Data di Pubblicazione:
2010
Citazione:
Measurement of knee
flexion/extension using a 2-D markerless technique / E. Surer, P. Kasi, A. Cereatti, P. Bonato, U. Della Croce. ((Intervento presentato al 2nd. convegno Secondo Congresso Nazionale
di Bioingegneria (GNB’2010) tenutosi a Torino, Italy nel 2010.
Abstract:
Several measurement tools are typically used in assessing knee flexion/extension: electro-goniometers,
inertial sensors, 2-D and 3-D marker based motion analysis systems [1]. Most of the traditional
clinical analysis methods require applying sensors to the patients, which may cause discomfort and
hinder the natural movement. To overcome the aforementioned limitations, in this study, we propose a
2-D markerless technique to measure knee flexion/extension. This study is an enhancement of our
previous markerless technique [2]. The focus of the first study was the analysis of the 2-D kinematics
of the shank and foot complex using a single lateral view by defining a three-segment model and
tracking its movement using selected patches rigid to the segment. To simplify the problem, a black
background was used and the subjects wore long black socks to cover the contra-lateral leg. In this
study, we developed a markerless technique, which does require neither a black background nor a
black long sock on the contra-lateral leg. The presence of a more complex background was dealt with
by using an adaptive statistical background subtraction model, while the removal of the long black
sock on the contra-lateral leg resulted in occlusions that are dealt with by defining an additional patch
per segment to be used when the occlusion occurs on the main patch. As for the previous study, the
proposed technique will be validated acquiring the same trials with both the single camera used in the
proposed markerless technique and a traditional stereophotogrammetric system. This technique is
expected to provide a simple and reliable knee flexion/extension measurement.
Tipologia IRIS:
14 - Intervento a convegno non pubblicato
Elenco autori:
E. Surer, P. Kasi, A. Cereatti, P. Bonato, U. Della Croce
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