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• W2185542026 abstract "A main objective of the human movement analysis is the quantitative description of jointkinematics and kinetics. This information may have great possibility to address clinical problemsboth in orthopaedics and motor rehabilitation. Previous studies have shown that the assessment ofkinematics and kinetics from stereophotogrammetric data necessitates a setup phase, specialequipment and expertise to operate. Besides, this procedure may cause feeling of uneasiness on thesubjects and may hinder with their walking. The general aim of this thesis is the implementationand evaluation of new 2D markerless techniques, in order to contribute to the development of analternative technique to the traditional stereophotogrammetric techniques.At first, the focus of the study has been the estimation of the ankle-foot complex kinematicsduring stance phase of the gait. Two particular cases were considered: subjects barefoot andsubjects wearing ankle socks. The use of socks was investigated in view of the development of thehybrid method proposed in this work. Different algorithms were analyzed, evaluated andimplemented in order to have a 2D markerless solution to estimate the kinematics for both cases.The validation of the proposed technique was done with a traditional stereophotogrammetricsystem. The implementation of the technique leads towards an easy to configure (and morecomfortable for the subject) alternative to the traditional stereophotogrammetric system.Then, the abovementioned technique has been improved so that the measurement of kneeflexion/extension could be done with a 2D markerless technique. The main changes on theimplementation were on occlusion handling and background segmentation. With the additionalconstraints, the proposed technique was applied to the estimation of knee flexion/extension andcompared with a traditional stereophotogrammetric system. Results showed that the kneeflexion/extension estimation from traditional stereophotogrammetric system and the proposedmarkerless system were highly comparable, making the latter a potential alternative for clinical use.A contribution has also been given in the estimation of lower limb kinematics of the childrenwith cerebral palsy (CP). For this purpose, a hybrid technique, which uses high-cut underwear andankle socks as “segmental markers” in combination with a markerless methodology, was proposed.The proposed hybrid technique is different than the abovementioned markerless technique in termsof the algorithm chosen. Results showed that the proposed hybrid technique can become a simpleand low-cost alternative to the traditional stereophotogrammetric systems." @default.
• W2185542026 created "2016-06-24" @default.
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• W2185542026 date "2011-04-08" @default.
• W2185542026 modified "2023-09-24" @default.
• W2185542026 title "ANALYSIS OF HUMAN BODY KINEMATICS USING A HYBRID MARKERLESS VIDEO ACQUISITION AND PROCESSING" @default.
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• W2185542026 doi "https://doi.org/10.6092/unibo/amsdottorato/3633" @default.
• W2185542026 hasPublicationYear "2011" @default.
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