Calibrating pan-tilt cameras with telephoto lenses

Authors:
Xinyu Huang;Jizhou Gao;Ruigang Yang
Affiliations:
Graphics and Vision Technology Lab, Center for Visualization and Virtual Environments, University of Kentucky;Graphics and Vision Technology Lab, Center for Visualization and Virtual Environments, University of Kentucky;Graphics and Vision Technology Lab, Center for Visualization and Virtual Environments, University of Kentucky
Venue:
ACCV'07 Proceedings of the 8th Asian conference on Computer vision - Volume Part I
Year:
2007

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Abstract

Pan-tilt cameras are widely used in surveillance networks. These cameras are often equipped with telephoto lenses to capture objects at a distance. Such a camera makes full-metric calibration more difficult since the projection with a telephoto lens is close to orthographic. This paper discusses the problems caused by pan-tilt cameras with long focal length and presents a method to improve the calibration accuracy. Experiments show that our method reduces the re-projection errors by an order of magnitude compared to popular homography-based approaches.