A markerless estimation of the ankle-foot complex 2D kinematics during stance

Date

2011-04-01

Author

Sürer, Elif
GROSSO, Enrico
DELLA CROCE, Ugo

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

148
views

0
downloads

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.

Subject Keywords

Markerless, Human movement analysis, 20 joint kinematics, Ankle-foot complex

URI

https://hdl.handle.net/11511/31309

Journal

GAIT & POSTURE

DOI

https://doi.org/10.1016/j.gaitpost.2011.01.003

Collections

Graduate School of Informatics, Article

Suggestions

OpenMETU
Core

2-D Kinematics of the Shank and Foot Complex during Stance using Markerless Segmentation and Body-Segment Anatomical Axes Identification Sürer, Elif; Della Croce, Ugo (2008-10-31) In this work, a markerless motion capture method is proposed for the 2-D description of the movement of the shank and foot complex. The video sequences of subjects walking wearing socks or barefoot, were segmented isolating the moving regions from the background. Anatomical axes of a three-segment model of the shank and foot complex were identified using two different methods applied to the segmented images: 1) skeletonization and line detection ...
A minisum location problem with regional demand considering farthest Euclidean distances DİNLER, DERYA; Tural, Mustafa Kemal (2016-06-01) We consider a continuous multi-facility location-allocation problem that aims to minimize the sum of weighted farthest Euclidean distances between (closed convex) polygonal and/or circular demand regions, and facilities they are assigned to. We show that the single facility version of the problem has a straightforward second-order cone programming formulation and can therefore be efficiently solved to optimality. To solve large size instances, we adapt a multi-dimensional direct search descent algorithm to ...
Three dimensional numerical modelling of discontinuous rocks by using distinct element method Koçal, Arman; Karpuz, Celal; Department of Mining Engineering (2008) Shear strength characterization of discontinuities is an important concept for slope design in discontinuous rocks. This study presents the development of a methodology for implementing Barton-Bandis empirical shear strength failure criterion in three dimensional distinct element code, 3DEC, and verification of this methodology. Normal and shear deformation characteristics of discontinuities and their relations to the discontinuity surface characteristics have been reviewed in detail. First, a C++ dynamic l...
A non-linear mathematical model for dynamic analysis of spur gears including shaft and bearing dynamics Özgüven, Hasan Nevzat (Elsevier BV, 1991-3) A six-degree-of-freedom non-linear semi-definite model with time varying mesh stiffness has been developed for the dynamic analysis of spur gears. The model includes a spur gear pair, two shafts, two inertias representing load and prime mover, and bearings. As the shaft and bearing dynamics have also been considered in the model, the effect of lateral-torsional vibration coupling on the dynamics of gears can be studied. In the non-linear model developed several factors such as time varying mesh stiffness an...
Analysis of the flexural strength of prestressed concrete flanged sections Baran, Eray; French, Catherine (Precast/Prestressed Concrete Institute, 2005-01-01) Inconsistencies in the sectional response of prestressed concrete flanged sections predicted by the AASHTO LRFD and AASHTO Standard Specifications, including the maximum reinforcement limits, may arise due to different interpretations of the equivalent rectangular compressive stress block idealization. Strain compatibility analyses with nonlinear material properties were performed for a variety of non-rectangular prestressed concrete sections to identify the inconsistencies between the two specifications. R...

Citation Formats

E. Sürer, E. GROSSO, and U. DELLA CROCE, “A markerless estimation of the ankle-foot complex 2D kinematics during stance,” GAIT & POSTURE, pp. 532–537, 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31309.