Virtual interactive examination of the quality of car body surfaces is an important issue in the development process of a car. The method is based on simulating reflection lines using striped environment maps and strong specular highlights. For this purpose high quality meshes are created from the NURBS surfaces. However, the meshes have a fixed resolution, hence a closer examination requires a...

An integer version of the well-known de Casteljau algorithm of NURBS curves is presented here. The algorithm is used to render NURBS curves of any degree on a raster device by turning on pixels that are closest to the curve. The approximation is independent of the parametrization, that is, it is independent of the weights used. The algorithm works entirely in the screen coordinate system and pr...

In this paper, we present a novel non-uniform rational B-spline (NURBS) muscle system for the simulation of human facial expressions and talking animation based on features extracted from video sequences. We construct the facial muscles based on anatomical knowledge and NURBS models. We use 43 feature points to represent facial expressions and apply a lip contour extraction technique to determi...

Abstract The key job here in the presented work is to investigate performance of Generalized Ant Colony Optimizer (GACO) model order evolve shape three dimensional free-form Non Uniform Rational B-Spline (NURBS) curve using stereo (two) views. GACO a blend two well known meta-heuristic optimization algorithms as Simple and Global Optimization algorithms. Basically, talks about solution NURBS-fi...

As the number of models in 3D databases grows, an efficient 3D models indexing mechanism and a similarity measure to ease model retrieval are necessary. In this paper, we present a query-by-model framework for NURBS based B-Rep models retrieval that combines partial symmetry of the object and the Fourier shape descriptor of canonical 2D projections of the 3D models. In fact, most objects are co...

The present research investigates the implementations of different computational geometry technologies in isogeometric analysis framework for computational fracture mechanics. NURBS and T-splines are two different computational geometry technologies which are studied in this work. Among the features of B-spline basis functions, the possibility of enhancing a B-spline basis with discontinuities ...

This article introduces a new method for discretizing and solving integral equation formulations of Maxwell's equations, which achieves spectral accuracy smooth surfaces. The approach is based on hybrid Nyström-collocation using Chebyshev polynomials to expand the unknown current densities over curvilinear quadrilateral surface patches. As an example, proposed strategy applied magnetic field (M...

S. Pajevic, P. J. Basser MSCL/CIT, National Institutes of Health, Bethesda, MD, United States, NICHD/STBB, NIH, Bethesda, MD, United States Introduction: Diffusion Tensor MRI (DTI) measures a diffusion tensor of water in tissue, fr om which useful micr ostructural information can be obtained [1]. DTI provides information about the local diffusion field from which one can attempt to reconstruct...