Temporal Illumination Variation Compensation Using Perpendicular Whisk-Broom Hyperspectral Scans

A breakthrough method compensates for sunlight variability in outdoor hyperspectral imaging, preserving high-fidelity spectral data of cultural artifacts. By employing two orthogonal scans—one perpendicular to the traditional row-wise whisk-broom scan—the approach effectively mitigates temporal illumination fluctuations, even when additional scans coincide with black frames. The compensation is optimized using logarithmic space modeling and total variation penalization, ensuring smoothness while reducing acquisition time without sacrificing quality. Applied to Amiens Cathedral's stained-glass windows, this technique offers a robust solution for analyzing heritage sites under dynamic lighting conditions.

Kessy, S. J., Funatomi, T., Kushida, T., Kitano, K., Fujimura, Y., Caron, G., Mouaddib, E. M., & Mukaigawa, Y. (2026). Temporal Illumination Variation Compensation Using Perpendicular Whisk-Broom Hyperspectral Scans. Computational Visual Media, 12(3), 721–741. https://doi.org/10.26599/cvm.2025.9450453