Auto-exposure for 3D shape measurement using a DLP projector

Laura Ekstrand; Song Zhang

doi:10.1117/12.892492

9 September 2011 Auto-exposure for 3D shape measurement using a DLP projector

Laura Ekstrand, Song Zhang

Proceedings Volume 8133, Dimensional Optical Metrology and Inspection for Practical Applications; 813305 (2011) https://doi.org/10.1117/12.892492
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

Automatically adapting the camera exposure time is crucial for industrial applications where minimum human intervention is usually desirable. However, it is very challenging to realize such a capability for a conventional fringe projection system where only a finite increment of the exposure time is allowed due to its digital fringe generation nature. Our recent study on generating sinusoidal fringe patterns by properly defocusing binary ones permits the use of an arbitrary exposure time. This provides the potential to adapt the exposure time automatically. This paper will present the principle of an automatic exposure technique and show some experimental results.

Citation Download Citation

Laura Ekstrand and Song Zhang "Auto-exposure for 3D shape measurement using a DLP projector", Proc. SPIE 8133, Dimensional Optical Metrology and Inspection for Practical Applications, 813305 (9 September 2011); https://doi.org/10.1117/12.892492

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KEYWORDS

3D metrology

Projection systems

Cameras

Reflectivity

Binary data

Digital Light Processing

Fringe analysis

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