This paper describes the mission, objectives and research directionsof the Department of Computer Graphics and Interaction of the CzechTechnical University in Prague. It also gives a brief overview of therunning research projects and collaborations

Berka, Roman

Bittner, Jiri

Slavik, Pavel

This paper describes the mission, objectives, and research directions of the Department of Computer Graphics and Interaction of the Czech Technical University in Prague. It also gives a brief overview of the running research projects and collaborations

Bittner, Jiří

Slavík, Pavel

Digital Library of the Czech Technical University in Prague

VR and HCI Labs at the Czech TechnicalUniversity in PragueRoman Berka, Jirˇı´ Bittner, Pavel Slavı´kDepartment of Computer Graphics and InteractionFaculty of Electrical EngineeringCzech Technical University in PragueKarlovo namesti 13, 12135 Praha 2Czech RepublicWWW: http://dcgi.fel.cvut.czAbstract—This paper describes the mission, objectives, andresearch directions of the Department of Computer Graphicsand Interaction of the Czech Technical University in Prague. Italso gives a brief overview of the running research projects andcollaborations.Index Terms—virtual reality; human computer interaction;computer graphics.I. HISTORY AND MISSIONThe Department of Computer Graphics and Interaction(DCGI) is a part of the Faculty of Electrical Engineeringof the Czech Technical University in Prague (CTU). DCGIwas founded in 2008 by members of Computer GraphicsGroup which was formed in 1992 at the Department ofComputer Science and Engineering. The research activities ofDCGI focus on two main directions - Computer Graphics andHuman-Computer Interaction. These two research directionsare developed within two special laboratories: Virtual RealityLaboratory (VRLab) and Usability Laboratory (ULab). Inaddition a special institute – Institute for Intermedia (IIM) – isalso run by the department. All these facilities serve both forresearch and education at the CTU. The education part coversBSc, MSc, and PhD study programmes. In the BSc study trackDCGI offers 10 courses in the both fields (Computer Graphicsand HCI), in the MSc study track it offers 12 courses. DCGIcurrently employs 14 academic staff members and 13 PhDstudents.The long term objective of our department is to reach andmaintain the level of leading European universities in bothresearch and education activities. In particular we aim:• to educate bachelor, master, and doctoral students tobecome graduates with a high competence and greatpotential for their future careers.• to actively participate in the current research in the fieldsof Computer Graphics and Human-Computer Interaction.• to publish at reputable international conferences andprestigious journals.• to support teaching and research by carrying out projectsfunded by grant agencies and important commercial or-ganizations.• to collaborate with Czech and foreign partners in researchand teaching.II. OBJECTIVES AND RESEARCH LINESIn this section we describe the activities of the three mainlabs of DCGI: Virtual Reality Lab, Usability Lab and theInstitute of Intermedia (see Figure 1).A. Virtual Reality LabThe virtual reality laboratory (VRLab) is the main lab of thecomputer graphics group at DCGI. VRLab contains equipmentfor experiments in virtual and augmented reality as well astests of advanced rendering and interaction techniques. Inparticular it has at disposal a stereoscopic projection wall, atracking system, and two types of augmented reality setups.The members of computer graphics group conduct activeresearch in the field of real-time and realistic rendering (globalillumination, visibility computations) [1], [2], [3], [4], [5], [6],[7], [8], advanced data structures for computer graphics [9],[10], computer games [11], and also in the field of contentcreation and 3D reconstruction for images and video [12], [13],[14], [15]. The computer graphics group has intensive linksto several research groups in Europe (Vienna University ofTechnology, Max Planck Institute for Informatics, Universityof Girona) as well as overseas (Purdue University, ArizonaState University). More information about VRLab can befound at http://dcgi.felk.cvut.cz/en/research.B. Usability LabThe Usability Lab (ULab) of DCGI has been established in2004 in cooperation with Sun Microsystems. At that time itwas the very first professionally equipped usability lab in thecountry. The main objective of the laboratory is to performusability research in the framework of projects performed atCTU (in the past mainly in cooperation with Sun Microsys-tems). As the CTU students traditionally participate duringtheir study in research projects of various type, the lab is thusused also in education and students get the opportunity ofacquaintance with usability lab and with methodology used inusability testing. As a result the graduates from CTU have thebasic knowledge in usability testing plus the knowledge aboutthe methodology of user interface (UI) design. More detailscan be found in [16].6 SBC Journal on 3D Interactive Systems, volume 2, number 2, 2011ISSN: 2236-3297Fig. 1. Overview of the DCGI labs: (left) Augmented reality setup at the Virtual Reality Lab, (center) the Usability Lab, (right) CAVE at the Institute ofIntermedia.We focus on two main research lines: UI for mobile comput-ing and UI for handicapped users (accessibility issues). In thefield of mobile computing we pay a special attention to issuesin graphical interaction in mobile environment (small screen,multimodal interaction, role of context etc.). In the second fieldwe investigate namely the needs of blind and visually impairedusers. Technically speaking our HCI research has two foci: thedesign and the consequent testing of the UI developed [17],[18], [19], [20]. More information about ULab can be foundat http://www.ulab.cz.C. Institute of IntermediaThe Institute of Intermedia (IIM) has been established in2007 as a cooperative platform by three universities: CzechTechnical University in Prague (CTU), Academy of Perform-ing Arts in Prague (APA) and Academy of Arts, Architectureand Design in Prague.The goal of the IIM is to create a common platform for stu-dents of art and technical disciplines, scientists and freelanceartists to cooperate on common projects and experiments. Theactivities of IIM cover the fields of virtual reality, multimedia,stereoscopy, light design, and audio-visual performances. Themain objective of IIM and its founders is to support thesymbiosis of humanistic oriented disciplines with the technicalsciences. We expect that this interdisciplinary relation boostsa creative potential of all participating students, researchers,and artists. The main three tracks of IIM activities are thusformed by education, research and public performances withexhibitions. The performances are typically realized by ourstudents supported by freelance artists cooperating with IIM.The research activities of IIM are in its initial phase. Webuild on our experience from the area of virtual reality andstereoscopy and on the availability of advanced hardwaresetups such as CAVE system and optical motion tracking. Ourfirst attempts lie in explorations of collaborative interactionin distributed virtual environments. Our goals are directed tointelligent multimedia communication methods allowing adap-tation of data transmitted among VR devices with differentlevel of immersion. This technology should make possible toexchange multimedia and 3D content together with meta dataindependently of the abilities of the particular devices. Forexample we develop a methodology to observe a session oftwo CAVE-like devices by a user with a notebook, while max-imizing the throughput of the available information transfer tothe user [21]. More information about IIM can be found athttp://www.iim.cz.D. Research projectsDCGI participates in both national and international re-search projects dealing with computer graphics and humancomputer interaction. In this section we list the currentlyrunning projects. Some of our recent research results aredepicted in Figure 2.a) VERITAS: The VERITAS project aims to develop,validate and assess tools for built-in accessibility support at allstages of product development, including specification, design,development and testing. The goal is to introduce simulationbased and virtual reality testing at all stages of assistivetechnologies product design and development into variousapplications that handicapped users can use. The VERITASproject is funded from the 7th Framework Programme of theEuropean Commission. More information about the projectcan be found at http://veritas-project.eu.b) AEGIS: The AEGIS project seeks to determinewhether 3rd generation access techniques will provide a moreaccessible, more exploitable and deeply embeddable approachin the mainstream desktop, rich internet and mobile applica-tions. The AEGIS project is funded from the 7th FrameworkProgramme of the European Commission. More informationabout the project can be found at http://www.aegis-project.eu.c) ACCESSIBLE: The ACCESSIBLE project will exploitthe technologies behind the recent expansion of accessibilitytools and standardization methodologies, in order to providean integrated simulation assessment environment for support-ing the production of accessible software applications. TheACCESSIBLE project is funded from the 7th FrameworkProgramme of the European Commission. More informationabout the project can be found at http://www.accessible-eu.org.d) Center for Computer Graphics (CPG): CPG is scommon research project of four universities from the CzechRepublic. The aim of the project is to strengthen the researchpotential of the partner institutions by bringing their expertstogether and providing a platform for financing their researchprojects in the field of advanced computer graphics techniques.SBC Journal on 3D Interactive Systems, volume 2, number 2, 2011 7ISSN: 2236-3297Fig. 2. Images illustrating some of the results of our recent research projects (all images are a courtesy of the authors of the corresponding papers).(top) Ray Tracing with Sparse Boxes [8], Perceptual Evaluation of Color-to-Grayscale Image Conversions [4], Real-time Color Ball Tracking for AugmentedReality [22]. (middle) Adaptive Global Visibility Sampling [2], LazyBrush: Flexible Painting Tool for Hand-drawn Cartoons [23], Layout-aware optimizationfor interactive labeling of 3D models, (bottom) Adding Depth to Cartoons Using Sparse Depth (In)equalities [13], Efficient Stack-less Traversal Algorithmfor Ray Tracing with BVH [9] (the depicted model is a courtesy of Anat Grynberg and Greg Ward), TexToons: Practical Texture Mapping for Hand-drawnCartoon Animations [12].e) ARGIE: Global Illumination for Augmented Realityin General Environments (ARGIE) is a research project ofthe computer graphics group. The project aims at computingrealistic images mixing a real scene with virtual objects whileusing only a very limited amount of a priori information aboutthe real scene. Our project aims at designing methods andalgorithms for computing different global illumination compo-nents in augmented reality including illumination effects likeshadows, diffuse, glossy and specular reflections and caustics.f) CAVE to CAVE: CAVE to CAVE (C2C) is a projectrealized in cooperation with the Czech Internet provider CES-NET where the main goal is the development of alternativeways to transmit content presented in one CAVE device toanother distant visual device using broad-band networks.g) Stereo: Stereo is a project supported by Czech Min-istry of Education oriented to development of stereoscopyproduction chain usable in education process and later alsoin research. The project is realized in cooperation with Filmand TV Faculty of Academy of Performing Arts in Prague.h) Digitization of the Langweil Model: The Langweilmodel of Prague is a historical coloured paper model of thePrague city center from the first half of the 19th century. Ourgroup participated in the project of digitizing the model, whichwas financed by the Prague City Museum. One of the researchoriented outcomes of the project is a challenging data set forvarious computer vision algorithms available for downloadafter registration at http://dcgi.felk.cvut.cz/langweil3d. Moredetails about the project can be found at [24].i) VRUT: The VRUT (Virtual Reality Universal Toolkit)project is developed in cooperation with the Skoda-Autocompany. It aims at the development of various tools forhigh quality stereoscopic presentations and evaluations of thevirtual car prototypes. In the project we also develop a drivingsimulation software designed primarily for human-machineinterface evaluation.III. CONCLUSIONThe above described labs were established with the aimto support both the research and educational activities of our8 SBC Journal on 3D Interactive Systems, volume 2, number 2, 2011ISSN: 2236-3297department. Our experience gained in last few years has shownthat these labs opened up new prospects in two main areas: (1)Students got access to sophisticated technologies and learnedhow to operate them. This fact will improve their position onlabor market after their graduation from CTU. (2) It has beenpossible to get involved in international research projects andnational industrial projects where the equipment of these labsis used.The labs created a synergy where mutual crossfertilizationbetween Computer Graphics, HCI, and art is taking place.Many new interesting ideas have appeared and they werebrought to life in the projects performed in these labs. Wehope that the activities of our labs will successfully continuein the future and one of our aims is to extend our activitiesby involving new people and new collaborating institutions.ACKNOWLEDGMENTSOur research activities are partially supported by theMSMT under the research programs LC-06008 (Centerfor Computer Graphics) and MSM 6840770014, by theGrant Agency of the Czech Republic under projects numberP202/11/1883 (ARGIE) and by the European Commissionunder project number FP7-ICT-247765 (VERITAS), FP7-ICT-224348 (AEGIS), FP7-ICT-224145 (ACCESSIBLE).REFERENCES[1] V. Havran, J. Filip, and K. Myszkowski, “Bidirectional texture func-tion compression based on multi-level vector quantization,” ComputerGraphics Forum, vol. 29, no. 1, pp. 175–190, 2010.[2] J. Bittner, O. Mattausch, P. Wonka, V. Havran, and M. Wimmer,“Adaptive global visibility sampling,” ACM Trans. Graph., vol. 28, pp.94:1–94:10, July 2009.[3] V. Gassenbauer, J. Krivanek, and K. Bouatouch, “Spatial directionalradiance caching,” Computer Graphics Forum, vol. 28, no. 4, pp. 1189–1198, 2009.[4] M. Cadik, “Perceptual evaluation of color-to-grayscale image conver-sions,” Computer Graphics Forum, vol. 27, no. 7, pp. 1745–1754, 2008.[5] J. Obert, J. Krivanek, F. Pellacini, D. Sykora, and S. Pattanaik, “icheat:A representation for artistic control of indirect cinematic lighting,”Computer Graphics Forum, vol. 27, no. 4, pp. 1217–1223, 2008.[6] O. Mattausch, J. Bittner, and M. Wimmer, “Chc++: Coherent hierar-chical culling revisited,” Computer Graphics Forum, vol. 27, no. 2, pp.221–230, 2008.[7] R. Herzog, V. Havran, S. Kinuwaki, K. Myszkowski, and H.-P. Seidel,“Global illumination using photon ray splatting,” in Computer GraphicsForum, vol. 26(3), no. 3, Prague, Czech Republic, 2007, pp. 503–513.[8] V. Havran and J. Bittner, “Ray tracing with sparse boxes,” in Proceedg-ings of Spring Conference on Computer Graphics, 2007, pp. 49–54.[9] M. Hapala and V. Havran, “Review: Kd-tree Traversal Algorithms forRay Tracing,” Computer Graphics Forum, vol. 30, no. 1, pp. 199–213,march 2011.[10] M. Hapala, T. Davidovicˇ, I. Wald, V. Havran, and P. Slusallek, “Efficientstack-less traversal algorithm for ray tracing with bvh,” in Proceedgingsof Spring Conference on Computer Graphics, 2011, pp. 29–34.[11] L. Kavan, S. Collins, J. Zˇa´ra, and C. O’Sullivan, “Geometric skin-ning with approximate dual quaternion blending,” ACM Trans. Graph.,vol. 27, pp. 105:1–105:23, November 2008.[12] D. Sy´kora, M. Ben-Chen, M. Cˇadı´k, B. Whited, and M. Simmons,“Textoons: Practical texture mapping for hand-drawn cartoon anima-tions,” in Proceedings of International Symposium on Non-photorealisticAnimation and Rendering, 2011, pp. 75–83.[13] D. Sy´kora, D. Sedlacek, S. Jinchao, J. Dingliana, and S. Collins, “Addingdepth to cartoons using sparse depth (in)equalities,” Computer GraphicsForum, vol. 29, no. 2, pp. 615–623, 2010.[14] L. Cmolik and J. Bittner, “Layout-aware optimization for interactivelabeling of 3d models,” Computers & Graphics, vol. 34, no. 4, pp. 378– 387, 2010, procedural Methods in Computer Graphics; IllustrativeVisualization.[15] Z. Mikovec, P. Slavik, and J. Zara, “Cultural heritage, user interfacesand serious games at CTU prague,” in Virtual Systems and Multimedia,2009. VSMM ’09. 15th International Conference on, sept. 2009, pp. 211–216.[16] P. Slavı´k and Z. Mı´kovec, “Usability in the Czech Republic,” in GlobalUsability, ser. Human-Computer Interaction Series. Springer London,2011, pp. 137–152.[17] L. Kunc, J. Kleindienst, and P. Slavı´k, “Talking head as life blog,” inProceedings of the 11th international conference on Text, Speech andDialogue, ser. TSD ’08. Berlin, Heidelberg: Springer-Verlag, 2008, pp.365–372.[18] I. Maly, J. Curin, J. Kleindienst, and P. Slavik, “Creation and visualiza-tion of user behavior in ambient intelligent environment,” in InformationVisualisation, 2008. IV ’08. 12th International Conference, 2008, pp. 497–502.[19] O. Pola´cˇek, A. J. Sporka, and P. Slavı´k, “Music alphabet for low-resolution touch displays,” in Proceedings of the International Confer-ence on Advances in Computer Enterntainment Technology, ser. ACE’09. New York, NY, USA: ACM, 2009, pp. 298–301.[20] O. Pola´cˇek and Z. Mı´kovec, “Hands free mouse: comparative study onmouse clicks controlled by humming,” in Proceedings of the 28th ofthe international conference extended abstracts on Human factors incomputing systems, ser. CHI EA ’10. New York, NY, USA: ACM,2010, pp. 3769–3774.[21] Z. Tra´vnı´cˇek and R. Berka, “Multi-threaded real-time video grabber,” inWSCG’10 Communication Papers Proceedings, 2010.[22] D. Sy´kora, D. Sedla´cˇek, and K. Riege, “Real-time color ball trackingfor augmented reality,” in Proceedgings of Eurographics Symposium onVirtual Environments, 2008, pp. 9–16.[23] D. Sy´kora, J. Dingliana, and S. Collins, “Lazybrush: Flexible paintingtool for hand-drawn cartoons,” Computer Graphics Forum (Proceedingsof Eurographics 2009), vol. 28, no. 2, pp. 599–608, 2009.[24] D. Sedlacek and J. Zara, “Graph cut based point-cloud segmentationfor polygonal reconstruction,” in Proceedings of the 5th InternationalSymposium on Advances in Visual Computing: Part II, ser. ISVC ’09.Berlin, Heidelberg: Springer-Verlag, 2009, pp. 218–227.SBC Journal on 3D Interactive Systems, volume 2, number 2, 2011 9ISSN: 2236-3297

VR and HCI Labs at the Czech Technical University in Prague

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VR and HCI Labs at the Czech Technical University in Prague

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