We present a novel method of contact modelling for discrete deformable models. Our algorithm is used to simulate contact between rigid surgical tools of arbitrary shape and deformable virtual organs bounded by triangular mesh surfaces. It uses a divide and conquer strategy to redistribute an arbitrary field of displacements on organ surfaces into an equivalent field of displacements at the node...

In this Note we study a parameter identification problem associated with a two-dimensional mechanical problem. In a first part, the experimental technique of determining the displacement field is presented. The variational method proposed herein is based on the minimization of a separately convex functional which leads to the reconstruction of the elastic tensor and the stress field. These two ...

AbstractRecently, deep-learning-based approaches have been widely studied for deformable image registration task. However, most efforts directly map the composite representation to spatial transformation through convolutional neural network, ignoring its limited ability capture correspondence. On other hand, Transformer can better characterize relationship with attention mechanism, long-range d...

All electrostatic fields E (i.e., ones with no time dependence) can be derived from a scalar potential V (E = −∇V ) and hence obey ∇ × E = 0. The latter condition is sometimes considered to be a requirement for electrostatic fields. Show, however, that there can exist time-dependent electric fields for which ∇ × E = 0, which have been given the name “electrostatic waves”. In particular, show th...

The dynamic response (i.e., acceleration and displacement) of a bridge under vehicular load is an important component of design and evaluation. Field measurement of girder displacement, however, is generally nontrivial. Traditional sensors often require a stationary reference such as temporary scaffolds or a suspended cable. In either form, there are added costs, restrictions, and labor. As a r...

The displacement structure is extended to a Kronecker matrix W ⊗ Z. A new class of Kronecker-like matrices with the displacement rank r, r < n will be formulated and presented. The computational complexity of multiplication with vectors for Kronecker-like matrices has been accelerated. Applying the displacement, which was originally discovered by Kailath, Kung and Morf [15], a new superfast alg...

This paper presents a new robust approach for registration and segmentation. Segmentation as well as registration is attained by morphing of an N -dimensional model, the Morphon, onto the N dimensional data. The approach is general and can, in fact, be said to encompass much of the deformable model ideas that have evolved over the years. However, in contrast to commonly used models, a distingui...

Min Ma National University of Defense Technology Department of Astronautical Technology Changsha, 410073, China Abstract. A single fringe phase shifting technique is presented for extracting the whole-field displacement distribution from single fringe patterns. By making a small modification in the traditional Fourier transform (FFT) method for fringe processing, the proposed method is capable ...

We propose a novel approach to landmark-based medical image registration based on the geostatical method of Kriging prediction. Our method exploits the spatial statistical relation between two images, as estimated using generalpurpose registration algorithms, in order to construct an optimum predictor of the displacement field. High accuracy is achieved by using an estimated spatial model of th...