Spectral Gradient: A Material Descriptor Invariant to Geometry and Incident Illumination
Abstract
The light reflected from a surface depends on the scene geometry, the incident illumination and the surface material. A novel methodology is presented which extracts reflectivity information of the various materials in the scene independent of incident light and scene geometry. A scene is captured under different narrow-band color filters and the spectral derivatives of the scene are computed. The resulting spectral derivatives form a spectral gradient at each pixel. This spectral gradient is a material descriptor which is invariant to scene geometry and incident illumination for smooth diffuse surfaces. Spectral gradients can discriminate among smooth dielectrics with different reflectance properties independent of viewing conditions.
Cite
Text
Angelopoulou et al. "Spectral Gradient: A Material Descriptor Invariant to Geometry and Incident Illumination." IEEE/CVF International Conference on Computer Vision, 1999. doi:10.1109/ICCV.1999.790312Markdown
[Angelopoulou et al. "Spectral Gradient: A Material Descriptor Invariant to Geometry and Incident Illumination." IEEE/CVF International Conference on Computer Vision, 1999.](https://mlanthology.org/iccv/1999/angelopoulou1999iccv-spectral/) doi:10.1109/ICCV.1999.790312BibTeX
@inproceedings{angelopoulou1999iccv-spectral,
title = {{Spectral Gradient: A Material Descriptor Invariant to Geometry and Incident Illumination}},
author = {Angelopoulou, Elli and Lee, Sang Wook and Bajcsy, Ruzena},
booktitle = {IEEE/CVF International Conference on Computer Vision},
year = {1999},
pages = {861-867},
doi = {10.1109/ICCV.1999.790312},
url = {https://mlanthology.org/iccv/1999/angelopoulou1999iccv-spectral/}
}