1 August 1988 Application Of Moire Analysis Of Strain Using Fourier Transform
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Optical Engineering, 27(8), 278650 (1988). doi:10.1117/12.7976737
By shifting the discrete Fourier spectrum of the image of a deformed grating, we obtain the "complex moire pattern," from which strain distribution is given as the derivatives of the phases of the complex moire fringes. The analysis is completely automated by digital image processing. All of the laborious and subjective procedures required in the conventional analysis such as fringe sign determination, fringe ordering, and fringe interpolation are thus eliminated, permitting objective, fast, and accurate analysis. Some applications for rubber plates are shown.
Yoshiharu Morimoto, Yasuyuki Seguchi, Toshihiko Higashi, "Application Of Moire Analysis Of Strain Using Fourier Transform," Optical Engineering 27(8), 278650 (1 August 1988). http://dx.doi.org/10.1117/12.7976737

Moire patterns

Fourier transforms

Fringe analysis

Digital image processing

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