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

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K. Pentenrieder
Tracking Scissors using retro-reflective Lines.
Diploma Thesis, Technical University Munich, Munich, Germany, January 2005 (bib)

Tracking plays an important role in Augmented Reality (AR) applications. In medical augmented reality, tracking systems must allow to accurately determine the position of medical instruments without influencing or disturbing the surgeons working environment. Retro-reflective material combined with infrared light presents an interesting and promising method of optical tracking. This thesis analyzes the special case of tracking medical scissors using retro-reflective lines. The particular structure of this instrument permits its identification in an image only through the position of the two legs. During this project the whole process of image generation, line detection, camera calibration and 3D reconstruction via line triangulation was examined. The used methods, problems and undertaken optimizations are presented here. Furthermore some ideas for the part of tracking the instrument over a series of images are briefly discussed.
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