Fluctuation elimination of fringe pattern to improve the accuracy of phase calculation

Shujun Huang; Zonghua Zhang; Tong Guo; Sixiang Zhang; Xiaotang Hu

doi:10.1117/12.904846

28 November 2011 Fluctuation elimination of fringe pattern to improve the accuracy of phase calculation

Shujun Huang, Zonghua Zhang, Tong Guo, Sixiang Zhang, Xiaotang Hu

Proceedings Volume 8200, 2011 International Conference on Optical Instruments and Technology: Optoelectronic Imaging and Processing Technology; 82000I (2011) https://doi.org/10.1117/12.904846
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China

Abstract

3D fringe projection measurement techniques are increasingly important in production for automation, quality control, reversal engineering, and biomedical engineering because of the advantages of non-contact operation, full-field acquisition and automatic data processing. With the advent of DLP (Digital Light Processing) projectors, digital fringe pattern projection techniques have been widely studied in academia and applied to industries. The experimental data from living profile of fringe patterns show that the obtained intensity has some fluctuation, which cause the calculated phase data inaccuracy. This paper presents one software method to eliminate the fluctuation between fringe patterns. Four-step phase-shifting algorithm is used to calculate the wrapped phase data, so four fringe pattern images having pi/2 shift in between need to be captured. Because of the fluctuation of intensity, the captured fringe patterns have an up or down shift among the four images. By considering the histogram of each fringe pattern, we present one compensation method to eliminate the fluctuation between fringe patterns. Simulated data are first tested by generating fringe patterns with fluctuation. Then experimental data from a 3D imaging system demonstrate the validity for calculating the phase and shape information with high accuracy. The results show that the proposed method eliminates the fluctuation between fringe pattern images to give accurate shape data information.

Citation Download Citation

Shujun Huang, Zonghua Zhang, Tong Guo, Sixiang Zhang, and Xiaotang Hu "Fluctuation elimination of fringe pattern to improve the accuracy of phase calculation", Proc. SPIE 8200, 2011 International Conference on Optical Instruments and Technology: Optoelectronic Imaging and Processing Technology, 82000I (28 November 2011); https://doi.org/10.1117/12.904846

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KEYWORDS

Fringe analysis

Phase shifts

Digital Light Processing

Projection systems

3D metrology

Modulation

Phase shift keying

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