2D wavelets are usually generated from 1D wavelets through the rectangular or through the square decomposition scheme. In this paper a new adaptive 2D decomposition scheme for compression related applications is presented. The adaptive 2D decomposition selects 2D wavelet functions&#x...

A new method for the evaluation of the bidirectional reflectance distribution function (BRDF) is presented. The proposed procedure foregoes the usage of special equipment like pohotogoniometers or imaging reflectometers but rather uses of-the-shelf hardware like CCD cameras. The BRDF is determine...

Drawing straight lines is a major field in computer graphics. Most methods are improvements of the Discrete Differential Analysis method first presented by Bresenham [1]. Combinatory analysis method, as presented by Castle [2] or Dulucq [3] or Berstel [4] are not commonly used: the...

Several clipping algorithms are in wide use. These are separated into broad classes. They include subdivision algorithms of which the best known is the midpoint subdivision algorithm; the Cohen-Sutherland algorithm which uses outcodes generators and line window intersection calculations to determ...

This paper describes an alternative approach to the hidden line problem in computer graphics. It is assumed that a 3D visible scene consisting of conver planar polygons with known visibility order is given. An abstract data structure together with a set of operation UNION is&#...

We present the concept of the FOCUS LINE, a new geometric distortion method designed to solve the problem of symbol cluttering in maps. FOCUS LINE´s utilise significant differences in the symbol density across the original map and distorts the layout to create the presentation ...

The challenging issue that is addressed here is the modelling of turbulent phenomena, physically consistant, and reactive at the same time. The aim is, first, to understand these phenomena in order to elaborate a particle-based dynamic model, capable of accounting for a certain num...

The basic reqirement for the functions of an Iterated Function System (IFS for shor) is contractivity. Nevertheless the majority of recent scientific investigations is concentrating on IFSs defined through a set of contractive linear functions. Simpler handling of this kind of functions ...

3D graphics had - and still has - not yet become a mainstream technology for everyday application and user interface development. The major reason being that software libraries available did not provide a programming model appropriate for widespread use by developers who are not&#x...

Virtual reality (VR) applications raise enormous interest inside and outside computer science. Unfortunately, VR systems are rather complex, involving many software and hardware modules being integrated. Theoretical papers are not always of much aid in the actual implementation of VR applications...

As a method for improving the scientific visual ability of students, the authors have used computer graphics based systems for student practice and the analysis of student responses. The final goal is to develop an effective instructional system by analyzing the underlying knowledge...

Today´s graphical user interfaces simulate a perfect world. Windows have always the same look and buttons have identical shapes and colors and are aligned to regular grids. The only distinction between graphical elements is their label. The current visual design of user interfaces ...

Algorithms for clipping lines against rectangular windows are nor mally implemented in object space using floating point arithmetic, and the resulting clipped lines are then scan converted to obtain their representation as a list of pixels in image space. Some algorithms av...

This paper introduces a new acceleration technique for the zonal method. We present mathematical developments which improve, in a considerable way, the time due to the form factor calculus. More precisely, we show that, under the assumption of classical modeling conditions, we can: ...