Running head: Performance comparison of calibration algorithms Performance comparison of accelerometer calibration algorithms based on 3D-ellipsoid fitting methods Matthias Gietzelt 1 , Klaus-Hendrik Wolf 1 , Michael Marschollek 2 , and Reinhold Haux 1 1 Peter L. Reichertz Institute for Medical Informatics, University of Braunschweig – Institute of Technology and Hannover Medical School, Mühlenpfordtstr. 23, D-38106 Braunschweig, Germany Matthias Gietzelt, Matthias.Gietzelt@plri.de Dr. Klaus-Hendrik Wolf, Klaus-Hendrik.Wolf@plri.de Prof. Dr. Reinhold Haux, Reinhold.Haux@plri.de 2 Peter L. Reichertz Institute for Medical Informatics, University of Braunschweig – Institute of Technology and Hannover Medical School, Carl-Neuberg-Str. 1, D-30625 Hannover, Germany Prof. Dr. Dr. Michael Marschollek, Michael.Marschollek@plri.de Corresponding author: Matthias Gietzelt Keywords: calibration, non-iterative, accelerometer, ellipsoid fitting