3D shape measurement method based on the triangle pattern

Guoli Qu; Chao Huang; Yanjun Fu; Bin Qian; Fuwei Wang

doi:10.1117/12.2267787

8 March 2017 3D shape measurement method based on the triangle pattern

Guoli Qu, Chao Huang, Yanjun Fu, Bin Qian, Fuwei Wang

Proceedings Volume 10255, Selected Papers of the Chinese Society for Optical Engineering Conferences held October and November 2016; 102550Q (2017) https://doi.org/10.1117/12.2267787
Event: Selected Papers of the Chinese Society for Optical Engineering Conferences held October and November 2016, 2016, Jinhua, Suzhou, Chengdu, Xi'an, Wuxi, China

Abstract

Binary pattern defocused projection is a promising method of measuring 3D shapes. However, deep or long-distance defocus prevents high-accuracy 3D measurement. The triangle pattern is preferred because of its slight defocus and ability to overcome the nonlinear gamma. Thus, a novel method combining triangle pattern slight defocus with phase shifting is proposed. The proposed method has two merits: (1) Compared with the sinusoidal pattern, the proposed method can overcome the nonlinear gamma. (2) Compared with the binary pattern, it has the advantage of slightly defocusing to an ideal sinusoidal pattern in a short distance. Thus, the measurement error caused by nonlinear gamma and deep defocus is reduced. The RMS error of the proposed method is <0.03 mm. Theory analysis and experiments demonstrate the feasibility and superiority of the proposed method.

Citation Download Citation

Guoli Qu, Chao Huang, Yanjun Fu, Bin Qian, and Fuwei Wang "3D shape measurement method based on the triangle pattern", Proc. SPIE 10255, Selected Papers of the Chinese Society for Optical Engineering Conferences held October and November 2016, 102550Q (8 March 2017); https://doi.org/10.1117/12.2267787

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KEYWORDS

3D metrology

Binary data

Projection systems

Gaussian filters

CCD cameras

Fringe analysis

Phase shifts

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