Lambertian Correction for Rough and Specular Surfaces

Robles-Kelly, A.; Hancock, E.R.

Lambertian Correction for Rough and Specular Surfaces

Files

29_cameraready.pdf (2.76 MB)

Date

2003

Authors

Robles-Kelly, A.
Hancock, E.R.

Publisher

The Eurographics Association

Abstract

This paper describes a method for performing Lambertian reflectance for rough and specular surfaces. Rather than using an existing reflectance model, we present a method for estimating the reflectance function from image data. The method makes use of the Gauss map between a surface and a unit sphere. Under conditions in which the light source direction and the viewer direction are identical, we show how the reflectance function can be represented by a polar function on the unit sphere. We pose the problem of recovering the reflectance function as that of estimating a tabular representation of the polar function. A simple analysis shows how the tabular representation of the reflectance function can be obtained using the accumulative distribution of image gradients. By modifying the reflectance function and back-projecting, we can render the surface with alternative lighting models. Here, we choose to back-project a Lambertian reflectance model. This allows us to be remove specularities from shiny surfaces and compensate from boundary ''flattening'' for rough surfaces. We illustrate the utility of the method on a variety of real world imagery.

        @inproceedings{10.2312:vvg.20031029
,
booktitle = {Vision, Video, and Graphics (VVG) 2003
},
editor = {Peter Hall and Philip Willis
},
title = {{Lambertian Correction for Rough and Specular Surfaces
}},
author = {Robles-Kelly, A. and 
Hancock, E.R.
},
year = {2003
},
publisher = {The Eurographics Association
},
ISBN = {3-905673-54-1
},
DOI = {10.2312/vvg.20031029
}
}