Article

A markerless technique is proposed and applied to estimate the two-dimensional
joint kinematics of the shank and foot complex during the stance phase. Image
sequences were acquired with a single camera from three healthy subjects while
walking barefoot and with socks. Automatic segmentation of the shank and foot was
performed to isolate the moving body from the background.
A multi-rigid body
model for the shank and foot complex, with the relevant segment anatomical axes,
was defined and an image cross-correlation technique was applied to detect the
anatomical axes locations throughout the movement.
The proposed markerless
technique was validated by acquiring the same trials also with a stereophotogrammetric marker-based system and a simple marker set. Differences in
the joint kinematics estimates obtained with the two techniques fall in most
cases within the intra-subject variability showing that, in selected
applications, the markerless technique may replace more expensive and more
experimental time demanding marker-based techniques.
CI - Copyright (c) 2011 Elsevier B.V. All rights reserved.

Langue : ANGLAIS