IEEE Transactions on Pattern Analysis and Machine Intelligence
Spectral gradients for color-based object recognition and indexing
Computer Vision and Image Understanding - Special issue on color for image indexing and retrieval
Color texture measurement and segmentation
Signal Processing - Special section on content-based image and video retrieval
Color-stripe structured light robust to surface color and discontinuity
ACCV'07 Proceedings of the 8th Asian conference on Computer vision - Volume Part II
The invariance properties of chromatic characteristics
PSIVT'06 Proceedings of the First Pacific Rim conference on Advances in Image and Video Technology
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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.