| Autor: |
Sang Wook Lee, Ruzena Bajcsy, Elli Angelopoulou |
| Rok vydání: |
1999 |
| Předmět: |
|
| Zdroj: |
ICCV |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
