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Proceedings Paper

New approaches for phase determination
Author(s): Jan Thesing
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Paper Abstract

Fringe projection and passive photogrammetry for measuring range to remote points are both based on triangulation. Applying the phase-shift technique to fringe projection, point clouds with high spatial resolution and limited accuracy can be generated. Because of the 1D phase information, the geometric sensor calibration is needed for object point determination. In photogrammetry, highly accurate image operators are applied in order to solve the problem of image correspondence for structures like circles, crosses or natural patterns with a limited spatial resolution. Based on the image point coordinates, object point determination can be performed as well as sensor calibrations. In this paper two approaches are presented to combine the advantages of both strategies. The image correspondence problem is solved by using projected fringes with different orientations. High spatial resolution is obtained by the phase-shifting technique. Systematical error sources like phase-shifting errors or nonsinusoidal waveforms will be eliminated by applying special algorithms in addition to a passive setup. Redundancy will be improved by increasing the number of sample points.

Paper Details

Date Published: 30 June 1998
PDF: 9 pages
Proc. SPIE 3478, Laser Interferometry IX: Techniques and Analysis, (30 June 1998); doi: 10.1117/12.312930
Show Author Affiliations
Jan Thesing, Technical Univ. of Braunschweig (Germany)

Published in SPIE Proceedings Vol. 3478:
Laser Interferometry IX: Techniques and Analysis
Malgorzata Kujawinska; Gordon M. Brown; Mitsuo Takeda, Editor(s)

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