This paper presents a new technique for rendering caustics on non Lambertian surfaces The method is based on an extension of the photon map which removes previous restrictions limiting the usage to Lambertian surfaces We add information about the incoming direction to the photons and this allows us to combine the photon map with arbitrary re ectance functions Furthermore we introduce ba lancing...

Weizmann Institute of Science, Technical Report MCS00-21 NEC Research Institute Technical Report 2000-172R Ronen Basri David Jacobs Dept. of Computer Science NEC Research Institute The Weizmann Institute of Science 4 Independence Way Rehovot, 76100 Israel Princeton, NJ 08540 Abstract We prove that the set of all re ectance functions (the mapping from surface normals to intensities) produced by ...

We prove that the set of all Lambertian reflectance functions (the mapping from surface normals to intensities) obtained with arbitrary distant light sources lies close to a 9D linear subspace. This implies that, in general, the set of images of a convex Lambertian object obtained under a wide variety of lighting conditions can be approximated accurately by a low-dimensional linear subspace, ex...

Beautiful darks in bright light. That's another way of saying that reflections from the display surface are under control. Perhaps we will see advertisements like this in the future. However, such a description is vague unless the reflection properties are clearly indicated. If we were to only state the familiar diffuse and specular reflection properties, would the specifications be adequate? N...

This paper presents a novel scheme for locating multiple light sources and estimating their intensities from a pair of stereo images of a sphere. No prior knowledge of the location and radius of the sphere is necessary. The sphere surface is not assumed to be a pure Lambertian surface, instead, it has both Lambertian and specular properties. The light source locating algorithm is based on the f...

The photometric sampling method [4] extracts shape and reflectance properties of surfaces (Lambertian, specular, and hybrid) by using multiple illunrination directions and a single viewing direction. This paper describes a complete implementation and a performance evaluation of a three-dimensional version of the photometric sampler. The experimental conducted on Lambertian surfaces, specular su...

Visual perception is a challenging problem in part due to illumination variations. A possible solution is to first estimate an illumination invariant representation before using it for recognition. The object albedo and surface normals are examples of such representations. In this paper, we introduce a multilayer generative model where the latent variables include the albedo, surface normals, a...