Title : Towards Calibrating a Pan-Tilt-Zoom Camera Network

Paper ID: 18

Authors : Sudipta N. Sinha , Marc Pollefeys

Address : Department of Computer Science,
University of North Carolina at Chapel Hill
Chapel Hill, USA.

Email : {ssinha,marc}@cs.unc.edu

Abstract :

In this paper we discuss the problem of recovering the calibration of a
network of pan-tilt-zoom cameras. The intrinsic parameters of each camera over
its full range of zoom settings are estimated through a two step procedure. We
first determine the intrinsic parameters at the camera's lowest zoom setting
very accurately by capturing an extended panorama. Our model includes two
parameters of radial distortion. The camera intrinsics and radial distortion
parameters are then determined at discrete steps in a monotonically increasing
zoom sequence that spans the full zoom range of the cameras. Both steps are
fully automatic and do not assume any knowledge of the scene structure. We
validate our approach by calibrating two different types of pan tilt zoom
cameras placed in an outdoor environment. We also show the high-resolution
panoramic mosaics built from the images captured during this process. We
present an approach for accurate computation of the epipolar geometry based
on the full panorama instead of individual image pairs. Finally, we briefly
discuss how this can be used to compute the extrinsics for all the cameras
and how our approach can be used in the context of active camera networks.

Main Pdf File :
sinha_s.pdf

Additional Files :

Panoramic Images , Image sequences are present in the folder
sinha_s/additional/


[PDF]

---

Program