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Cooperative object manipulation in immersive virtual environments: framework and techniques
A framework supporting the development of collaborative manipulation techniques, methods of combining simultaneous user actions, and the awareness tools used to provide the necessary knowledge of partner activities during the cooperative interaction process are described.
A taxonomy of tasks for guiding the evaluation of multidimensional visualizations
A taxonomy of visualization tasks is proposed, based on existing taxonomies as well as on the observation of users performing exploratory tasks in a multidimensional data set using two different visualization techniques, Parallel Coordinates and RadViz.
Evaluating Usability of Information Visualization Techniques
The results towards the definition of criteria for evaluating information visualization techniques are reported, addressing evaluation of visual representations and interaction mechanisms.
A Formal Description of Multimodal Interaction Techniques for Immersive Virtual Reality Applications
This paper discusses the advantages of using a formal description technique (called ICO) to model interaction techniques and dialogues for VR applications and shows, through analysis of models, how the formal notation can help to ensure the usability, reliability and efficiency of virtual reality systems.
Real-time volume rendering of time-varying data using a fragment-shader compression approach
- A. Binotto, J. Comba, C. Freitas
- Computer ScienceIEEE Symposium on Parallel and Large-Data…
- 20 October 2003
A new visualization technique is presented that includes a compression scheme of sparse 4D functions into 3D textures, and a visualization algorithm that decompress the stored data from the3D textures using the programmability of fragment shaders, allowing real-time visualization of such data.
Design of Multi-dimensional Transfer Functions Using Dimensional Reduction
This paper proposes a multi-dimensional transfer function design technique that uses self-organizing maps to perform dimensional reduction, and gives uniform treatment to volume data containing voxel signatures of arbitrary dimension.
Anatomy-based joint models for virtual human skeletons
- Anderson Maciel, L. Nedel, C. Freitas
- Computer Science, EngineeringProceedings of Computer Animation (CA )
- 19 June 2002
A new joint model for articulated human skeletons based in human anatomy and conceived for use in medical applications is described, which tries to overcome some limitations of other models used in computer graphics.
A Survey on Information Visualization for Network and Service Management
- Vinicius Tavares Guimaraes, C. Freitas, R. Sadre, L. Tarouco, L. Granville
- Computer ScienceIEEE Communications Surveys & Tutorials
- 21 January 2016
This paper surveys the use of information visualization techniques as a tool to support the network and service management process through a systematic literature review (SLR), and presents a classification of 285 articles and papers from 1985 to 2013 according to an information visualization taxonomy.
Experimental study on evaluation of multidimensional information visualization techniques
- Raquel M. Pillat, Eliane Regina de Almeida Valiati, C. Freitas
- Computer ScienceCLIHC '05
- 23 October 2005
An experimental study based on tests with users to evaluate two multidimensional information visualization techniques, Parallel Coordinates and Radviz to identify usability problems following the ergonomic criteria from Bastien and Scapin on implementations of both techniques.
VirtualDesk: A Comfortable and Efficient Immersive Information Visualization Approach
This work implements and evaluates an alternative data exploration metaphor where the user remains seated and viewpoint change is only realisable through physical movements, and demonstrates that the prototype setup, named VirtualDesk, presents excellent results regarding user comfort and immersion, and performs equally or better in all analytical tasks.