Fast Fourier transform method for shadow moire fringe pattern analysis

Sidney A. Guralnick; Eric S. Suen; G. Jin

doi:10.1117/12.130970

1 August 1992 Fast Fourier transform method for shadow moire fringe pattern analysis

Sidney A. Guralnick, Eric S. Suen, G. Jin

Proceedings Volume 1778, Imaging Technologies and Applications; (1992) https://doi.org/10.1117/12.130970
Event: Optical Engineering Midwest 1992, 1992, Chicago, IL, United States

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.

Citation Download Citation

Sidney A. Guralnick, Eric S. Suen, and G. Jin "Fast Fourier transform method for shadow moire fringe pattern analysis", Proc. SPIE 1778, Imaging Technologies and Applications, (1 August 1992); https://doi.org/10.1117/12.130970

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