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Increasing the Discrimination Power of Spectral Spatial Gradients

Daniel Berwick, Sang Wook Lee
CVPR 2001 pp. II:337-342
doi:10.1109/CVPR.2001.990980 /cvpr/2001/berwick2001cvpr-increasing/

Abstract

Spectral Spatial Gradients (SSGs) have been suggested as features invariant to illumination variation for color-based recognition and indexing. While SSGs have a greater degree of invariance than Spectral Gradients (SGs), they may have a reduced discrimination power between objects since they use only spatial changes of object reflectance. The approach presented is to use the framework of SGs and SSGs to create a recognition method which is invariant to varying illumination without discarding the reflectance distribution information. Two techniques are used to extract the varying illumination. The first is to assume that low-frequency SG variation is due to illumination. The second method uses regions with matching SSGs to get local estimates of illumination. Once the local illumination variation has been extracted, its effect on the SGs can be removed and the resulting Adapted Spectral Gradients (ASGs) have a greater power of discrimination for some objects than SSG features. Experimental results demonstrate cases where ASGs show improved performance.

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Cite

Text

Berwick and Lee. "Increasing the Discrimination Power of Spectral Spatial Gradients." IEEE/CVF Conference on Computer Vision and Pattern Recognition, 2001. doi:10.1109/CVPR.2001.990980

Markdown

[Berwick and Lee. "Increasing the Discrimination Power of Spectral Spatial Gradients." IEEE/CVF Conference on Computer Vision and Pattern Recognition, 2001.](https://mlanthology.org/cvpr/2001/berwick2001cvpr-increasing/) doi:10.1109/CVPR.2001.990980

BibTeX

@inproceedings{berwick2001cvpr-increasing,
  title     = {{Increasing the Discrimination Power of Spectral Spatial Gradients}},
  author    = {Berwick, Daniel and Lee, Sang Wook},
  booktitle = {IEEE/CVF Conference on Computer Vision and Pattern Recognition},
  year      = {2001},
  pages     = {II:337-342},
  doi       = {10.1109/CVPR.2001.990980},
  url       = {https://mlanthology.org/cvpr/2001/berwick2001cvpr-increasing/}
}