Title

Optimizing PTZ camera calibration from two images

Authors

Authors

I. N. Junejo;H. Foroosh

Comments

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Abbreviated Journal Title

Mach. Vis. Appl.

Keywords

Computer vision; Camera calibration; Pose estimation; PTZ camera; calibration; Given rotations; SELF-CALIBRATION; EUCLIDEAN RECONSTRUCTION; AUTOCALIBRATION; TILT; PAN; PARAMETERS; DISTORTION; SEQUENCES; MOTION; Computer Science, Artificial Intelligence; Computer Science, ; Cybernetics; Engineering, Electrical & Electronic

Abstract

In this paper, we address the problem of calibrating an active pan-tilt-zoom (PTZ) camera. In this regard, we make three main contributions: first, for the general camera rotation, we provide a novel solution that yields four independent constraints from only two images, by directly decomposing the infinite homography using a series of Givens rotations. Second, for a camera varying its focal length, we present a solution for the degenerate cases of pure pan and pure tilt that occur very frequently in practical applications of PTZ cameras. Third, we derive a new optimized error function for pure rotation or pan-tilt rotation, which plays a similar role as the epipolar constraint in a freely moving camera, in terms of characterizing the reprojection error of point correspondences. Our solutions and analysis are thoroughly validated and tested on both synthetic and real data, whereby the new geometric error function is shown to outperform existing methods in terms of accuracy and noise resilience.

Journal Title

Machine Vision and Applications

Volume

23

Issue/Number

2

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

375

Last Page

389

WOS Identifier

WOS:000302707100012

ISSN

0932-8092

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