Skin marker-based stereophotogrammetry provides a non-invasive and radiation-free approach in human motion analysis. It has been widely used to study the normal function and pathological conditions of human musculoskeletal system. One major limitation of this technique is usually referred to as soft tissue artifact (STA), which is defined as the relative movement between skin markers and the underlying bone. Much effort has been devoted to developing techniques for STA compensation and better motion analysis accuracy. However, the problem has not yet been solved satisfactorily.

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