The concept of generalized trihedral vertex (GTV) is proposed for 3d object representation. The concept covers not only polygonal objects but also curved objects including rounded edges and rounded corners. An effective algorithm is shown for matching two GTVs, one of which is constructed from stereoscopic images and the other of which is precompiled in the G T I database. Finally, we construct...

Hyperspectral anomaly detection is one of the main challenging topics in both military and civilian fields. The spectral information contained in a hyperspectral cube provides a high ability for anomaly detection. In addition, the costly spatial information of adjacent pixels such as texture can also improve the discrimination between anomalous targets and background. Most studies miss the wort...

The rapid developments in the field of online threedimensional (3D) virtual worlds have considerable impact on education activities. Therefore, the 3D designers and teachers start to consider the interaction between design and usability of 3D virtual learning spaces as essential tool for educational systems. For the purpose of our research, a virtual learning space was created as a chemistry cl...

This paper presents the LivingRoom platform for online socialization within the 3D virtual space. The user is represented by an avatar that is moving around the virtual space and can communicate with other avatars. The audio and video communication among avatars is triggered by their interactions similarly with the human action within the real world. Author

We propose a novel method to probe the depth structure of the pictorial space evoked by paintings. The method involves an exocentric pointing paradigm that allows one to find the slope of the geodesic connection between any pair of points in pictorial space. Since the locations of the points in the picture plane are known, this immediately yields the depth difference between the points. A set o...

In this article, global-in-time dispersive estimates and Strichartz estimates are explored for the wave equation on three dimensional hyperbolic space. Due to the negative curvature, extra dispersion is noted, as compared to the Euclidean case, and a wider range of Strichartz estimates are proved. Using these, small data global existence to semilinear wave equations is shown for a range of powe...

The contribution of technology to the teaching and learning of geometry is perceived to be strongly linked with interactivity, multiple interlinked representations, including symbolic ones, dynamic manipulations, and dynamic visualizations (Laborde et al. 2006). However, relatively little research has been carried out on the way the above distinct characteristics of digital media can be exploit...

Di erent isohedral tilings of the Euclidian Space are studied in this paper. Using the Voronoi zone in various lattices, we derived toroidal shapes that interlink with each other to ll space completely. The tile of main interest was the 3-segment ring-tile, for which we found several linear approximations.

The orientation space transform is a concept that can deal with multiple oriented structures at a single location. In this paper we extend the orientation space transform to 3D images producing a 5D orientation space (x, y, z, φ, θ). We employ a tunable, orientation selective quadrature filter to detect edges and planes and a separate filter for detecting lines. We propose a multi-resolution sa...

In this paper we present Shoggoth, a 3D graphics based program for performing network music. In Shoggoth, users utilize video game style controls to navigate and manipulate a grid of malleable height maps. Sequences can be created by defining paths through the maps which trigger and modulate audio playback. With respect to a context of computer music performance, and specific problems in networ...