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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
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Measuring isotropic subsurface light transport.

Kathrin Happel, Edgar Dörsam, Philipp Urban

    Optics Express
    |May 3, 2014
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new apparatus for measuring subsurface light transport, crucial for accurate color reproduction and rendering. The method uses a reference material and spectrally-resolved measurements to precisely determine the point spread function (PSF).

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    Area of Science:

    • Optics
    • Material Science
    • Computer Graphics

    Background:

    • Subsurface light transport significantly impacts material appearance.
    • Accurate measurement and modeling are vital for color reproduction and rendering translucent objects.

    Purpose of the Study:

    • To propose an apparatus for measuring subsurface light transport.
    • To enable spectrally-resolved measurements and accurate point spread function (PSF) reconstruction.

    Main Methods:

    • Developed an apparatus using a reference material to cancel bias signals.
    • Employed spectrally-narrowband exchangeable LEDs for spectrally-resolved measurements.
    • Utilized quadratic programming for PSF reconstruction in isotropic light transport.

    Main Results:

    • Derived a measurement equation to deduce the subsurface light transport PSF.
    • Achieved improved focusing on rough surfaces like uncoated paper.
    • Enabled spectrally-resolved PSF measurements.

    Conclusions:

    • The proposed apparatus and methods accurately measure subsurface light transport.
    • This facilitates precise color reproduction and realistic rendering of translucent materials.
    • The technique is particularly effective for rough surfaces.