ABSTRACT
Separation of the diffuse and specular components of observed reflectance has been an active area of research in computer graphics and vision, with major applications in reflectance modeling and scene analysis. Traditionally, researchers have investigated diffusespecular separation under point or directional illumination conditions while employing polarization and, in the case of dielectric materials, color space analysis techniques. Recently, Ma et al. [2007] introduced a technique for estimating high quality diffuse and specular normals and albedo maps (see Fig. 1, (a) & (d)) of a specular object using polarized spherical gradient illumination. However, the employed polarization technique imposes view-point restriction, and results in insufficient light levels for performance capture with high speed acquisition. Hence, in this work, we look into an alternate diffuse-specular separation technique for spherical gradients based on a data-driven reflectance model. Traditional separation techniques based on color space analysis focus on removing specular reflections from the observation for scene analysis [Mallick et al. 2005]. In contrast, we focus on obtaining high quality estimates of both the diffuse and the specular reflectance components.
- Ma, W.-C., Hawkins, T., Peers, P., Chabert, C.-F., Weiss, M., and Debevec, P. 2007. Rapid acquisition of specular and diffuse normal maps from polarized spherical gradient illumination. In Rendering Techniques, 183--194. Google ScholarDigital Library
- Mallick, S. P., Zickler, T. E., Kriegman, D. J., and Belhumeur, P. N. 2005. Beyond lambert: Reconstructing specular surfaces using color. In Proc. IEEE Conf. Computer Vision and Pattern Recognition. Google ScholarDigital Library
Index Terms
Data-driven diffuse-specular separation of spherical gradient illumination
Recommendations
Diffuse-specular separation using binary spherical gradient illumination
SR '18: Proceedings of the Eurographics Symposium on Rendering: Experimental Ideas & ImplementationsWe introduce a novel method for view-independent diffuse-specular separation of albedo and photometric normals without requiring polarization using binary spherical gradient illumination. The key idea is that with binary gradient illumination, a ...
Rapid acquisition of specular and diffuse normal maps from polarized spherical gradient illumination
EGSR'07: Proceedings of the 18th Eurographics conference on Rendering TechniquesWe estimate surface normal maps of an object from either its diffuse or specular reflectance using four spherical gradient illumination patterns. In contrast to traditional photometric stereo, the spherical patterns allow normals to be estimated ...
Estimating specular roughness from polarized second order spherical gradient illumination
SIGGRAPH '09: SIGGRAPH 2009: TalksMeasurement of spatially varying BRDFs of real world materials has been an active area of research in computer graphics with image-based measurements being the preferred approach in practice. In order to restrict the total number of measurements, ...
Comments