Real-time image-based RGB-D camera motion tracking and environment mapping. (Suivi de caméra image en temps réel base et cartographie de l'environnement)

Tommi M. Tykkälä Real-time Image-based RGB-D Camera Motion Tracking and Environment Mapping Helsinki, 2013 148 p. Acta Universitatis Lappeenrantaensis 533 Diss. Lappeenranta University of Technology ISBN 978-952-265-473-1 ISBN 978-952-265-474-8 (PDF) ISSN 1456-4491, ISSN-L 1456-4491 In this work, image based estimation methods, also known as direct methods, are studied which avoid feature extraction and matching completely. Cost functions use raw pixels as measurements and the goal is to produce precise 3D pose and structure estimates. The cost functions presented minimize the sensor error, because measurements are not transformed or modified. In photometric camera pose estimation, 3D rotation and translation parameters are estimated by minimizing a sequence of image based cost functions, which are non-linear due to perspective projection and lens distortion. In image based structure refinement, on the other hand, 3D structure is refined using a number of additional views and an image based cost metric. Image based estimation methods are particularly useful in conditions where the Lambertian assumption holds, and the 3D points have constant color despite viewing angle. The goal is to improve image based estimation methods, and to produce computationally efficient methods which can be accomodated into real-time applications. The developed image-based 3D pose and structure estimation methods are finally demonstrated in practise in indoor 3D reconstruction use, and in a live augmented reality application.