Artificial neural network approach for moiré fringe center determination

Wing Hon Woo; Mani Maran Ratnam; Kin Sam Yen

doi:10.1117/1.JEI.24.6.063021

24 December 2015 Artificial neural network approach for moiré fringe center determination

Wing Hon Woo, Mani Maran Ratnam, Kin Sam Yen

Author Affiliations +

Journal of Electronic Imaging, Vol. 24, Issue 6, 063021 (December 2015). https://doi.org/10.1117/1.JEI.24.6.063021

Abstract

The moiré effect has been used in high-accuracy positioning and alignment systems for decades. Various methods have been proposed to identify and locate moiré fringes in order to relate the pattern information to dimensional and displacement measurement. These methods can be broadly categorized into manual interpretation based on human knowledge and image processing based on computational algorithms. An artificial neural network (ANN) is proposed to locate moiré fringe centers within circular grating moiré patterns. This ANN approach aims to mimic human decision making by eliminating complex mathematical computations or time-consuming image processing algorithms in moiré fringe recognition. A feed-forward backpropagation ANN architecture was adopted in this work. Parametric studies were performed to optimize the ANN architecture. The finalized ANN approach was able to determine the location of the fringe centers with average deviations of 3.167 pixels out of 200 pixels (≈1.6%) and 6.166 pixels out of 200 pixels (≈3.1%) for real moiré patterns that lie within and outside the training intervals, respectively. In addition, a reduction of 43.4% in the computational time was reported using the ANN approach. Finally, the applicability of the ANN approach for moiré fringe center determination was confirmed.

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Wing Hon Woo, Mani Maran Ratnam, and Kin Sam Yen "Artificial neural network approach for moiré fringe center determination," Journal of Electronic Imaging 24(6), 063021 (24 December 2015). https://doi.org/10.1117/1.JEI.24.6.063021

Published: 24 December 2015

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