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Augmented reality camera tracking with homographies

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3 Author(s)
Prince, S.J.D. ; Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore ; Ke Xu ; Cheok, A.D.

To realistically integrate 3D graphics into an unprepared environment, camera position must be estimated by tracking natural image features. We apply our technique to cases where feature positions in adjacent frames of an image sequence are related by a homography, or projective transformation. We describe this transformation's computation and demonstrate several applications. First, we use an augmented notice board to explain how a homography, between two images of a planar scene, completely determines the relative camera positions. Second, we show that the homography can also recover pure camera rotations, and we use this to develop an outdoor AR tracking system. Third, we use the system to measure head rotation and form a simple low-cost virtual reality (VR) tracking solution.

Published in:

Computer Graphics and Applications, IEEE  (Volume:22 ,  Issue: 6 )

Date of Publication:

Nov/Dec 2002

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