Repeatable speckle projector for single-camera three-dimensional measurement

Andreas Stark; Eugene Wong; Daniel Weigel; Holger Babovsky; Richard Kowarschik

doi:10.1117/1.OE.57.12.120501

13 December 2018 Repeatable speckle projector for single-camera three-dimensional measurement

Andreas Stark, Eugene Wong, Daniel Weigel, Holger Babovsky, Richard Kowarschik

Author Affiliations +

Optical Engineering, Vol. 57, Issue 12, 120501 (December 2018). https://doi.org/10.1117/1.OE.57.12.120501

Abstract

Triangulation-based three-dimensional (3-D) optical metrology utilizing structured illumination requires the projector and camera to be geometrically calibrated. The projection of laser speckle structures in temporal correlation-based methods has been found to be useful for high-speed 3-D measurement. However, it requires the use of a stereo-camera configuration as speckle projection does not utilize conventional projection optics. Previously, we have shown a model-less method to calibrate these unconventional projection systems. This re-enabled single-camera setups where stereo systems used to be required. Due to the random nature of speckle production, speckle structures were not suitable as a set of repeatable illumination structures is needed for the model-less calibration method to succeed. A projection apparatus is proposed, which enables the production of a repeatable set of speckle structures. This device is then utilized in a single-camera optical metrology 3-D measurement system.

Citation Download Citation

Andreas Stark, Eugene Wong, Daniel Weigel, Holger Babovsky, and Richard Kowarschik "Repeatable speckle projector for single-camera three-dimensional measurement," Optical Engineering 57(12), 120501 (13 December 2018). https://doi.org/10.1117/1.OE.57.12.120501

Received: 23 October 2018; Accepted: 28 November 2018; Published: 13 December 2018

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available