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Bone Texture Map Transfer based on Surface Correspondence and Parametric Deformation
Phan Cong-Bo(판콩보),Seungbum Koo(구승범) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Texture map is a well-known technique to represent a geometric characteristics or surface detail of a 3-D model. We presented a framework to transfer a texture map from a template bone surface to another bone surface in a consistent visualization. The geometry of each model was used as guidance for registration in object space and parametric space. Iterative closest point algorithm with scaling was employed to match two three-dimensional surfaces. These bone parameterization were then deformed to correspond to each other via a sampling point set by using a modified spherical thin-plate spline method. Our results demonstrated that the approach is simple and effective for transferring texture.
Cong-Bo Phan(판콩보),Seungbum Koo(구승범) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The human foot complex kinematic has been widely investigated for understanding the foot mechanism. This study aims to quantify the arthrokinematics on the mid-foot during normal walking by using a bi-planar fluoroscopic (BPF) system. Computed tomography images were acquired from eighteen healthy subjects to reconstruct three-dimensional (3D) models of the talus, calcaneus, navicular and cuboid. Bi-plane fluoroscopic images of the foot were taken during ground walking and 2D/3D registration was performed to quantify the arthrokinematics. Relative velocity vectors on articular surfaces were computed based on the movement of each bone to represent the interaction in the mid-foot joints. In terminal stance, the internal rotation and inversion patterns were observed in the subtalar and talo-navicular joints, respectively. Those rotational patterns were consistent between subjects and occurred at period of 80-90% of stance phase.