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Proceedings Paper

Direct calibration methodology for stereo cameras
Author(s): Yongtae Do; Seog-Hwan Yoo; Dae-Sik Lee
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Paper Abstract

This paper describes a new technique for stereoscopic 3D position measurement. By defining stereo cameras as a system for image-to-world mapping, the mapping function is determined. The direct representation of 3D coordinates of a world point with corresponding stereo image coordinates is derived using the pin-hole model. One camera frame is related to the other before being related to the world frame so that the stereo itself rather than each camera can be directly related with the 3D world. The equations obtained are simple, straightforward, and closed-form. However, since the nonlinearity of actual imaging system is not considered, high accuracy is difficult to be expected when the equation is employed for 3D measurements. For tackling this problem a multilayer feedforward neural network trained by back- propagation algorithm is used. The network played the role of fine correction satisfactorily using its function learning capability after rough mapping by the linear equations in our experiment.

Paper Details

Date Published: 6 October 1998
PDF: 12 pages
Proc. SPIE 3521, Machine Vision Systems for Inspection and Metrology VII, (6 October 1998); doi: 10.1117/12.326987
Show Author Affiliations
Yongtae Do, Taegu Univ. (South Korea)
Seog-Hwan Yoo, Taegu Univ. (South Korea)
Dae-Sik Lee, Taegu Univ. (South Korea)


Published in SPIE Proceedings Vol. 3521:
Machine Vision Systems for Inspection and Metrology VII
Bruce G. Batchelor; John W. V. Miller; Susan Snell Solomon, Editor(s)

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