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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 3.0).

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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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