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A Markerless estimation of the ankle–foot complex 2D kinematics during stance

Surer, Elif and Cereatti, Andrea and Grosso, Enrico and Della Croce, Ugo (2011) A Markerless estimation of the ankle–foot complex 2D kinematics during stance. Gait & Posture, Vol. 33 (4), p. 532-537. eISSN 1879-2219. Article.

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DOI: 10.1016/j.gaitpost.2011.01.003

Abstract

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.

Item Type:Article
ID Code:5734
Status:Published
Refereed:Yes
Uncontrolled Keywords:Markerless, human movement analysis, 2D joint kinematics, ankle–foot complex
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-INF/05 Sistemi di elaborazione delle informazioni
Area 09 - Ingegneria industriale e dell'informazione > ING-INF/06 Bioingegneria elettronica e informatica
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze biomediche
001 Università di Sassari > 01 Dipartimenti > Economia, impresa, regolamentazione
Publisher:Elsevier
eISSN:1879-2219
Deposited On:26 May 2011 11:04

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