Lambertian Correction for Rough and Specular Surfaces
| dc.contributor.author | Robles-Kelly, A. | en_US |
| dc.contributor.author | Hancock, E.R. | en_US |
| dc.contributor.editor | Peter Hall and Philip Willis | en_US |
| dc.date.accessioned | 2016-02-09T10:27:07Z | |
| dc.date.available | 2016-02-09T10:27:07Z | |
| dc.date.issued | 2003 | en_US |
| dc.description.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. | en_US |
| dc.description.sectionheaders | Texture and Surface Properties | en_US |
| dc.description.seriesinformation | Vision, Video, and Graphics (VVG) 2003 | en_US |
| dc.identifier.doi | 10.2312/vvg.20031029 | en_US |
| dc.identifier.isbn | 3-905673-54-1 | en_US |
| dc.identifier.pages | A. Robles-Kelly and E.R. Hancock-I.4.8 [Image Processing and Computer Vision]: Lambertian correction, BRDF approximation | en_US |
| dc.identifier.uri | https://doi.org/10.2312/vvg.20031029 | en_US |
| dc.publisher | The Eurographics Association | en_US |
| dc.subject | I.4.8 [Image Processing and Computer Vision] | en_US |
| dc.subject | Lambertian correction | en_US |
| dc.subject | BRDF approximation | en_US |
| dc.title | Lambertian Correction for Rough and Specular Surfaces | en_US |
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