The polarization of electromagnetic radiation reflected by a particulate surface is determined by a four by four reflection matrix. Symmetry relations are quite common for such reflection matrices. The reciprocity and mirror symmetry relations are combined to derive a third symmetry relation. These three relations are used to simplify reflection matrices for a variety of special directions of i...

A new surface radiance model for diffuse lighting is presented which incorporates shadows, interreflections, and surface orientation. An algorithm is presented that uses this model to compute shape-from-shading under diffuse lighting. The algorithm is tested on both synthetic and real images, and is found to perform more accurately than the only previous algorithm for this problem.

We present a systematic study of GX 339-4 in both its very high and low hard states from simultaneous observations made with XMM-Newton and RXTE in 2004 and 2006. The X-ray spectra of both these extreme states exhibit strong reflection signatures, with a broad, skewed Fe-Kα line clearly visible above the continuum. Using a newly developed, self-consistent reflection model which implicitly inclu...

The outstanding characteristic of the Shroud image is the discontinuous distribution of the color on the surface. Color appears predominantly on the highest parts of the threads in the weave, as can be seen from the excellent photomicrographs taken by Mark Evans of STURP. Copies of Evans' collection are available from the Shroud web site (www.shroud.com). I would especially recommend ME-029, a ...

The paper analyzes territorial modernization and the importance of the urban phenomenon for recent changes in the Amazon Region. Using the notions of “forest towns” and “towns in the forest”, this paper intends to understand diffuse urbanization, which is in progress, in a regional context. With this focus, it considers examples of urban forms and attributes regarding provisions for external ec...

In this paper we describe an efficient approach to add shadows to volumetric scenes. The light emitted by the lightsource is properly attenuated by the intervening volumetric structures before it is reflected towards the eye. Both parallel and perspective lightsources can be efficiently and accurately modeled. We use a two-stage splatting approach. In the first stage, a light volume is construc...

We present a novel robust methodology for corresponding a dense set of points on an object surface from photometric values, for 3-D stereo computation of depth. We use two stereo pairs of images, each pair taken of exactly the same scene but under different illumination. By respectively dividing the left images and the right images of these pairs, a stereo pair of photometric ratio images is pr...

This paper presents a work in progress aiming at the solution of the diffuse radiosity problem, i.e. a Fredholm type integral equation, on the graphics hardware.

We present a new approach to diffuse reflectance estimation for dynamic scenes. Non-parametric image statistics are used to transfer reflectance properties from a static example set to a dynamic image sequence. The approach allows diffuse reflectance estimation for surface materials with inhomogeneous appearance, such as those which commonly occur with patterned or textured clothing. Material e...