Joachim Diepstraten

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This paper describes how technical illustrations containing opaque and non-opaque objects can be automatically generated. Traditional methods to show transparency in manual drawings are evaluated to extract a small and effective set of rules for computer-based rendering of technical illustrations, leading to a novel view-dependent transparency model. We(More)
In this paper we present a new system that assists blind users in orienting themselves in indoor environments. We developed a sensor module that can be handled like a flashlight by a blind user and can be used for searching tasks within the three-dimensional environment. By pressing keys, inquiries concerning object characteristics, position, orientation(More)
There is a growing interest for providing interactive graphics also on mobile devices like PDAs, Smartphones, etc. Right now mobile devices are very limited concerning graphical resources basically only simple 2D rasterization operations are available, that run completely on the main CPU of the device. The desire to have more complex 3D graphics on these(More)
With the advent of generic remote visualization solutions , accessing distant graphics resources from the desk-top is no longer restricted to specially tailored applications. However, current solutions still suffer from poor in-teractivity due to limited network bandwidth and high la-tency. In this paper we present several improvements to our remote(More)
In this paper we present a concept for a wide-ranging indoor navigation support for the blind and people with impaired vision. Parts of this work were realized within a new prototype of an indoor navigation and object identification system for the blind. With the previous orientation assistant it is possible for blind persons to orientate themselves and to(More)
We present an algorithm for the visualization of trees during the passing of the year, taking into account the changing and vanishing of the tree's leaves as well as their color changes. In combination with the Phong lighting algorithm the color changes are directly integrated into the lighting model. In conjunction with the use of common off the shelf(More)
Children and adults often find it difficult to learn basic foreign language vocabulary through conventional teaching methods. This is especially true for blind learners, who lack the benefit of environmental cues. While sighted individuals gain valuable information by noting the position of objects and their association with other objects (e.g., clock on(More)
In this paper, a system is proposed which can automatically generate 2+1D Minkowski diagrams. We show how these spacetime diagrams reveal more aspects of special relativity than traditional Minkowski diagrams and can therefore further enhance the understanding of special relativity. The interactive system is based on Java3D and can be used as a widely(More)