hexagonal lattice, the meshes in surfaces processing could have an arbitrary topology, namely, they consist of not only regular vertices but also extraordinary vertices, which requires the multiresolution algorithms have high symmetry. With the idea of lifting scheme, Bertram (Computing 72(1–2):29–39, 2004) introduces a novel triangle surface multiresolution algorithm which works for both regular and extraordinary vertices. This method is also successfully used to develop multiresolution algorithms for quad surface and $\sqrt 3$ triangle surface processing in Wang et al. (Vis Comput 22(9–11):874–884, 2006; IEEE Trans Vis Comput Graph 13(5):914–925, 2007) respectively. When considering the biorthogonality, these papers do not use the conventional $L^2({{\rm I}\kern-.2em{\rm R}}^2)$ inner product, and they do not consider the corresponding lowpass filter, highpass filters, scaling function and wavelets. Hence, some basic properties such as smoothness and approximation power of the scaling functions and wavelets for regular vertices are unclear. On the other hand, the symmetry of subdivision masks (namely, the lowpass filters of filter banks) for surface subdivision is well studied, while the symmetry of the highpass filters for surface processing is rarely considered in the literature. In this paper we introduce the notion of 4-fold symmetry for biorthogonal filter banks. We demonstrate that 4-fold symmetric filter banks result in multiresolution algorithms with the required symmetry for quad surface processing. In addition, we provide 4-fold symmetric biorthogonal FIR filter banks and construct the associated wavelets, with both the dyadic and $\sqrt 2$ refinements. Furthermore, we show that some filter banks constructed in this paper result in very simple multiresolution decomposition and reconstruction algorithms as those in Bertram (Computing 72(1–2):29–39, 2004) and Wang et al. (Vis Comput 22(9–11):874–884, 2006; IEEE Trans Vis Comput Graph 13(5):914–925, 2007). Our method can provide the filter banks corresponding to the multiresolution algorithms in Wang et al. (Vis Comput 22(9–11):874–884, 2006) for dyadic multiresolution quad surface processing. Therefore, the properties of the scaling functions and wavelets corresponding to those algorithms can be obtained by analyzing the corresponding filter banks.

Keywords: 4-fold symmetry; 42C40; 65D17; 65T60; 68U07; Biorthogonal $\sqrt 2$ -refinement wavelets; Biorthogonal filter banks; Biorthogonal wavelets; Surface multiresolution decomposition/reconstruction; Surface multiresolution processing

Document Type: Research Article


Affiliations: Department of Mathematics and Computer Science, University of Missouri—St. Louis, St. Louis, MO, 63121, USA, Email:

Publication date: February 1, 2011

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