Completion of the VICCI project – Part 1

The ESF-funded junior research group VICCI dealt from 2012 until the end of 2014 with the development, control and integration of cyber physical systems (CPS) at the Faculty of Computer Science of the Dresden University of Technology. The scope includes smart home environments and supporting people in the ambient assisted living.

My work package for visualization and visual analysis has within the project investigated three essential aspects and corresponding solutions:

• visual analysis of complex, multi-dimensional, multimodal, dynamic space-time data,
• visualization in heterogeneous, mobile and distributed IT infrastructure, and
• implementation of visualization systems and components.

Today I am writing about the visual analysis of complex space-time data.

Visual analysis serves as administrative overview of a current CPS, mainly for security reasons, as assistance during development, and the operation of the system. Particularly interesting are out-of-the-ordinary (erroneous) behavior and the formation of emergent system properties. For this a visual exploration with minimal previous assumptions is necessary. For example, certain data, like forces acting upon joints of a robot arm, be visualized more effectively by representations in geometrical context. This assumption however reduced the generality of visualization.

I thus developed a corresponding visualization of data collected by the CPS using coordinated views of continuous-time scatter plots, continuous-time parallel coordinate plots and temporal heatmaps. This application is capable of interactive real-time representation of generic multi-dimensional data and offers the means for a visual analysis. The developed system was published in the journal Computer Graphics Forum, the leading European Journal on Visualization. In the context of the evaluation, live data from our laboratory CPS war visualized, presented and discussed with a broad audience.

• S. Grottel, J. Heinrich, D. Weiskopf, and S. Gumhold, “Visual Analysis of Trajectories in Multi-Dimensional State Spaces,” Computer Graphics Forum, vol. 33, iss. 6, pp. 310-321, 2014.
  [Bibtex]

  @article {Grottel2014HDTraj,
    author = {Grottel, Sebastian and Heinrich, Julian and Weiskopf, Daniel and Gumhold, Stefan},
    title = {{Visual Analysis of Trajectories in Multi-Dimensional State Spaces}},
    year = {2014},
    journal = {Computer Graphics Forum},
  volume = {33},
  number = {6},
  pages = {310--321},
    doi = {10.1111/cgf.12352}
  }

DOI: 10.1111/cgf.12352

This visualization was implemented as a plugin for the MegaMol visualization system. The source code can be downloaded freely and can be used according to the enclosed License:

hdtraj.mmplugin.zip Multi-Dimensional Trajectory Visualization MegaMol Plugin
[99.7 KB; MD5: 0a6eaf465318b0f256ecfdf8a8b4ad50; More Info]

To compile the MegaMol system and the plugin, use the appropriate Instructions on the MegaMol website.