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Proceedings Paper

Fast Fourier transform method for shadow moire fringe pattern analysis
Author(s): Sidney A. Guralnick; Eric S. Suen; G. Jin
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Paper Abstract

An image system using the shadow moire method for the quantitative inspection of highway pavement surface has been developed. Studies have shown that a single moire image is ordinarily not sufficient to yield complete information about the gradient of a set of contour lines pertaining to a particular area of surface. The pavement surface reconstruction algorithm that has been developed to date uses two moire interferograms of any point on the surface to obtain overlapping information to correctly measure elevation. In this paper, a fast Fourier transform (FFT) method is described which generates accurate surface topographical information from a single interferogram. The fast Fourier transform used in conjunction with the shadow moire technique provides the basis for an automated pavement survey system now under development. This new approach is expected to significantly decrease system hardware and processing time requirements for an automated pavement survey system.

Paper Details

Date Published: 1 August 1992
PDF: 8 pages
Proc. SPIE 1778, Imaging Technologies and Applications, (1 August 1992); doi: 10.1117/12.130970
Show Author Affiliations
Sidney A. Guralnick, Illinois Institute of Technology (United States)
Eric S. Suen, Illinois Institute of Technology (United States)
G. Jin, Illinois Institute of Technology (United States)

Published in SPIE Proceedings Vol. 1778:
Imaging Technologies and Applications
Robert J. Heaston, Editor(s)

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