In fringe projection, the CCD camera and the projector are often placed at equal height. In this paper, we will study the calibration of an unequal arrangement of the CCD camera and the projector. The principle of fringe projection with two-dimensional digital image correlation to acquire the profile of object surface is described in detail. By formula derivation and experiment, the linear relationship between the out-of-plane calibration coefficient and the y coordinate is clearly found. To acquire the three-dimensional (3D) information of an object correctly, this paper presents an effective calibration method with linear least-squares fitting, which is very simple in principle and calibration. Experiments are implemented to validate the availability and reliability of the calibration method.
© 2011 Optical Society of America
Instrumentation, Measurement, and Metrology
Original Manuscript: October 27, 2010
Revised Manuscript: February 10, 2011
Manuscript Accepted: February 11, 2011
Published: April 6, 2011
Feipeng Zhu, Hongjian Shi, Pengxiang Bai, and Xiaoyuan He, "Three-dimensional shape measurement and calibration for fringe projection by considering unequal height of the projector and the camera," Appl. Opt. 50, 1575-1583 (2011)