20 June 2002 Histogram equalization of Young's fringes in speckle photography
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Young's fringes pattern in speckle photography is a distribution modulated by the diffraction halo. The halo, among other effects, limits countable number of fringes for the analysis. The fringes in the outer boundaries of the halo are buried in noise due to their diminishing maximum modulated intensity. We introduce here the application of histogram equalization to maximize countable number of fringes. We find that the usually decreasing halo intensity becomes uniform by the procedure. Consequently the fringe contrast throughout the pattern becomes practically constant rather than diminishing as we move to higher orders in the halo. Results with experimental patterns are described to establish the usefulness of the procedure.
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Tushar Singh, Chandra S. Vikram, "Histogram equalization of Young's fringes in speckle photography", Proc. SPIE 4777, Interferometry XI: Techniques and Analysis, (20 June 2002); doi: 10.1117/12.472246; https://doi.org/10.1117/12.472246

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