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Related Concept Videos

Methods of Obtaining Topography01:25

Methods of Obtaining Topography

Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
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In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
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Published on: February 12, 2014

Automatic shadow moiré topography: a moving-light-source method.

J S Lim, J Kim, M S Chung

    Optics Letters
    |September 18, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new method for real-time shadow moiré fringe analysis using fast Fourier transform. The technique accurately determines fringe order without needing continuous object surfaces.

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    Last Updated: Jun 20, 2026

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    Published on: May 20, 2013

    Area of Science:

    • Optics and Photonics
    • Metrology
    • Computer Vision

    Background:

    • Shadow moiré topography is a widely used technique for 3D surface measurement.
    • Determining the absolute order of moiré fringes is crucial for accurate measurements.
    • Existing methods often require object surface continuity or are computationally intensive.

    Purpose of the Study:

    • To develop an automated, real-time method for determining the absolute order of shadow moiré fringes.
    • To overcome limitations of existing shadow moiré fringe analysis techniques.
    • To enable accurate 3D surface reconstruction without requiring continuous object surfaces.

    Main Methods:

    • Analysis of intensity variations on an object surface caused by a moving light source.
    • Application of fast Fourier transform (FFT) methods for signal processing.
    • Real-time fringe order determination algorithm development.

    Main Results:

    • Successful automated, real-time determination of absolute shadow moiré fringe order.
    • Demonstrated applicability to shadow moiré topography.
    • The method does not require object surface continuity for accurate results.

    Conclusions:

    • The developed method offers an efficient and robust solution for shadow moiré fringe analysis.
    • This advancement facilitates more accessible and accurate 3D surface measurements.
    • The technique has potential applications in various fields requiring precise surface profiling.