
Proceedings Paper
Real-time 3D shape recording by DLP-based all-digital surface encodingFormat | Member Price | Non-Member Price |
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Paper Abstract
The use of computer generated sinusoidal fringe patterns has found wide acceptance in optical metrology. There are
corresponding software solutions that reconstruct the phase field encoded in the fringe pattern in order to get 3D-shape
data via triangulation and deflection measuring setups, respectively. Short recording time is a common issue of high
importance for all tasks on the factory shop floor as well as in medical applications and for security. Recent high-speed
implementations take advantage of MEMS based spatial light modulators and the digital micro mirror chipset DLP
DiscoveryTM* is the fastest proven component currently available for this aim. Being a bi-stable on-off-state system, the
sinusoidal gray level pictures are generated by controlling the mirrors ON-time period during which an analogue
detector is exposed. This digital generation of light intensity distributions provides outstanding precision and long-term
stability. It is used in leading edge technology solutions that produce video type streams of 3D surface data with a
sustained repetition rate of 40 Hz. A new proposal is discussed in this paper that goes beyond this state of the art by
considering the optical encoding of the surface as an all-digital communication link. After a brief classification of state-of-
the-art systems, the authors describe how future all-digital encoding leads to extremely high speed and precision in
3D shape acquisition.
Paper Details
Date Published: 14 February 2009
PDF: 8 pages
Proc. SPIE 7210, Emerging Digital Micromirror Device Based Systems and Applications, 72100E (14 February 2009); doi: 10.1117/12.807573
Published in SPIE Proceedings Vol. 7210:
Emerging Digital Micromirror Device Based Systems and Applications
Larry J. Hornbeck; Michael R. Douglass, Editor(s)
PDF: 8 pages
Proc. SPIE 7210, Emerging Digital Micromirror Device Based Systems and Applications, 72100E (14 February 2009); doi: 10.1117/12.807573
Show Author Affiliations
Roland Höfling, ViALUX GmbH (Germany)
Petra Aswendt, ViALUX GmbH (Germany)
Published in SPIE Proceedings Vol. 7210:
Emerging Digital Micromirror Device Based Systems and Applications
Larry J. Hornbeck; Michael R. Douglass, Editor(s)
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