Title :
A representation of specular appearance
Author :
Lin, Stephen ; Lee, Sang W.
Author_Institution :
Michigan Univ., Ann Arbor, MI, USA
Abstract :
The appearance of an object can vary considerably with changes in illumination conditions. Methods have been developed to describe these differences for diffuse reflection using the Lambertian model, but little work has been done in characterizing specular appearance. Towards a more comprehensive global reflectance descriptor, this paper focuses on a representation of specular appearance based on an approximate specular reflection model derived from Torrance-Sparrow. We propose that under certain illumination and surface conditions local specular structure can be expressed by the logarithms of three intensity-normalized photometric images. The total number of photometric images needed for representing global specular appearance depends on the object surface roughness, and we suggest an illumination planning method for determining the number of images. Experimental results demonstrate the effectiveness of this logarithmic model as a specular descriptor
Keywords :
image representation; illumination planning; object surface roughness; representation; specular appearance; specular reflection model; Application software; Computer vision; Electrical capacitance tomography; Identity-based encryption; Lighting; Optical reflection; Photometry; Read only memory; Reflectivity; Shape;
Conference_Titel :
Computer Vision, 1999. The Proceedings of the Seventh IEEE International Conference on
Conference_Location :
Kerkyra
Print_ISBN :
0-7695-0164-8
DOI :
10.1109/ICCV.1999.790310