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Proceedings Paper

High-resolution ultrafast 3D imaging
Author(s): Janos Rohaly; Douglas P. Hart
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Paper Abstract

A novel high-speed 3D imaging system, base don projecting a speckle pattern onto an object and imaging the resulting pattern from multiple angles, is proposed that uses a unique single lens camera system with a rotating off-axis aperture. The rotating aperture allows adjustable non-equilateral spacing between defocused images to achieve greater depth of field and higher sub-pixel displacement accuracy. High resolution ultra fast processing is achieved by recursively correlating image pairs down to diffraction limited image size of the optics. Correlation errors are eliminated during processing by a novel technique based on the multiplication of correlation table elements from one or more adjacent regions. The Gaussian nature of the projected speckle pattern is used to reveal image disparity to sub-pixel accuracy. Processing is accomplished by compressing the images into sparse array format before they are correlated. This system is ideally suited for hardware implementation and circumvents many of the inherent limitations of multi- camera system using FFT spectral based correlation.

Paper Details

Date Published: 16 March 2000
PDF: 9 pages
Proc. SPIE 3958, Three-Dimensional Image Capture and Applications III, (16 March 2000); doi: 10.1117/12.380028
Show Author Affiliations
Janos Rohaly, Massachusetts Institute of Technology (United States)
Douglas P. Hart, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 3958:
Three-Dimensional Image Capture and Applications III
Brian D. Corner; Joseph H. Nurre, Editor(s)

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