NDLI: Estimating Camera Pose Using Trajectories Generated by Pan-Tilt Motion

Content Provider	IEEE Xplore Digital Library
Author	Nagayoshi, H. Pollefeys, M.
Copyright Year	2014
Description	Author affiliation: ETH Zurich, Zurich, Switzerland (Pollefeys, M.) \|\| Central Res. Lab., Hitachi Ltd., Yokohama, Japan (Nagayoshi, H.)
Abstract	A novel method for auto-calibration of a PTZ (pan-tilt-zoom) camera network is proposed. The key idea on which it is based is to use pan-tilt motions generated by PTZ cameras themselves as calibration patterns. Generating and observing the pan-tilt motions of each camera makes it possible to estimate whole relative camera poses in a camera network. Cameras first observe circular trajectories of a marker set on another camera performing tilt motions with various pan angles. Although finding correspondences between marker points captured by the cameras is cumbersome due to network delays, that of between circular trajectories is easy. It is thus possible to use several hundred points in a circular trajectory to estimate its normal vectors and centers with high accuracy. Imposing geometric constraints on them makes it possible to eliminate ambiguities of them and obtain a unique relative camera pose directly. A novel refinement process to minimize differences between modeled pan-tilt motions and three or more circular trajectories is then performed. Experiments using synthetic data confirmed that the refinement process improved camera pose estimation accuracy in comparison to the direct estimation. An experiment using real data showed that the proposed method works properly for real cameras.
Starting Page	561
Ending Page	568
File Size	351562
Page Count	8
File Format	PDF
ISBN	9781479970001
DOI	10.1109/3DV.2014.71
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-12-08
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Three-dimensional displays Camera Network Estimation Cameras Cost function Camera Pose Estimation Vectors Trajectory Calibration Ellipse Fitting Optimization
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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