A hybrid markerless approach for 2D gait analysis: application to gait of children with cerebral palsy
Altro
Data di Pubblicazione:
2011
Citazione:
A hybrid markerless approach for 2D
gait analysis: application to gait of children with cerebral palsy / E. Surer, P. Kasi, A. Cereatti, P. Bonato, U. Della Croce. ((Intervento presentato al 23rd. convegno Congress of International Society of Biomechanics (ISB 2011) tenutosi a Brussels, Belgium nel 2011.
Abstract:
A 2D hybrid markerless technique is proposed to estimate the
lower limb joint kinematics in children with cerebral palsy
(CP). The markerless methodology presented is defined as
hybrid since it uses garments as “segmental markers”,
specifically high-cut underwear which contributes in defining
the pelvis segment and ankle socks for the definition of the
foot segment. Six CP children participated in this study and
five trials were recorded for each subject. The proposed
technique requires the following steps: anthropometric
measurements, video acquisition (Figure a), segmentation
(Figure b), skeletonization (Figure c), thresholding and edge
detection (Figure d), determining intersection points (Figure e)
and fitting reference axes (Figure f). Validation was done by
comparing the lower limb joint kinematics estimated by the
hybrid approach with those obtained using a marker-based
system. The average angular offsets were in the range of 2.9-
4.5 for ankle plantar/dorsi-flexion (α), 0.3-2.1 for knee
flexion/extension (β) and 0.4-2.4 for hip flexion/extension (γ).
The average RMSD results were in the range of 2.8-6.0 for the
(α), 3.9-8.5 (β) and 3.9-7.6 and (γ) angles. RMSD values were
in general within the intra-subject variability. The proposed
technique can be a possible economical alternative for
estimating the lower limb joint kinematics of children with
CP.
Tipologia IRIS:
14 - Intervento a convegno non pubblicato
Elenco autori:
E. Surer, P. Kasi, A. Cereatti, P. Bonato, U. Della Croce
Link alla scheda completa: