Kinematics estimation of straddled movements on high bar from a limited number of skin markers using a chain model

Mickael Begon 1 Pierre-Brice Wieber 2 Maurice Raymond Yeadon 1
2 BIPOP - Modelling, Simulation, Control and Optimization of Non-Smooth Dynamical Systems
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, INPG - Institut National Polytechnique de Grenoble
Abstract : To reduce the effects of skin movement artefacts and apparent joint dislocations in the kinematics of whole body movement derived from marker locations, global optimisation procedures with a chain model have been developed. These procedures can also be used to reduce the number of markers when self-occlusions are hard to avoid. This paper assesses the kinematics precision of three marker sets: 16, 11 and 7 markers, for movements on high bar with straddled piked posture. A three-dimensional person-specific chain model was defined with 9 parameters and 12 degrees of freedom and an iterative procedure optimised the gymnast posture for each frame of the three marker sets. The time histories of joint angles obtained from the reduced marker sets were compared with those from the 16 marker set by means of a root mean square difference measure. Occlusions of medial markers fixed on the lower limb occurred when the legs were together and the pelvis markers disappeared primarily during the piked posture. Despite these occlusions, reconstruction was possible with 16, 11 and 7 markers. The time histories of joint angles were similar; the main differences were for the thigh mediolateral rotation and the knee flexion because the knee was close to full extension. When five markers were removed, the average angles difference was about 3. This difference increased to 9 for the seven marker set. It is concluded that kinematics of sports movement can be reconstructed using a chain model and a global optimisation procedure for a reduced number of markers.
Type de document :
Article dans une revue
Journal of Biomechanics, Elsevier, 2008, 41 (3), pp.581-586. <10.1016/j.jbiomech.2007.10.005>
Liste complète des métadonnées

https://hal.inria.fr/inria-00390475
Contributeur : Pierre-Brice Wieber <>
Soumis le : mardi 2 juin 2009 - 11:27:00
Dernière modification le : dimanche 27 juillet 2014 - 16:08:17
Document(s) archivé(s) le : jeudi 10 juin 2010 - 22:03:55

Fichier

Begon2008JB.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Mickael Begon, Pierre-Brice Wieber, Maurice Raymond Yeadon. Kinematics estimation of straddled movements on high bar from a limited number of skin markers using a chain model. Journal of Biomechanics, Elsevier, 2008, 41 (3), pp.581-586. <10.1016/j.jbiomech.2007.10.005>. <inria-00390475>

Partager

Métriques

Consultations de
la notice

254

Téléchargements du document

212