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Displaying 1-24 out of 24 total
A Systematic Review on the Practice of Evaluating Visualization
Found in: IEEE Transactions on Visualization and Computer Graphics
By Tobias Isenberg,Petra Isenberg,Jian Chen,Michael Sedlmair,Torsten Moller
Issue Date:December 2013
pp. 2818-2827
We present an assessment of the state and historic development of evaluation practices as reported in papers published at the IEEE Visualization conference. Our goal is to reflect on a meta-level about evaluation in our community through a systematic under...
 
Sketchy Rendering for Information Visualization
Found in: IEEE Transactions on Visualization and Computer Graphics
By Jo Wood,Petra Isenberg,Tobias Isenberg,Jason Dykes,Nadia Boukhelifa,Aidan Slingsby
Issue Date:December 2012
pp. 2749-2758
We present and evaluate a framework for constructing sketchy style information visualizations that mimic data graphics drawn by hand. We provide an alternative renderer for the Processing graphics environment that redefines core drawing primitives includin...
 
FI3D: Direct-Touch Interaction for the Exploration of 3D Scientific Visualization Spaces
Found in: IEEE Transactions on Visualization and Computer Graphics
By Lingyun Yu, Pjotr Svetachov, Petra Isenberg, Maarten H. Everts, Tobias Isenberg
Issue Date:November 2010
pp. 1613-1622
We present the design and evaluation of FI3D, a direct-touch data exploration technique for 3D visualization spaces. The exploration of three-dimensional data is core to many tasks and domains involving scientific visualizations. Thus, effective data navig...
 
A Developer's Guide to Silhouette Algorithms for Polygonal Models
Found in: IEEE Computer Graphics and Applications
By Tobias Isenberg, Bert Freudenberg, Nick Halper, Stefan Schlechtweg, Thomas Strothotte
Issue Date:July 2003
pp. 28-37
<p>Generating object silhouettes lies at the heart of nonphotorealism and is needed for many styles of rendering. This article describes, categorizes, discusses, and recommends algorithms for computing the silhouette of a polygonal model, thus guidin...
 
Reimagining the Scientific Visualization Interaction Paradigm
Found in: Computer
By Daniel F. Keefe,Tobias Isenberg
Issue Date:May 2013
pp. 51-57
The technological building blocks are in place to address six major challenges for natural visualization interfaces to enable an exciting future where natural interfaces powerfully strengthen and expand the use of visualizations in science, engineering, ar...
 
Evaluating Sketchiness as a Visual Variable for the Depiction of Qualitative Uncertainty
Found in: IEEE Transactions on Visualization and Computer Graphics
By Nadia Boukhelifa,Anastasia Bezerianos,Tobias Isenberg,Jean-Daniel Fekete
Issue Date:December 2012
pp. 2769-2778
We report on results of a series of user studies on the perception of four visual variables that are commonly used in the literature to depict uncertainty. To the best of our knowledge, we provide the first formal evaluation of the use of these variables t...
 
A Systematic Review on the Practice of Evaluating Visualization
Found in: IEEE Transactions on Visualization and Computer Graphics
By Tobias Isenberg,Petra Isenberg, Jian Chen,Michael Sedlmair,Torsten Moller
Issue Date:December 2013
pp. 2818-2827
We present an assessment of the state and historic development of evaluation practices as reported in papers published at the IEEE Visualization conference. Our goal is to reflect on a meta-level about evaluation in our community through a systematic under...
 
Depth-Dependent Halos: Illustrative Rendering of Dense Line Data
Found in: IEEE Transactions on Visualization and Computer Graphics
By Maarten H. Everts, Henk Bekker, Jos B.T.M. Roerdink, Tobias Isenberg
Issue Date:November 2009
pp. 1299-1306
We present a technique for the illustrative rendering of 3D line data at interactive frame rates. We create depth-dependent halos around lines to emphasize tight line bundles while less structured lines are de-emphasized. Moreover, the depth-dependent halo...
 
Measuring Stipple Aesthetics in Hand-Drawn and Computer-Generated Images
Found in: IEEE Computer Graphics and Applications
By Ross Maciejewski, Tobias Isenberg, William M. Andrews, David S. Ebert, Mario Costa Sousa, Wei Chen
Issue Date:March 2008
pp. 62-74
When people compare a computer-generated illustration to a hand-drawn illustration of the same object, they usually perceive differences. This seems to indicate that the two kinds of images follow different aesthetic principles. To explore and explain thes...
 
A Buffer Framework for Supporting Responsive Interaction in Information Visualization Interfaces
Found in: Creating, Connecting and Collaborating through Computing, International Conference on
By Tobias Isenberg, Andre Miede, Sheelagh Carpendale
Issue Date:January 2006
pp. 262-269
We present a framework that we are developing to better solve several critical issues that arise when interactive systems are extended to large displays. These issues include slow reaction times, difficulties with high numbers of concurrent interactions or...
 
An Interactive 3D Integration of Parallel Coordinates and Star Glyphs
Found in: Information Visualization, IEEE Symposium on
By Elena Fanea, Sheelagh Carpendale, Tobias Isenberg
Issue Date:October 2005
pp. 20
Parallel Coordinates are a powerful method for visualizing multidimensional data but, when applied to large data sets, they become cluttered and difficult to read. Star Glyphs, on the other hand, can be used to display either the attributes of a data item ...
 
Illustration Watermarks for Vector Graphics
Found in: Computer Graphics and Applications, Pacific Conference on
By Henry Sonnet, Tobias Isenberg, Jana Dittmann, Thomas Strothotte
Issue Date:October 2003
pp. 73
Digital watermarking is a technique for embedding information into data, such as images, 3D models, or audio files, such that some properties (i. e., security, imperceptibility, robustness) are maintained. While most of the existing watermarking techniques...
 
OPENNPAR: A System for Developing, Programming, and Designing Non-Photorealistic Animation and Rendering
Found in: Computer Graphics and Applications, Pacific Conference on
By Nick Halper, Tobias Isenberg, Felix Ritter, Bert Freudenberg, Oscar Meruvia, Stefan Schlechtweg, Thomas Strothotte
Issue Date:October 2003
pp. 424
The notable amount and variation of current techniques in non-photorealistic rendering (NPR) indicates a level of maturity whereby the categorization of algorithms has become possible. We present a conceptual model for NPR, on which we base a modular syste...
 
3D Illustrative Effects for Animating Line Drawings
Found in: Information Visualisation, International Conference on
By Tobias Isenberg, Maic Masuch, Thomas Strothotte
Issue Date:July 2000
pp. 413
Most illustrative techniques used in non-photorealistic rendering to date apply a rendering style to objects or a scene and alter the appearance of this style by employing illumination or depth cueing. However, for generating high quality illustrations thi...
 
Visualizing Knowledge about Virtual Reconstructions of Ancient Architecture
Found in: Computer Graphics International Conference
By Thomas Strothotte, Maic Masuch, Tobias Isenberg
Issue Date:June 1999
pp. 36
One of the assumptions of current software for visualizing architecture is that the underlying geometry is a correct, objective, and complete representation of the objects in question. However, we argue that such an ideal situation can hardly be met. Inste...
 
Weighted graph comparison techniques for brain connectivity analysis
Found in: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (CHI '13)
By Basak Alper, Benjamin Bach, Jean-Daniel Fekete, Nathalie Henry Riche, Tobias Isenberg
Issue Date:April 2013
pp. 483-492
The analysis of brain connectivity is a vast field in neuroscience with a frequent use of visual representations and an increasing need for visual analysis tools. Based on an in-depth literature review and interviews with neuroscientists, we explore high-l...
     
RealTimeChess: lessons from a participatory design process for a collaborative multi-touch, multi-user game
Found in: Proceedings of the ACM International Conference on Interactive Tabletops and Surfaces (ITS '11)
By Frederic Vernier, Jonathan Chaboissier, Tobias Isenberg
Issue Date:November 2011
pp. 97-106
We report on a long-term participatory design process during which we designed and improved RealTimeChess, a collaborative but competitive game that is played using touch input by multiple people on a tabletop display. During the design process we integrat...
     
Supporting sandtray therapy on an interactive tabletop
Found in: Proceedings of the 28th international conference on Human factors in computing systems (CHI '10)
By Mark Hancock, Sheelagh Carpendale, Thomas ten Cate, Tobias Isenberg
Issue Date:April 2010
pp. 2133-2142
We present the iterative design of a virtual sandtray application for a tabletop display. The purpose of our prototype is to support sandtray therapy, a form of art therapy typically used for younger clients. A significant aspect of this therapy is the ins...
     
Stippling by example
Found in: Proceedings of the 7th International Symposium on Non-Photorealistic Animation and Rendering (NPAR '09)
By David S. Ebert, Mario Costa Sousa, Ross Maciejewski, Sung Ye Kim, Tobias Isenberg, Wei Chen, William M. Andrews
Issue Date:August 2009
pp. 85-91
In this work, we focus on stippling as an artistic style and discuss our technique for capturing and reproducing stipple features unique to an individual artist. We employ a texture synthesis algorithm based on the gray-level co-occurrence matrix (GLCM) of...
     
Sketching, scaffolding, and inking: a visual history for interactive 3D modeling
Found in: Proceedings of the 5th international symposium on Non-photorealistic animation and rendering (NPAR '07)
By Brian Wyvill, Karan Singh, Pauline Jepp, Ryan Schmidt, Tobias Isenberg
Issue Date:August 2007
pp. 23-32
Inspired by the comic-book production pipeline, a method is proposed for integrating visual aspects of the sketching process into 3D sketch-based modeling systems. In particular, artist-drawn construction aids called visual scaffolding are explored. Two sc...
     
Modeling with rendering primitives: an interactive non-photorealistic canvas
Found in: Proceedings of the 5th international symposium on Non-photorealistic animation and rendering (NPAR '07)
By Katherine Mason, Martin Schwar, Sheelagh Carpendale, Tobias Isenberg
Issue Date:August 2007
pp. 15-22
Non-photorealistic rendering has placed much emphasis on developing algorithms that determine the appearance of renditions. To successfully deploy NPR rendering systems using these algorithms, however, one has to consider how artists, illustrators, or lay ...
     
Interactive pen-and-ink rendering for implicit surfaces
Found in: ACM SIGGRAPH 2006 Sketches (SIGGRAPH '06)
By Brian Wyvill, Ryan Schmidt, Tobias Isenberg
Issue Date:July 2006
pp. 98-es
Extracting depth information from pairs of stereo images in real-time allows interactive 3d operations on live video streams. We present a novel adaptation of the Semi-Global Matching (SGM) Algorithm [Hirschmüller 2005] to graphics processing (GPU) ha...
     
Interactive pen-and-ink rendering for implicit surfaces
Found in: Material presented at the ACM SIGGRAPH 2006 conference (SIGGRAPH '06)
By Brian Wyvill, Ryan Schmidt, Tobias Isenberg
Issue Date:July 2006
pp. 98-es
Extracting depth information from pairs of stereo images in real-time allows interactive 3d operations on live video streams. We present a novel adaptation of the Semi-Global Matching (SGM) Algorithm [Hirschmüller 2005] to graphics processing (GPU) ha...
     
Non-photorealistic rendering in context: an observational study
Found in: Proceedings of the 3rd international symposium on Non-photorealistic animation and rendering (NPAR '06)
By Joaquim A. Jorge, Mario Costa Sousa, Petra Neumann, Sheelagh Carpendale, Tobias Isenberg
Issue Date:June 2006
pp. 115-126
Pen-and-ink line drawing techniques are frequently used to depict form, tone, and texture in artistic, technical, and scientific illustration. In non-photorealistic rendering (NPR), considerable progress has been made towards reproducing traditional pen-an...
     
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