Chair for Computer Aided Medical Procedures & Augmented Reality
Lehrstuhl für Informatikanwendungen in der Medizin & Augmented Reality

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T. Blum, T. Sielhorst, N. Navab
Advanced Augmented Reality Feedback for Teaching 3D Tool Manipulation
New Technology Frontiers in Minimally Invasive Therapies, 2007, pp. 223-236 (bib)

In this chapter we describe a novel technique for automatically providing elaborate feedback to AR/VR trainees. Our focus is on teaching 3D manipulation of tools in an AR enhanced simulator. Feedback is a critical part of any learning procedure. This is also true for VR and AR teaching systems. We propose a method for providing feedback without time consuming authoring of possible mistakes and advice on improvements. We have implemented the proposed method and show our first results. Since 3D movements cannot be trivially compared to each other the dynamic synchronization of expert and trainee performances is a crucial part of our system. Showing a synchronized replay of the expert and the trainee's movement, our system reveals differences without requiring the presence of the expert. Furthermore, we use synchronization for statistical analysis of several expert performances for averaging out unimportant variations in the manipulation path. We visualize the variance of expert movements and provide the trainee with appropriate feedback depending on such variance. The original publication is available at
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