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Multispectral imaging colorimetric measurement method with illumination-adaptive white calibration.

Yue Yuan, Ruoduan Sun, Xufen Xie

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |August 12, 2025
    PubMed
    Summary

    This study introduces a novel multispectral imaging method for accurate non-contact color measurement of curved surfaces. The developed system significantly reduces color errors, enhancing precision for complex objects.

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    Area of Science:

    • Color Science
    • Optical Engineering
    • Computer Vision

    Background:

    • Accurate color measurement of non-planar surfaces is challenging due to uncontrolled lighting and surface scattering.
    • Existing non-contact methods struggle with complex geometries and variable illumination conditions.

    Purpose of the Study:

    • To develop a multispectral imaging colorimetric measurement method for non-planar surfaces.
    • To improve the accuracy and standardization of non-contact color measurements.
    • To create a device capable of uniform illumination and adaptive white calibration.

    Main Methods:

    • Spectral reconstruction using a backpropagation neural network.
    • Illumination-adaptive white calibration and spectral fusion techniques.
    • A custom device with an integrating sphere, an 8-channel multispectral camera, and a rotating table coated with PTFE for calibration.

    Main Results:

    • Reduced average reconstruction error from 2.4 to 1.5 CIEDE2000 color difference units after PTFE data correction.
    • Maintained color measurement deviation (ΔE00) below 2 across various angles for glossy curved surfaces.
    • Demonstrated superior accuracy compared to conventional point light sources for glossy objects.

    Conclusions:

    • The proposed method provides uniform, stable diffuse lighting for precise non-contact color analysis.
    • The integration of digital imaging with spectroscopy offers a powerful tool for accurate color measurement.
    • The developed device and method are effective for measuring complex objects like porcelain exhibits.