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Updated: Sep 5, 2025

Applying Hyperspectral Reflectance Imaging to Investigate the Palettes and the Techniques of Painters

Applying Hyperspectral Reflectance Imaging to Investigate the Palettes and the Techniques of Painters

Published on: June 18, 2021

Measuring High Dynamic Range Spectral Reflectance of Artworks through an Image Capture Matrix Hyperspectral Camera.

Ángela Gómez Manzanares¹, Daniel Vázquez Moliní¹, Antonio Alvarez Fernandez-Balbuena¹

¹Department of Optics, University Complutense of Madrid, 28040 Madrid, Spain.

Sensors (Basel, Switzerland)

|July 9, 2022

Summary

This summary is machine-generated.

This study introduces a novel hyperspectral imaging system using multiple cameras and filters to capture high dynamic range (HDR) spectral reflectance. This HDR approach enhances colorimetric accuracy and reduces measurement uncertainty for artwork analysis.

Keywords:

artwork filter matrix high dynamic range hyperspectral image spectral reflectance

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Last Updated: Sep 5, 2025

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Area of Science:

Optics and Photonics
Imaging Science
Art Conservation Science

Background:

Commercial hyperspectral imaging systems often use CCD or CMOS sensors with limited dynamic range.
Non-linear sensor responses and uncontrolled lighting lead to underexposed or saturated areas in hyperspectral images.
Accurate spectral reflectance measurement of artworks is crucial for conservation and analysis.

Purpose of the Study:

To develop and validate a high dynamic range (HDR) hyperspectral imaging system.
To overcome the limitations of dynamic range in conventional hyperspectral imaging systems.
To improve the accuracy and reduce uncertainty in spectral reflectance measurements of artworks.

Main Methods:

A novel system comprising twelve spectral filters and twelve cameras was developed.
The system captures multiple images at different exposure times to construct an HDR image.
Calibration procedures and a specific algorithm were implemented for HDR spectral reflectance measurement.

Main Results:

The developed system successfully acquired HDR spectral reflectance measurements.
Validation using Spectralon Reflectance Standards showed improved accuracy compared to low dynamic range methods.
HDR hyperspectral imaging demonstrated a significant decrease in measurement uncertainty.

Conclusions:

The developed HDR hyperspectral imaging system effectively overcomes dynamic range limitations.
The system provides more accurate spectral reflectance measurements for evaluating artworks.
This technology offers a valuable tool for art conservation and scientific analysis.