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Automatic processing in moiré deflectometry by local fringe direction calculation.

H Canabal, J A Quiroga, E Bernabeu

    Applied Optics
    |February 21, 2008
    PubMed
    Summary
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    This study presents an algorithm for extracting local fringe direction from optical patterns. The method accurately maps refractive power in ophthalmic lenses, offering a valuable tool for fringe analysis.

    Area of Science:

    • Optics and Photonics
    • Image Processing
    • Ophthalmic Optics

    Background:

    • Accurate fringe pattern analysis is crucial for optical metrology.
    • Existing methods may struggle with variable fringe directions and noise.
    • Moiré deflectometry is a powerful technique for lens characterization.

    Purpose of the Study:

    • To develop and validate an algorithm for precise local fringe direction extraction.
    • To assess the algorithm's performance with different derivative kernels.
    • To apply the algorithm to ophthalmic lenses and compare results with a commercial focimeter.

    Main Methods:

    • An algorithm estimates gradient direction normal to local fringe direction within an n x n neighborhood.
    • Preprocessing steps mitigate noise, background, and amplitude variations.

    Related Experiment Videos

  • The algorithm was applied to moiré deflectograms of spherical and progressive addition lenses.

    • Main Results:

    • A map of refractive power was generated for ophthalmic lenses.
    • The algorithm successfully extracted local fringe directions in complex patterns.
    • Results showed good agreement when compared to data from a commercial focimeter.

    Conclusions:

    • The developed algorithm accurately extracts local fringe direction.
    • This technique is effective for analyzing fringe patterns with variable directions.
    • It provides a reliable method for mapping refractive power in ophthalmic lenses.