Automatic tracing of interference fringes using Fourier filtering, local averaging and simultaneous horizontal and vertical scans

Arun Anand; Vani K. Chhaniwal

doi:10.1117/12.612417

13 June 2005 Automatic tracing of interference fringes using Fourier filtering, local averaging and simultaneous horizontal and vertical scans

Arun Anand, Vani K. Chhaniwal

Author Affiliations +

Proceedings Volume 5856, Optical Measurement Systems for Industrial Inspection IV; (2005) https://doi.org/10.1117/12.612417
Event: Optical Metrology, 2005, Munich, Germany

Abstract

Inteferograms are made by interfering wave fronts and hence contain important information about them. Analysis of interferogram requires the identification of all the fringes and their exterma. Here an algorithm for computer tracing of interference fringes is described. The method uses a Fourier filter for removing high frequency noise, a local averaging for binarization of images not having uniform intensity distribution, scanning the interferogram locally both horizontally and vertically to determine the type of the scan, local application of simultaneous horizontal and vertical scan for tracing of complicated fringe patterns and removal of the noise from the traces by determining the number of connected pixels. The poroposed algorithm was found to yield good result even for high noise images.

Citation Download Citation

Arun Anand and Vani K. Chhaniwal "Automatic tracing of interference fringes using Fourier filtering, local averaging and simultaneous horizontal and vertical scans", Proc. SPIE 5856, Optical Measurement Systems for Industrial Inspection IV, (13 June 2005); https://doi.org/10.1117/12.612417

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