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Sensors 2013, 13(2), 2664-2681; doi:10.3390/s130202664

An Incremental Target-Adapted Strategy for Active Geometric Calibration of Projector-Camera Systems

*  and *
Department of Computer Science and Information Engineering, National University of Kaohsiung, 700, Kaohsiung University Rd. Nan Tzu Dist., Kaohsiung 811, Taiwan
* Authors to whom correspondence should be addressed.
Received: 11 January 2013 / Revised: 11 February 2013 / Accepted: 15 February 2013 / Published: 22 February 2013
(This article belongs to the Section Physical Sensors)
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The calibration of a projector-camera system is an essential step toward accurate 3-D measurement and environment-aware data projection applications, such as augmented reality. In this paper we present a two-stage easy-to-deploy strategy for robust calibration of both intrinsic and extrinsic parameters of a projector. Two key components of the system are the automatic generation of projected light patterns and the incremental calibration process. Based on the incremental strategy, the calibration process first establishes a set of initial parameters, and then it upgrades these parameters incrementally using the projection and captured images of dynamically-generated calibration patterns. The scene-driven light patterns allow the system to adapt itself to the pose of the calibration target, such that the difficulty in feature detection is greatly lowered. The strategy forms a closed-loop system that performs self-correction as more and more observations become available. Compared to the conventional method, which requires a time-consuming process for the acquisition of dense pixel correspondences, the proposed method deploys a homography-based coordinate computation, allowing the calibration time to be dramatically reduced. The experimental results indicate that an improvement of 70% in reprojection errors is achievable and 95% of the calibration time can be saved.
Keywords: projector-camera calibration; structured light; homography; closed-loop system projector-camera calibration; structured light; homography; closed-loop system
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Chen, C.-Y.; Chien, H.-J. An Incremental Target-Adapted Strategy for Active Geometric Calibration of Projector-Camera Systems. Sensors 2013, 13, 2664-2681.

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