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Research Groups | Computer Graphics, Image Processing, and Interaction

The research group in Computer Graphics, Image Processing and Interaction covers various research topics related to these three areas.

The issues associated with computer graphics include modeling and rendering of complex objects and natural physics-based simulation (especially human-body organs and modeling tools for virtual surgery), animation (involving deformation and motion and path planning), techniques and algorithms for computer games, spatial data structures, geometric algorithms and use of graphics hardware for solving computationally expensive problems.

Research in Image Processing, Computer Vision and Pattern Recognition is focused on the processing of visual information, techniques and applications of filtering, enhancement, segmentation and images analysis and videos from various sources. Research topics are also modeling and recognition of objects in scenes, finding a wide range of applications in real problems such as medical imaging, tracking and face recognition or people’s behavior, content image retrieval, 3D photography, metrology for images, intelligent vehicles, augmented reality, among others.

Research in Human-Computer Interaction (HCI) includes technological, methodological and conceptual interaction aspects. From the technological point of view, new techniques and interactive devices are being explored, such as: development of 3D interfaces, non-conventional interaction, natural interaction techniques, accessibility, and adaptive multimodal interaction. This work has applications in mobile devices, immersive virtual reality environments, games, and medical applications. We also investigate the integration of these interfaces with other areas of computing, such as Visualization, Software Engineering and Computer Music. Also studied are the fundamental issues of HCI, such as modeling interaction and usability evaluation.

Research in Visualization covers research techniques of information visualization and scientific data, preferably focusing on problems involving large and/or complex data. Visualization of medical data, applications for the oil industry, biodiversity information, display applications, visualization and analysis of social networks are some examples of recent work in this area of the group.

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Researchers

Collaborators

  • Daniela Trevisan
  • Edson Prestes
  • Horácio E. Fortunato
  • Marco Antonio Alba Winckler
  • Rui Manuel Ribeiro Bastos
  • Airton Leite Kronbauer
  • Marcelo Soares Pimenta
  • Claudio T. Silva

Research Themes

  • Animation in Virtual Environments: Simulation of behavior of characters in virtual environments, planning paths in complex and dynamic environments.
  • Interaction: Study and development of interaction techniques for scientific visualization applications and information, study and development of interaction techniques for games, 3D environments, and immersive virtual reality for use with mobile devices; proposal of new devices for non-conventional interaction; study of interaction techniques in tiled displays and public displays, development of multimodal interactive applications adaptable to the needs of the user or device available, evaluation of usability of interaction techniques.
  • Modeling and Rendering: Construction of digital geometric models: data obtained from laser scanners or by contact, change of poses, 3D photography, synthesis of photorealistic images in real time, modeling of natural visual patterns for animals and plants, applications in games and computer animation, programmable graphics hardware.
  • Image Processing: Processing and analysis of images and videos, extraction and summarization of images and videos to index and retrieve data / information for content (eg sport events), personalized access to content via automatic recognition of faces, encoding and storage of visual data. Techniques and applications of filtering, enhancement, segmentation and analysis of images and videos from various sources.
  • Video and Audio Processing: Video capture and processing of real-time video applications in surgery, synthesis of real-time audio applications for music using programmable graphics hardware.
  • Physics-based Simulation: Construction of graphical representations of the physical properties of rigid and deformable objects, including power distribution, power, voltage, pressure, heat, etc. Fluid simulation and animation. Efficient collision and contact detection between such objects. Interaction and visualization in real time with objects using these interfaces return force (haptic).
  • View Information: Study and development of information visualization techniques: hierarchical data, multidimensional data, social networks, scientific data and volumetric data, evaluation of usability of visualization techniques, modeling user tasks in information visualization applications, geometric algorithms, and programmable graphics hardware.


Recent Research Projects

  • AES Sul-UFRGS Agreement: Modeling and evaluation of risk behavior associated with the immersive VR environment in the area of electricity distribution (2011-2013). Participants: UFRGS, AES Sul, Art Nexus, Comportamento, Urizen.
  • HP UFRGS-Brazil Agreement: Development of multimodal analysis techniques for videoconferencing and obtaining 3D models from multiple cameras (2011). Participants: UFRGS, Brazil HP (collaboration with HP Labs Palo Alto).
  • International Cooperation Brazil-Germany (CAPES / PROBAL): Geometric Modeling: 3D Reconstruction from Images and Points; Deformation Data using Finite Element Methods; View from sample data (2007-2009). Participants: UFRGS, USP-São Carlos, University of Stuttgart.
  • International Cooperation Belgium-Brazil (CNPq / FNRS): IVisHDMed Interactive Visualization and manipulation of high resolution and large volumes of data for medical applications (2011-2013). Participants: UFRGS, FFU, UCL (Université catholique de Louvain), Louvain-la-Neuve. Design and development of multimodal interaction techniques for advanced systems (2007-2009). Participants: UFRGS, UCL Louvain-la-Neuve and provide Universitaires Notre-Dame de la Paix, Namur.
  • International Cooperation France-Brazil (CNPq / INRIA): Methods of evaluation, design guides and environments for virtual reality and visualization of information (2005-2008). Participants: UFRGS and INRIA (France).