Accurate localization and tracking of facial features are crucial for developing high-quality model-based coding systems. In this paper we describe the integration of simple heuristics which are e!ective in improving the results of well-known facial feature detection with robust techniques for adapting a dynamic mesh for animation. A new method of generating a self-adaptive mesh using an extend...

It is increasingly popular to represent non-rigid motion using a deforming mesh sequence: a discrete sequence of frames, each of which is given as a mesh with a common graph structure. Such sequences have the flexibility to represent a wide range of mesh deformations used in practice, but they are also highly redundant, expensive to store, and difficult to edit in a time-coherent manner. We add...

This paper presents an efficient method for the dynamic simulation of inextensible cloth. The triangle mesh for our cloth model is simulated using an impulse-based approach which is able to solve hard constraints. Using hard distance constraints on the edges of the triangle mesh removes too many degrees of freedom, resulting in a rigid motion. This is known as the locking problem which is typic...

Recent technological improvement in character animation has increased the number of characters that can appear in a virtual scene. Besides, skeletal and mesh structures are expected to be more complex in the future. Therefore, simulating massive characters’ joints in a real-time crowd environment without any preprocessing is unaffordable. We propose a preprocessing method called ‘motion level-o...

In this paper we propose a new general framework for the application of the nonlinear finite element method (FEM) to nonrigid motion analysis. We construct the models by integrating image data and prior knowledge, using well-established techniques from computer vision, structural mechanics, and computer-aided design (CAD). These techniques guide the process of optimization of mesh models. Linea...

A total solution for computer facial animation is proposed. First, a well-de ned 3D head model is deformed according to several photographs with di erent views, where the 3D head model exhibits good animation features. After pose recovery, B ezier curves are used to depict the subtle contours on a face. Moreover, elastic deformation can be applied to adjust the locations of global features. We ...

We present a modular framework for mechanically regularized nonrigid image registration of 3D ultrasound and for identification of tissue mechanical parameters. Mechanically regularized deformation fields are computed from sparsely estimated local displacements. We enforce image-based local motion estimates by applying concentrated forces at mesh nodes of a mechanical finite-element model. The ...

in this paper, direct numerical simulation of two-phase incompressible gas-liquid flow for simulation of bubble motion in a microtube is presented. microtube radius is 10 µm. the interface is tracked using volume of fluid (vof) method with continuous surface force (csf) model. the flow is solved using a finite volume scheme, based on piso algorithm. numerical simulation is performed on a axisym...

In this work, we introduce a novel boundary-conforming mesh-update method that is particularly designed for problems with large boundary displacements and topology changes. This method, which call the surface-reconstruction virtual-region mesh update integrates virtual region approach surface reconstruction process to handle complex movements. The allows having an activated deactivated part of ...

A Kokotsakis mesh is a polyhedral structure consisting of an n-sided central polygon P0 surrounded by a belt of polygons in the following way: Each side ai of P0 is shared by an adjacent polygon Pi, and the relative motion between cyclically consecutive neighbor polygons is a spherical coupler motion. Hence, each vertex of P0 is the meeting point of four faces. In the case n = 3 the mesh is par...