In this paper, we present a method that integrates cues from shading, shadow and specular reflections for estimating directional illumination in a textured scene. Texture poses a problem for lighting estimation, since texture edges can be mistaken for changes in illumination condition, and unknown variations in albedo make reflectance model fitting inpractical. Unlike previous works which all a...

A new model for the correction of topographic effects in satellite images of rough terrain is described. The model simulates a synthetic image of the scene using a computer graphics approach which combines ray-tracing techniques with radiosity methods. Computation is structured on three levels: a macro level in which the image is described by the Digital Elevation Model and the light source, a ...

A framework for photo-realistic view-dependent image synthesis of a shiny object from a sparse set of images and a geometric model is proposed. Each image is aligned with the 3D model and decomposed into two images with regards to the reflectance components based on the intensity variation of object surface points. The view-independent surface reflection (diffuse reflection) is stored as one te...

The goal of this study is to develop a complete set of data characterizing geometry, luminaires, and surfaces of a nontrivial existing environment for testing global illumination and rendering techniques. This paper briefly discusses the process of data acquisition. Also, the results of experiments on evaluating lighting simulation accuracy, and rendering fidelity for a Density Estimation Parti...

We examined whether perception of color saturation and lightness depends on the three-dimensional (3D) shape surface gloss surfaces rendered to have different hues. In Experiment 1, we parametrically varied specular roughness predominantly planar with mesoscopic relief heights. The orientation was relative light source observer. Observers matched perceived chroma (effectively saturation) using ...

The aim of this study was to evaluate the colorimetric properties of Pinus taeda and Schizolobium parahybum woods treated by in situ polymerization. The wood samples were impregnated in a vacuum/ pressure system and polymerized in an oven at 90°C for 10h, using benzoyl peroxide at 1,5wt% as the catalyst. The treatments were characterized using attenuated total reflectance infrared (ATRIR) spect...

1 Hougen and Ahuja This 1993 paper [2] is the first method to approach the multiple light source problem. It uses a combination of stereo, light source estimation, and shape from shading methods for determining the shape of objects. This summary will focus on the proposed light source estimation technique and it’s integration in the system. Four main assumptions are stated: 1. The light sources...

A new model for the correction of topographic effects in satellite images of rough terrain is described. The model simulates a synthetic image of the scene using a computer graphics approach which combines ray-tracing techniques with radiosity methods. Computation is structured on three levels: a macro level in which the image is described by the Digital Elevation Model and the light source, a ...

We propose a full reproduction workflow for printing color images on metallic substrates. It relies on an ink spreading enhanced cellular Yule-Nielsen modified spectral Neugebauer model, calibrated with 35 color samples printed on the metal film and measured under specular reflection. The calibration accounts for the different phenomena contributing to the reflectance of halftone prints on meta...