A phase unwrapping method based on multi-frequency heterodyne principle by projecting four different frequency fringes was deduced. Meanwhile, In order to reduce the phase unwrapping errors, a phase correction method was proposed, and the effect on matching result was compared before and after phase correction. In order to improve the accuracy of the matching, the revised absolute phase value was used as the basis for matching. Besides, the subpixel matching algorithm was utilized based on phase linear interpolation.Finally, the 3D reconstruction technology was used to obtain the three-dimensional point cloud. Results show that the matching rate of plane measurement is increased by 4.97%, with the measurement accuracy of 0.189 5 mm .
Key words
multi-frequency heterodyne /
three-dimensional measurement /
phase correction /
matching /
phase unwrapping
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References
[1]陈晓荣, 蔡萍, 施文康. 光学非接触三维形貌测量技术新进展[J]. 光学精密工程, 2002, 10(5):528-532.
CHEN Xiao-rong, CAI Ping, SHI Wen-kang New progress in non-contact optical measurement technology three-dimensional Morphology [J]. Optics and Precision Engineering, 2002, 10(5):528-532.(in Chinese with an English abstract)
[2]TOWERS C E, REID D T, MACPHERSON W N, et al. Fibre interferometer for multi-wavelength interferometry with a femtosecond laser [J]. Journal of Optics A: Pure and Applied Optics, 2005, 7(6): S415.
[3]YAMAGUCHI I, KATO J, MATSUZAKI H. Measurement of surface shape and deformation by phase-shifting image digital holography [J].Optical Engineering, 2003, 42(5): 1267-1271.
[4]李中伟. 基于数字光栅投影的结构光三维测量技术与系统研究 [D]. 武汉: 华中科技大学, 2009.
LI Zhong-wei. Three-dimensional measurement techniques and system research based on Digital projection optical grating [D].Wuhan: Huazhong
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Footnotes
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