21 March 1997 Development and characterization of a 3D measuring system based on integration of gray code and phase-shift light projection
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Abstract
In this paper, a 3D measurement procedure is presented, which combines the gray code light projection technique and the phase shift method. The aim is the improvement of the performance of a 3D imaging system based on structured light projection. The measuring procedure based on gray code light projection demonstrates the ability of measuring objects presenting marked discontinuities of shape, such as steep slopes, grooves and holes: the experimental tests performed show that the measurement accuracy is up to 0.42% and the precision is 0.3% of the measuring range. The accuracy of the measurement is mainly limited by its resolution. To increase the system performances, the ability of the phase shift method to achieve higher resolution has been used: the height values given by these two methods are combined in a procedure which shows increased resolution and accuracy on an extended measuring range. The basic aspects of the two basic techniques for 3D imaging and profiling are here discussed. The combined procedure which integrates them is detailed, and some relevant experimental results are reported.
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Giovanna Sansoni, Giovanna Sansoni, Sara Lazzari, Sara Lazzari, Matteo Carocci, Matteo Carocci, Franco Docchio, Franco Docchio, } "Development and characterization of a 3D measuring system based on integration of gray code and phase-shift light projection", Proc. SPIE 3023, Three-Dimensional Image Capture, (21 March 1997); doi: 10.1117/12.269751; https://doi.org/10.1117/12.269751
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