Prof. Dr. Jürgen Döllner

Dr. Matthias Trapp

Matthias Trapp


Tel.: +49-(0)331 5509-3913
Fax: +49-(0)331 5509-172
Room: H-2.28
Email: matthias.trapp(at)hpi.de


Research Interests

Matthias Trapp currently works as a post-doctoral researcher, lecturer, and head of the research group '4DnD-Geovisualization' (InnoProfile Transfer Initiative) at HPI, Computergraphics Systems Chair. His research interests include the following topics:

  • GPU-based image and video processing techniques and frameworks 
  • Interactive GPU-based rendering techniques for massive spatio-temporal data
  • Focus+context visualization techniques for 3D virtual environments
  • Web-based visualization for mobility analytics
  • Interactive software maps

We also offer topics for master theses

Past Research Projects


Interactive GPU-based Image Deformation for Mobile Devices

Vollmer, Jan Ole; Trapp, Matthias; Döllner, Jürgen in Computer Graphics and Visual Computing (CGVC) The Eurographics Association , 2016 .

Interactive image deformation is an important feature of modern image processing pipelines. It is often used to create caricatures and animation for input images, especially photos. State-of-the-art image deformation techniques are based on transforming vertices of a mesh, which is textured by the input image, using affine transformations such as translation, and scaling. However, the resulting visual quality of the output image depends on the geometric resolution of the mesh. Performing these transformations on the CPU often further inhibits performance and quality. This is especially problematic on mobile devices where the limited computational power reduces the maximum achievable quality. To overcome these issue, we propose the concept of an intermediate deformation buffer that stores deformation information at a resolution independent of the mesh resolution. This allows the combination of a high-resolution buffer with a low-resolution mesh for interactive preview, as well as a high-resolution mesh to export the final image. Further, we present a fully GPU-based implementation of this concept, taking advantage of modern OpenGL ES features, such as compute shaders.
Weitere Informationen
Tags cgs image_deformation image_warping

Professional Activities

Peer-Reviewing Activities for Journals:

Peer-Reviewing Activities for Conferences:

  • Annual Conference of the European Association for Computer Graphics (EG): 2012, 2017
  • EG/VGTC Conference on Visualization (EuroVis): 2014
  • IEEE Information Visualization (Vis): 2009
  • Symposium on Service-Oriented Mapping (SOMAP): 2012
  • ACM International Conference on 3D Web Technology (Web3D): 2014
  • International Conference on Computer Graphics, Visualization and Computer Vision (WSCG): 2011, 2012, 2013, 2016, 


Other Activities:

  • Conference Session Chair (Rendering), GRAPP 2009/2015

Teaching Activities

Courses at HPI (Responsible for lecturing and grading) 

  • Summer 2017 (M): Image & Video Processing Techniques
  • Summer 2015 (M): Introduction to Visualization
  • Winter 2014/2015 (B): Computer Graphics II
  • Winter 2013/2014 (B): Computer Graphics II
  • Summer 2013 (M): Geovisualization

Courses at HPI (Responsible for lecturing and tutoring)  

  • Summer 2012 (B): Computer Graphics I
  • Winter 2011/2012 (B): Computer Graphics II
  • Summer 2010 (B): Programming of 3D Applications
  • Winter 2009/2010 (M): Geovisualization II
  • Summer 2009 (M): Geovisualization I 
  • Summer 2008 (M): Rendering Techniques

Courses at University of Potsdam (Responsible for lecturing and tutoring)  

  • Winter 2002/2003: Operating Systems II
  • Summer 2002: Operating Systems I

Seminars at HPI (Responsible for lecturing, tutoring, and grading)

  • Summer 2017 (M): Advanced Information Visualization
  • Winter 2016/2017 (M): Processing and Visualization of 3D Geodata
  • Winter 2016/2017 (B): Bildverarbeitungsalgorithmen
  • Summer 2016 (M): Image Processing - Concepts and Techniques
  • Summer 2016 (M): Methods and Techniques of Geospatial Visualization
  • Summer 2016 (B): Geoinformationstechnologien
  • Winter 2015/2016 (B): Image and Videoprocessing using OpenGL ES for Mobile Devices
  • Summer 2015 (M): Spatial Analytics
  • Winter 2014/2015 (M): Geoinformation Technologies
  • Summer 2014 (M): Information Visualization
  • Winter 2013/2014 (M): Information Visualization
  • Summer 2013 (M): Geovisualization
  • Winter 2012/2013 (M): Concepts and Techniques of 3D-Visualization
  • Summer 2011 (M): Multimedia/Graphics Libraries & Systems
  • Winter 2010/2011 (B): Game Programming
  • Summer 2010 (M): Information and Geovisualization
  • Winter 2009/2010 (B): Game Programming
  • Winter 2008/2009 (M): Focus+Context Visualization in 3D Geovirtual Environments
  • Winter 2007/2008 (B): Seminar & Lab Computer graphics Systems/VRS
  • Summer 2007 (B): Seminar & Lab Computer graphics Systems/VRS

Master Students (Co-)Supervision:

  • Focus+Context Visualization Techniques for Mobility Analytics
    Marc Listemann, Master Thesis, 2017
  • Network-based Reachability-Map Visualization for Web Applications and Mobile Devices
    Alexander Schoedon, Master Thesis, 2017
  • Design and Implementation of Level-of-Detail Representations for Georeferenced Thematic Data
    Jan Ole Vollmer, Master Thesis, 2016
  • Natural Phenomena as Metaphors for Visualization of Trend Data in Interactive Software Maps
    Hannes Würfel, Master Thesis, 2015
  • A GPU-based  rendering Technique for Interactive Video Deformation
    Benjamin-Heinz Meier, Master Thesis, 2015
  • Interactive Rendering Techniques for Focus+Context Visualization of virtual 3D Indoor Models, Alessandro Florio, Master Thesis, 2014
  • Concepts and Rendering Techniques for Level-of-Abstraction Transitions of 3D Geovirtual Environments, Amir Semmo, Master Thesis, 2011
  • Generalization of Street Networks as Strategy to Reduce Cognitive Efforts in Map Reading, Daryna Bronnykova, Master Thesis, 2011
  • View-dependent Global Deformations, for 3D Geovirtual Environments of Virtual 3D Landscape and City Models, Sebastian Pasewaldt, Master Thesis, 2010
  • Rendering von generalisierter Tiefenschärfe in interaktiven 3D virtuellen Umgebungen, Christian Beesk, Master Thesis, 2010
  • Generierung und Parametrisierung von 3D-Gebäudegeometrienin virtuellen 3D-Stadtmodellen, Mathias Pietsch, Diploma Thesis, 2007

PhD Students (Co-)Supervision:

  • Willy Scheibel, Understanding Evolution of Hierarchies using Space-restricted Visualizations
  • Vladeta Stojanovic, Interactive Visualization for Building Lifecycle Management using BIM
  • Jan Ole Vollmer, Tools and Techniuqes for Visualization of High-dimensional Data

Invited Talks

  • Programmable Rendering Pipelines and Interactive Visualization, Invited Talk at the Department of Computer Graphics, Institute for Computer Science, Rostock/Germany, 2014
  • Neighborhood Visualization – Challenges and Approaches from a Geovisualization Perspective, Blankensee Colloquium 2012: Neighborhood Technologies Media and Mathematics of Dynamic Networks, Berlin/Germany
  • Colonia3D – Potenziale interaktiver Kommunikation von digitaler Denkmalpflege in öffentlichen Räumen, Prometheus Conference 2011, University of Cologne, Cologne/Germany
  • Kommunikation von digitaler Denkmalpflege in öffentlichen Räumen am Beispiel des Projektes Colonia3D, Invited Talk at the Department of Photogrammetry & Laserscanning at the HCU (HafenCity University), Hamburg/ Germany
  • High-Level Vector Editing, Invited Talk at the Computer Science Department of the Courant Institute of Mathematical Sciences at New York University, New York/USA, 2010

Conference Talks




  • Integration von Fachinformationen in 3D-Darstellungen, Xinnovations 2011, E-City Forum, September, Berlin/Germany
  • Colonia3D, Kultur und Informatik - Multimediale Systeme, May 2011, Berlin/Germany





  • A Concept of Effective Landmark Depiction in Geovirtual 3D Environments by View-Dependent Deformation, 4th International Symposium on LBS and Telecartography, October, Hong Kong
  • Automated Combination of Real-Time Shader Programs, Eurographics conference, September, Prague, Czech Republic


  • Evolutionary Algorithms, Stanislaw Lem Workshop on Evolution, October, Lviv (Lemberg), Ukraine

Awards & Honors & Miscellaneous

  • Cover Image Selection, Proceedings of TPCG 2013, 2013
  • Cover Image Selection, International Journal of Heritage in the Digital Era, vol. 1, no. 1, 2012.
  • Cover Image Selection, gis.SCIENCE Journal, vol. 25, no. 1, 2012
  • Best Paper Award, EuroMed 2010 Conference, Communication of Digital Cultural Heritage in Public Spaces by the Example of Roman Cologne
  • 2009 Best Paper Selection, LBS & Telecartography Conference, Strategies for Visualizing Points-of-Interest of 3D Virtual Environments on Mobile Devices
  • 2008 Best Paper Award, AGILE 2008 Conference, Interactive Multi-Perspective Views of Virtual 3D Landscape and City Models
  • Best Paper Selection, GRAPP 2008 Conference, Generalization Approach for 3D Viewing Deformations of Single-Center Projections