“Photometric Stereo for Archeological Inscriptions” by Einarsson, Debevec and Hawkins
Conference:
Type(s):
Title:
- Photometric Stereo for Archeological Inscriptions
Session/Category Title: Art and Architecture
Presenter(s)/Author(s):
Abstract:
We describe a low-cost system for acquiring high-resolution geometry and reflectance properties using photometric stereo. This technique was used to model ancient inscriptions on the Parthenon in Athens, Greece and proved to be fast, simple and robust.
The principle of photometric stereo [Woodham 1980] is to take three or more images of an object from the same camera view, each with lighting from a different, known direction. Based on the brightness values in the different images, one can estimate a surface normal and a reflectance value by solving the following equation at each pixel:
References:
Malzbender, T., Gelb, D., and Wolters, H. 2001. Polynomial texture maps. Proceedings of SIGGRAPH 2001 (August), 519–528.
Rushmeier, H., and Bernardini, F. 1999. Computing consistent normals and colors from photometric data. In Proc. of the Second Intl. Conf. on 3D Digital Imaging and Modeling – 3DIM’99, 99–108.
Woodham, R. J. 1980. Photometric method for determining surface orientation from multiple images. Optical Engineering 19, 1, 139–144.
