Calibration of Central Catadioptric Cameras Using a DLT-Like Approach

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Puig L., Bastanlar Y., Sturm P., Guerrero J. J., Barreto J.

INTERNATIONAL JOURNAL OF COMPUTER VISION, vol.93, no.1, pp.101-114, 2011 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 93 Issue: 1
  • Publication Date: 2011
  • Doi Number: 10.1007/s11263-010-0411-1
  • Journal Name: INTERNATIONAL JOURNAL OF COMPUTER VISION
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.101-114
  • Keywords: Omnidirectional vision, Camera calibration, Lifted coordinates, Structure from motion, Central catadioptric systems
  • Middle East Technical University Affiliated: Yes

Abstract

In this study, we present a calibration technique that is valid for all single-viewpoint catadioptric cameras. We are able to represent the projection of 3D points on a catadioptric image linearly with a 6x10 projection matrix, which uses lifted coordinates for image and 3D points. This projection matrix can be computed from 3D-2D correspondences (minimum 20 points distributed in three different planes). We show how to decompose it to obtain intrinsic and extrinsic parameters. Moreover, we use this parameter estimation followed by a non-linear optimization to calibrate various types of cameras. Our results are based on the sphere camera model which considers that every central catadioptric system can be modeled using two projections, one from 3D points to a unitary sphere and then a perspective projection from the sphere to the image plane. We test our method both with simulations and real images, and we analyze the results performing a 3D reconstruction from two omnidirectional images.