Dimensional Optical Metrology and Inspection for Practical Applications
San Diego, CA
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.
Society of Photo-Optical Instrumentation Engineers
Ekstrand, Laura and Zhang, Song, "“Auto-exposure for 3D shape measurement with a digital fringe projection technique" (2011). Mechanical Engineering Conference Presentations, Papers, and Proceedings. 81.