Please use this identifier to cite or link to this item:
|Title:||Reflectance modeling for a textured object under uncontrolled illumination from high dynamic range maps|
Modeling and recovery of physical attributes
|Source:||Hu, G.H., Ong, S.K., Chen, Y.P., Nee, A.Y.C. (2007-04). Reflectance modeling for a textured object under uncontrolled illumination from high dynamic range maps. Computers and Graphics (Pergamon) 31 (2) : 262-270. ScholarBank@NUS Repository. https://doi.org/10.1016/j.cag.2007.01.002|
|Abstract:||During the past several years, considerable work has been presented on the methods for measuring and modeling the observed reflectance properties of materials. However, most of these works have been done under controlled lighting configurations, and require a constant bidirectional reflectance distribution function (BRDF), which is a measure of the amount of light scattered by a medium from one direction into another, or a homogeneous material over the object regions. This paper discusses a method to estimate the reflectance properties of a textured object under uncontrolled illumination. Assuming that the object has a constant specular reflectance property over its surface, the BRDF can be approximated as a constant specular component and a spatially varying diffuse component. The proposed method will first approximate the illumination distribution of a scene from a set of high dynamic range (HDR) radiance maps of a light probe. Next, a patch on the surface of an object is selected; several HDR intensity maps of the patch taken under different viewing conditions are used to estimate the average specular reflectance parameters of this patch. With the separation of the specular component and the diffuse component of each sample, and using the separated diffuse component, the diffuse reflectance parameters for each point over the surface are next estimated. The test results show that the method is effective for textured objects with constant specular reflectance properties. The method can also be directly applied to objects with piecewise-smooth material, which means that although the surface of an object does not have a constant specular reflectance property; when sub-divided into many smaller meshes, the specular parameter of each mesh can be regarded as uniform. © 2007 Elsevier Ltd. All rights reserved.|
|Source Title:||Computers and Graphics (Pergamon)|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Feb 26, 2018
WEB OF SCIENCETM
checked on Feb 26, 2018
checked on Feb 25, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.