Structured lighting for upgrading 2D vision systems to 3D

Henning G.E. Wolf

doi:10.1117/12.248593

26 August 1996 Structured lighting for upgrading 2D vision systems to 3D

Henning G.E. Wolf

Proceedings Volume 2787, Rapid Prototyping; (1996) https://doi.org/10.1117/12.248593
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

Abstract

In the industrial sector dimensional measurement within scenes of the order of one square meter is required. These measurements may be achieved with active structured lighting. Programmable optical grids can be projected directly on the surface of unpolished test-pieces in order to realize an absolute measurement method called 'coded light approach' to obtain a full depth-image, requiring only a small number of projections. In combination with the phase shifting method subpixel accuracy is achieved. Geometry- checking and controlling the surface quality of objects with mirror-like surfaces is put into practice with indirect illumination. Using a line-projector, stripes are projected to a diffusely reflecting surface, e.g. a wall. The test piece is positioned in a way that the lines are seen indirectly by the camera, reflected in the surface.

Citation Download Citation

Henning G.E. Wolf "Structured lighting for upgrading 2D vision systems to 3D", Proc. SPIE 2787, Rapid Prototyping, (26 August 1996); https://doi.org/10.1117/12.248593

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