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    Area of Science:

    • Optics and Material Science
    • Color Science

    Background:

    • Goniochromatic materials exhibit angle-dependent color, posing characterization challenges due to complex optical phenomena like diffraction and interference.
    • The bidirectional reflectance distribution function (BRDF) is a key metric for material optical property analysis.

    Purpose of the Study:

    • To evaluate an empirical goniochromatic BRDF model for highly specular and goniochromatic samples.
    • To enhance the model's accuracy for characterizing complex materials.

    Main Methods:

    • Utilized a handheld goniospectrophotometer for sample measurements.
    • Proposed a modification to the existing BRDF model by separating near-specular and diffuse reflectance components.

    Main Results:

    • The modified BRDF model demonstrated significantly improved performance.
    • Enhanced accuracy in representing and analyzing highly specular and goniochromatic materials was achieved.

    Conclusions:

    • The proposed separation of reflectance components enhances goniochromatic BRDF model accuracy.
    • This improved model offers better characterization of materials with angle-dependent color variations.