In this work, we investigate the visual appearance of real-world surfaces and the dependence of appearance on the geometry of imaging conditions. We discuss a new texture representation called the BTF (bidirectional texture function) which captures the variation in texture with illumination and viewing direction. We present a BTF database with image textures from over 60 different samples, each...

Bidirectional Associative Memories (BAM) based on Kosko’s model are implemented through iterative algorithms and present stability problems. Also, these models along with other models based on different methods, have not been able to perfectly recall all trained patterns. In this paper we present an English-Spanish / Spanish-English translator based on a new BAM model denominated Alpha-Beta BAM...

The present investigation describes a method for sampling bidirectional reflectance information from multiangular airborne images. The method uses high resolution surface models in the determination of the location of the imaged point on the ground and in the image, and finally the orientation of the measured surface fragment. Two test sites were imaged with a wide range of azimuth angles at tw...

This paper presents a new method for theoretical stability analysis of a bidirectional dual full bridge DC-DC converter with triple phase-shift control. The developed approach is analytically sound and generally applicable when compared with the existing approaches, which are by and large based on computer simulation. The operating process of a bidirectional converter is multi-stage and nonline...

A unique aspect of integrin receptor function is the transmission of bidirectional signals. In platelets alphaIIbbeta3 integrins require "inside-out" signals to bind fibrinogen and form thrombi. Following ligand binding, alphaIIbbeta3 integrins generate "outside-in" signals that contribute to thrombus stability. Because integrin cytoplasmic tails are short and lack enzymatic activity, bidirecti...

Bidirectional reflectance distribution function provides a physical description of material appearance. In particular, it helps to describe the gloss. We suggest that, at least, one attribute of gloss: Contrast gloss (luster), may be described directly from an image by using local image contrast measurement. In this article, we investigate the relation between image contrast measures, gloss per...

An analysis of one of the approaches to cloth modeling is carried out in this paper. The real 3D structure of the cloth at micro level is considered and the lighting simulation with the accuracy control is provided. The simulation result in BSDF form is a full description of optical properties of the cloth sample. It allows us to produce the “far view” of the cloth accurately and fast.

The recent rise of interest in bidirectional transformations (BXs) has led to the development of many BX frameworks, originating in diverse computer science disciplines. From a user perspective, these frameworks vary significantly in both interface and predictability of the underlying bidirectionalization technique. In this paper we start by presenting a generic BX scheme that can be instantiat...

Measuring reflection properties of a 3D object involves capturing images for numerous viewing and lighting directions. We present a method to select advantageous measurement directions based on analyzing the estimation of the bi-directional reflectance distribution function (BRDF). The selected directions minimize the uncertainty in the estimated parameters of the BRDF. As a result, few measure...