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

作者：Surer Elif^*; Cereatti Andrea; Grosso Enrico; Della Croce Ugo

来源：Gait & Posture, 2011, 33(4): 532-537.

DOI：10.1016/j.gaitpost.2011.01.003

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

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.

• 出版日期2011-4