Special Section on High-Speed 3-D Optical Metrology and Applications

Array projection of aperiodic sinusoidal fringes for high-speed three-dimensional shape measurement

[+] Author Affiliations
Stefan Heist

Fraunhofer IOF, Albert-Einstein-Straße 7, 07745 Jena, Germany

Andreas Mann

Fraunhofer IOF, Albert-Einstein-Straße 7, 07745 Jena, Germany

Peter Kühmstedt

Fraunhofer IOF, Albert-Einstein-Straße 7, 07745 Jena, Germany

Peter Schreiber

Fraunhofer IOF, Albert-Einstein-Straße 7, 07745 Jena, Germany

Gunther Notni

Fraunhofer IOF, Albert-Einstein-Straße 7, 07745 Jena, Germany

Opt. Eng. 53(11), 112208 (May 01, 2014). doi:10.1117/1.OE.53.11.112208
History: Received January 29, 2014; Revised March 13, 2014; Accepted March 14, 2014
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Abstract.  Three-dimensional (3-D) measurement systems based on coded-light techniques are conventionally limited by the projection speed, which is typically in the range of a few 100 Hz, resulting in 3-D frame rates of 1 to 60 Hz. We propose to use an array projector for 3-D shape measurements, which enables much higher projection frame rates of up to the 100-kHz range. In contrast to previous setups, it does not project well-known phase-shifted sinusoidal fringes and Gray code patterns, but aperiodic sinusoidal fringes. This new technique, based on sine-shaped fringes with spatially and temporally varying offset, amplitude, period length, and phase shift, allows accurate 3-D measurement of objects, even with sharp edges, high slope, or varying surface properties, at high speed up to the kilohertz range. This paper explains the 3-D measurement principle and the basic design of an array projector that projects aperiodic sinusoidal fringes. It verifies the consistency between specified and projected patterns and points out the results of the setup’s characterization, e.g., of its high-speed capability. Furthermore, first 3-D shape measurements at a projection frame rate of 3 kHz resulting in a 3-D frame rate of >330Hz are presented and evaluated.

© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Stefan Heist ; Andreas Mann ; Peter Kühmstedt ; Peter Schreiber and Gunther Notni
"Array projection of aperiodic sinusoidal fringes for high-speed three-dimensional shape measurement", Opt. Eng. 53(11), 112208 (May 01, 2014). ; http://dx.doi.org/10.1117/1.OE.53.11.112208


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