Due to the spread of mobile handheld devices, new application fields like technical maintenance and mechanical inspections open up to their use. Yet, to fully benefit from their modern technical capabilities, standard interaction techniques need to be revised and new ways of accessing the abundance of technical documentation on the handheld need to be conceived. However, the display of technica...

This paper is an introduction to non-photorealistic volume rendering and shall give an overview of the terms used and the main concepts. Recently the focus of research has concentrated on photorealistic rendering of 3D volume datasets. To overcome the constraints of photorealistic visualization new methods were found using nonphotorealistic rendering techniques. We present a comprehensible intr...

Stream reduction is the process of removing unwanted elements from a stream of outputs. It is a key component of many GPGPU algorithms, especially in multi-pass algorithms: the stream reduction is used to remove unwanted elements from the output of a previous pass before sending it as input for the next pass. In this paper, we present a new efficient algorithm for stream reduction on the GPU. O...

WE are very excited about the fact that extended versions of three outstanding papers from the Ninth Eurographics/IEEE VGTC Symposium on Visualization (EuroVis ’07) have been invited to this special section of IEEE Transactions on Visualization and Computer Graphics (TVCG). EuroVis ’07 took place in Norrköping, Sweden, from the 23rd to the 25th of May 2007 and it was in many ways a success. A r...

There is ample evidence that instruction in spatial visualization skills is effective in improving outcomes for engineering students. Research conducted since the early 1990’s has proven that spatial visualization practice and training leads to better grades in engineering graphics and in most other engineering coursework. Other studies demonstrate that improved 3D visualization skills improve ...

Quantization index modulation (QIM) is widely used in watermarking, but QIM cannot be applied to reversible watermarking directly due to its inherent limitations. In this paper, an improvement is made to QIM to make it suitable for reversible watermarking. Based on the improved QIM (IQIM), a reversible watermarking scheme for 2D CAD engineering graphics is proposed. The relative amplitudes and ...

This paper describes the FADE paradigm for visualization and a series of experiments for the fast layout, abstract representation, and measurement of software views. In program comprehension, graph models are typically used to represent relational information, where the visualization of such graphs is referred to as graph drawing. Here we present the results of an investigation into efficient t...

We describe an analogical method for constructing a structural model from an unlabelled 2D line drawing. The source case is represented as a schema that contains its 2D line drawing, the lines and intersections in the drawing, the shapes in drawing, and the structural model of the device depicted in the drawing. Given a target drawing and a relevant source case, our method first constructs a gr...

This paper attempts to bridge the languages of traditional technical graphics and scientific data visualization. A theoretical structure for guiding the generation and description of scientific visualizations is proposed. Examples are given as to how this structure can be used to generate visualizations of ÔsystemsÕ that might be explored by a scientist, engineer, or technician. Finally, how th...

Analysis of user clickstreams on the world wide web is made challenging by the volume of data and the difficulty of visualizing millions of different navigation paths. We present a method for identifying user clickpaths which scales well on large amounts of data, and provides an intuitive and insightful visual representation of user activity. Our technique borrows from the data mining literatur...