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.
|Titolo:||A markerless estimation of the ankle–foot complex 2D kinematics during stance|
SURER, ELIF (Primo)
|Parole Chiave:||2D joint kinematics; Ankle-foot complex; Human movement analysis; Markerless|
|Settore Scientifico Disciplinare:||Settore ING-INF/06 - Bioingegneria Elettronica e Informatica|
|Data di pubblicazione:||2011|
|Digital Object Identifier (DOI):||10.1016/j.gaitpost.2011.01.003|
|Appare nelle tipologie:||01 - Articolo su periodico|