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A Convenient Multi-Camera Self-Calibration for Virtual Environments
Type of publication: Article
Citation: SvobodaPresence2005
Journal: PRESENCE: Teleoperators and Virtual Environments
Volume: 14
Number: 4
Year: 2005
Month: August
Pages: 407-422
Publisher: The MIT Press
Address: Cambridge MA
ISSN: 1054-7460
Userfields: annote={Virtual immersive environments or telepresence setups often consist of multiple cameras which have to be calibrated. We present a convenient method for doing this. The minimum is three cameras, but there is no upper limit. The method is fully automatic and a freely moving bright spot is the only calibration object. A set of virtual 3D points is made by waving the bright spot through the working volume. Its projections are found with sub-pixel precision and verified by a robust RANSAC analysis. The cameras do not have to see all points, only reasonable overlap between camera subgroups is necessary. Projective structures are computed via rank-4 factorization and the Euclidean stratification is done by imposing geometric constraints. This linear estimate initializes a post-processing computation of non-linear distortion which is also fully automatic. We suggest a trick on how to use a very ordinary laser pointer as the calibration object. We show that it is possible to calibrate an immersive virtual environment with 16 cameras in less than 30 minutes reaching about 1/5 pixel reprojection error. The method has been successfully tested on numerous multi-camera environments with a varying number and quality of cameras used.}, authorship={60-30-10}, date-added={2012-09-25 09:54:31 +0200}, date-modified={2012-09-25 09:54:31 +0200}, project={fremdliteratur},
Keywords: camera calibration, camera dome, multicamera calibration, selfcalibration, virtual room
Authors Svoboda, T.
Martinec, D.
Pajdla, T.