Complex Freeform Surface Measurement Based on Stereo Vision and Digital Phase-Shifting Techniques

Abstract:

In this paper, a method combining stereo vision and digital phase-shifting techniques is presented, which can measure the profile of complex freeform surfaces expeditiously and accurately. A chessboard is used to determine the camera parameters for the camera calibration of the system and the epipolar line rectification is executed based on the stereo calibration result. The stereo matching is processed with the combination of four-step phase-shifting and Gray code techniques, and the maximum probability method is proposed to remove the fringe order confusion problem between Gray code and phase shifting measurement. Bilinear interpolation method is also adopted to improve the speed and accuracy of stereo matching. Experiments were carried out with measuring a step gauge block and a shoe last model. Experimental results show that the measurement can be completed within 3 s for a measuring region of 640 mm × 480 mm, and the average measurement error is less than 0.054 mm.

• Periodical: Applied Mechanics and Materials (Volumes 284-287)
• Pages: 623-628
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.284-287.623
• Online since: January 2013
• Authors: Jun Yi Lin, Kai Yong Jiang, Ming Chang, Yen Yu Wang
• Keywords: Epipolar Line Rectification, Gray Code, Phase-Shifting, Stereo Vision

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