Arm segment velocities of 12 athletes throwing three differently weighted balk were analyzed by three-mode principal component analysis. Individual differences were characterized in terms of the combined influences of the phases of the throwing motion and the arm segment velocity relationships established in those phases. Using three individual differences components, three velocity measures co...

Most of the inverse modeling of body dynamics in sports assumes that every segment is 'rigid' and moves 'as a whole', although we know that uncontrolled wobbling masses exist and in specific condition their motion should be optimized, both in engineering and biology. The visceral mass movement within the trunk segment potentially interferes with respiration and motion acts such as locomotion or...

Injury to finger flexor tendons or extensor digitorum tendons necessitates operations and rehabilitation to regain normal function. In this study, a system was designed to simulate the rehabilitation motions for injured finger flexor and extensor digitorum tendons, such as making a fist and extending the fingers. The dynamic system (DS) is based on a 16-segment hand model and was designed using...

We propose motion manifold learning and motion primitive segmentation framework for human motion synthesis from motion-captured data. High dimensional motion capture date are represented using a low dimensional representation by topology preserving network, which maps similar motion instances to the neighborhood points on the low dimensional motion manifold. Nonlinear manifold learning between ...

This paper describes a system which can model an assembly task performed by a human. The actions are recorded in real-time using a stereo system. The assembled objects ana' the jingers of the hand are tracked through the image sequence. We use the spatial relations between the fingers and the objects to temporally segment the task into approach, pre-manipulate, manipulate and depart phases. We ...

A kinematic analysis of human arm trajectories which underlie the production of learned, continuous movements (such as drawing of 'figure 8s' and stars) in free space is presented. The objective of this investigation was to see if a set of rules, which had been identified previously and which are appropriate for generating circular or elliptical motion of the wrist in an arbitrary plane, also h...

W. Lin, H. K. Song Department of Radiology, University of Pennsylvania, Philadelphia, PA, United States Introduction: Post-processing techniques requiring no additional navigator data have been successfully demonstrated for motion correction in MRI [1-3]. However, high computational costs typically associated with these methods have limited their application. For example, a 2-D translational co...

A two dimensional three segments coupled pendulum system that mathematically models human arm configuration was developed along with constructing and solving the equations of motions for this model using the energy (work) based approach of Lagrange. The equations of motion of the model were solved iteratively both as an initial value problem and as a two point boundary value problem. In the ini...

Line segment representations Motion estimation is a very important problem in dynamic scene analysis. Although it is easier to estimate motion parameters from 3D data than from 2D images, it is not trivial since the 3D data we have are almost always corrupted by noise. This article presents a comparative study on motion estimation from 3D line segments. Two representations of line segments and ...

This paper describes how a constrained nonlinear least-squares optimization approach can be used to recover the configuration of the segments in an arbitrary mechanical system from motion capture data. By appending the difference between markers in the model and the measured marker trajectories to the set of kinematic constraint equations, a set of over-determinate nonlinear equations will be o...