A three-dimensional imaging system for industrial applications with improved flexibility and robustness

Procedures developed to enhance the flexibility and the robustness of an optical whole-field profilometer are presented. The system is based on the projection of structured light and on active triangulation. In order to comply with a sufficiently wide typology of targets, three different techniques to perform light coding have been integrated on the system, each one followed by a specific triangulation algorithm, which accounts for the influence of the system's crossed-optical-axes geometry. In order to guarantee a sufficient robustness and simplicity of use, the system has been equipped with a procedure for the automatic determination of the measurement parameters, both geometrical and optical, as well as for the necessary image preprocessing. The developed procedures increase the measurement performance both in terms of resolution and of extension of the measurement range, and keep the complexity of the system compatible with its use in the industrial field.

[1]  M. Altschuler,et al.  Laser Electro-Optic System For Rapid Three-Dimensional (3-D) Topographic Mapping Of Surfaces , 1981 .

[2]  M. Takeda,et al.  Fourier transform profilometry for the automatic measurement of 3-D object shapes. , 1983, Applied optics.

[3]  Ray A. Jarvis,et al.  A Perspective on Range Finding Techniques for Computer Vision , 1983, IEEE Transactions on Pattern Analysis and Machine Intelligence.

[4]  M Rioux,et al.  Laser range finder based on synchronized scanners. , 1984, Applied optics.

[5]  V. Srinivasan,et al.  Automated phase-measuring profilometry: a phase mapping approach. , 1985, Applied optics.

[6]  Y. Y. Hung,et al.  Fast profilometer for the automatic measurement of 3-D object shapes. , 1990, Applied optics.

[7]  Pierre Boulanger.  Reverse engineering of complex surfaces based on a new hierarchical segmentation method , 1993, Other Conferences.

[8]  U. Minoni,et al.  A novel, adaptive system for 3-D optical profilometry using a liquid crystal light projector , 1994 .

[9]  Xianyu Su,et al.  Two-dimensional Fourier transform profilometry for the automatic measurement of three-dimensional object shapes , 1995 .

[10]  Sara Lazzari,et al.  Development and characterization of a 3D measuring system based on integration of gray code and phase-shift light projection , 1997, Electronic Imaging.

[11]  G. Sansoni,et al.  Three-dimensional imaging based on Gray-code light projection: characterization of the measuring algorithm and development of a measuring system for industrial applications. , 1997, Applied optics.

[12]  Q Fang,et al.  Linearly coded profilometry. , 1997, Applied optics.

[13]  Paul J. Besl,et al.  Active, optical range imaging sensors , 1988, Machine Vision and Applications.