Optical Technique, Volume. 51, Issue 4, 504(2025)
Three-dimensional shape measurement of highly reflective objects based on adjusted projection intensity
Fringe projection profilometry is one of the most effective methods to obtain the three-dimensional (3D) shape of objects. However, when measuring highly reflective objects, more fringe images need to be projected, and the accuracy is not high. Therefore, a method for measuring the 3D shape of highly reflective objects based on adjusting projection intensity is proposed. First, the optimum projection intensity is calculated according to the surface coefficient of the object. Then, the coordinate correspondence between camera and projector is calculated according to the polar constraint and phase information,and the adaptive fringe is generated. Finally, the adaptive fringes are projected onto the surface of the object under test to achieve three-dimensional measurement of the object. The experimental results show that when measuring the steps of high reflective surfaces, the maximum absolute error is 0.0249 mm, which is 97.8% less than the method of single projection intensity, 18.6% less than the existing method of adjusting projection intensity, and the number of projected images is reduced by 18. The proposed method can reduce the number of projection fringes and improve the measurement accuracy.
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ZHAO Liwei, ZHANG Zonghua, FU Shuai, MENG Zhaozong, GAO Nan. Three-dimensional shape measurement of highly reflective objects based on adjusted projection intensity[J]. Optical Technique, 2025, 51(4): 504