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Rudolf Netzel

Dr.

Visualization Research Center (VISUS)

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Publications

Publications:

2019
1. Zhou, Liang ; Netzel, Rudolf ; Weiskopf, Daniel ; Johnson, Chris R.: Spectral Visualization Sharpening. In: Neyret, S. ; Kokkinara, E. ; González-Franco, M. ; Hoyet, L. ; Cunningham, D. W. ; Swidrak, J. (Hrsg.) ; Neyret, S. ; Kokkinara, E. ; González-Franco, M. ; Hoyet, L. ; Cunningham, D. W. ; Swidrak, J. (Hrsg.): Proceedings of the ACM Symposium on Applied Perception (SAP), Proceedings of the ACM Symposium on Applied Perception (SAP) : ACM, 2019 — ISBN 978-1-4503-6890-2, S. 18:1-18:9
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  BibTeX
  @inproceedings{conf/apgv/0001NWJ19, abstract = {In this paper, we propose a perceptually-guided visualization sharpening technique. We analyze the spectral behavior of an established comprehensive perceptual model to arrive at our approximated model based on an adapted weighting of the bandpass images from a Gaussian pyramid. The main benefit of this approximated model is its controllability and predictability for sharpening color-mapped visualizations. Our method can be integrated into any visualization tool as it adopts generic image-based post-processing, and it is intuitive and easy to use as viewing distance is the only parameter. Using highly diverse datasets, we show the usefulness of our method across a wide range of typical visualizations.}, author = {Zhou, Liang and Netzel, Rudolf and Weiskopf, Daniel and Johnson, Chris R.}, booktitle = {Proceedings of the ACM Symposium on Applied Perception (SAP)}, crossref = {conf/apgv/2019}, doi = {10.1145/3343036.3343133}, editor = {Neyret, Solène and Kokkinara, Elena and González-Franco, Mar and Hoyet, Ludovic and Cunningham, Douglas W. and Swidrak, Justyna}, ee = {https://doi.org/10.1145/3343036.3343133}, isbn = {978-1-4503-6890-2}, pages = {18:1-18:9}, publisher = {ACM}, title = {Spectral Visualization Sharpening.}, url = {https://doi.org/10.1145/3343036.3343133}, year = 2019 }
  Link
  https://doi.org/10.1145/3343036.3343133
2017
1. Netzel, Rudolf ; Vuong, Jenny ; Engelke, Ulrich ; O’Donoghue, Seán I. ; Weiskopf, Daniel ; Heinrich, Julian: Comparative Eye-tracking Evaluation of Scatterplots and Parallel Coordinates. In: Visual Informatics, Visual Informatics. Bd. 1 (2017), Nr. 2, S. 118–131
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  @article{journals/vi/NetzelVEOWH17, abstract = {We investigate task performance and reading characteristics for scatterplots (Cartesian coordinates) and parallel coordinates. In a controlled eye-tracking study, we asked 24 participants to assess the relative distance of points in multidimensional space, depending on the diagram type (parallel coordinates or a horizontal collection of scatterplots), the number of data dimensions (2, 4, 6, or 8), and the relative distance between points (15%, 20%, or 25%). For a given reference point and two target points, we instructed participants to choose the target point that was closer to the reference point in multidimensional space. We present a visual scanning model that describes different strategies to solve this retrieval task for both diagram types, and propose corresponding hypotheses that we test using task completion time, accuracy, and gaze positions as dependent variables. Our results show that scatterplots outperform parallel coordinates significantly in 2 dimensions, however, the task was solved more quickly and more accurately with parallel coordinates in 8 dimensions. The eye-tracking data further shows significant differences between Cartesian and parallel coordinates, as well as between different numbers of dimensions. For parallel coordinates, there is a clear trend toward shorter fixations and longer saccades with increasing number of dimensions. Using an area-of-interest (AOI) based approach, we identify different reading strategies for each diagram type: For parallel coordinates, the participants’ gaze frequently jumped back and forth between pairs of axes, while axes were rarely focused on when viewing Cartesian coordinates. We further found that participants’ attention is biased: toward the center of the whole plotfor parallel coordinates and skewed to the center/left side for Cartesian coordinates. We anticipate that these results may support the design of more effective visualizations for multidimensional data.}, author = {Netzel, Rudolf and Vuong, Jenny and Engelke, Ulrich and O'Donoghue, Seán I. and Weiskopf, Daniel and Heinrich, Julian}, doi = {10.1016/j.visinf.2017.11.001}, ee = {https://doi.org/10.1016/j.visinf.2017.11.001}, journal = {Visual Informatics}, number = 2, pages = {118-131}, title = {Comparative Eye-tracking Evaluation of Scatterplots and Parallel Coordinates}, url = {https://doi.org/10.1016/j.visinf.2017.11.001}, volume = 1, year = 2017 }
  Link
  https://doi.org/10.1016/j.visinf.2017.11.001
2. Rodrigues, Nils ; Netzel, Rudolf ; Ullah, Kazi Riaz ; Burch, Michael ; Schultz, Alexander ; Burger, Bruno ; Weiskopf, Daniel: Visualization of Time Series Data with Spatial Context: Communicating the Energy Production of Power Plants. In: Proceedings of the ACM Symposium on Visual Information Communication and Interaction (VINCI), Proceedings of the ACM Symposium on Visual Information Communication and Interaction (VINCI), 2017, S. 37–44
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  @inproceedings{508aec6171ff4459a91346c2fa5f8214, abstract = {Visualizing time series data with a spatial context is a problem that appears more and more often, since small and lightweight GPS devices allow us to enrich the time series data with position information. One example is the visualization of the energy output of power plants. We present a web-based application that aims to provide information about the energy production of a specified region, along with location information about the power plants. The application is intended to be used as a solid data basis for political discussions, nudging, and story telling about the German energy transition to renewables, called "Energiewende". It was therefore designed to be intuitive, easy to use, and provide information for a broad spectrum of users that do not need any domain-specific knowledge. Users are able to select different categories of power plants and look up their positions on an overview map. Glyphs indicate their exact positions and a selection mechanism allows users to compare the power output on different time scales using stacked area charts or ThemeRivers. As an evaluation of the application, we have collected web access statistics and conducted an online survey with respect to the intuitiveness, usability, and informativeness.}, author = {Rodrigues, Nils and Netzel, Rudolf and Ullah, Kazi Riaz and Burch, Michael and Schultz, Alexander and Burger, Bruno and Weiskopf, Daniel}, booktitle = {Proceedings of the ACM Symposium on Visual Information Communication and Interaction (VINCI)}, doi = {https://doi.org/10.1145/3105971.3105982}, pages = {37-44}, title = {Visualization of Time Series Data with Spatial Context: Communicating the Energy Production of Power Plants}, url = {https://dl.acm.org/doi/10.1145/3105971.3105982}, year = 2017 }
  Link
  https://dl.acm.org/doi/10.1145/3105971.3105982
3. Netzel, Rudolf ; Hlawatsch, Marcel ; Burch, Michael ; Balakrishnan, Sanjeev ; Schmauder, Hansjörg ; Weiskopf, Daniel: An Evaluation of Visual Search Support in Maps. In: IEEE (Hrsg.) IEEE Transactions on Visualization and Computer Graphics, IEEE Transactions on Visualization and Computer Graphics. Bd. 23 (2017), Nr. 1
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  @article{cee19e8b01594f79a9b592fbfcb1db2d, author = {Netzel, Rudolf and Hlawatsch, Marcel and Burch, Michael and Balakrishnan, Sanjeev and Schmauder, Hansjörg and Weiskopf, Daniel}, editor = {IEEE}, journal = { IEEE Transactions on Visualization and Computer Graphics}, number = 1, privnote = {uid:2327}, title = {An Evaluation of Visual Search Support in Maps}, url = {http://dx.doi.org/10.1109/TVCG.2016.2598898}, volume = 23, year = 2017 }
  Link
  http://dx.doi.org/10.1109/TVCG.2016.2598898
2016
1. Kumar, Ayush ; Netzel, Rudolf ; Burch, Michael ; Weiskopf, Daniel ; Mueller, Klaus: Multi-Similarity Matrices of Eye Movement Data. In: 2016, E. (Hrsg.) ; 2016, E. (Hrsg.): , 2016
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  @inproceedings{ff88fe10c2f644a181ac605f3910e53d, author = {Kumar, Ayush and Netzel, Rudolf and Burch, Michael and Weiskopf, Daniel and Mueller, Klaus}, editor = {2016, ETVIS}, privnote = {uid:2292}, title = {Multi-Similarity Matrices of Eye Movement Data}, year = 2016 }
2. Netzel, Rudolf ; Burch, Michael ; Weiskopf, Daniel: User Performance and Reading Strategies for Metro Maps: An Eye Tracking Study. In: Spatial Cognition and Computation, Special Issue: Eye Tracking for Spatial Research, Spatial Cognition and Computation, Special Issue: Eye Tracking for Spatial Research., Taylor & Francis (2016)
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  @article{ff91b49505474a09b9c3dbe7bd4dc313, abstract = {We conducted a controlled empirical eye tracking study with 40 participants using schematic metro maps. The study focused on two aspects: determining different reading strategies and assessing user performance. We considered the following factors: color encoding (color vs. gray-scale), map complexity (three levels), and task difficulty (three levels). There was one type of task: find a route from a start to a target location and state the number of transfers that have to be performed. To identify reading strategies, we annotated fixations of scanpaths, computed a transition matrix of each annotated scanpath, and used these matrices as input to cluster scanpaths into groups of similar behavior. We show how these reading strategies relate to the geodesic structure of the scanpaths' fixations projected onto the geodesic line that connects start and target locations. The analysis of the eye tracking data is complemented by statistical inference working on two eye tracking metrics (average fixation duration and saccade length). User performance was evaluated with a statistical analysis of task correctness and completion time. Our study shows that the design factors have a significant impact on user task performance. Also, we were able to identify typical reading strategies like directly finding a path from start to target location. Often, participants check the correctness of their result multiple times by moving back and forth between start and target. Our findings also indicate that the choice of reading strategies does not depend on whether color or gray-scale encoding is used.}, author = {Netzel, Rudolf and Burch, Michael and Weiskopf, Daniel}, doi = {http://dx.doi.org/10.1080/13875868.2016.1226839}, journal = {Spatial Cognition and Computation, Special Issue: Eye Tracking for Spatial Research}, publisher = {Taylor & Francis}, title = {User Performance and Reading Strategies for Metro Maps: An Eye Tracking Study}, url = {https://www.tandfonline.com/doi/full/10.1080/13875868.2016.1226839}, year = 2016 }
  Link
  https://www.tandfonline.com/doi/full/10.1080/13875868.2016.1226839
3. Burch, Michael ; Netzel, Rudolf ; Weiskopf, Daniel: How Map Design Can Benefit From Eye Tracking. In: BCS/SoC Mapping Conference, BCS/SoC Mapping Conference, 2016
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  @inproceedings{afa99fa1d4e94e268915757d88ea5153, author = {Burch, Michael and Netzel, Rudolf and Weiskopf, Daniel}, booktitle = {BCS/SoC Mapping Conference}, privnote = {uid:2264}, title = {How Map Design Can Benefit From Eye Tracking}, year = 2016 }
4. Netzel, Rudolf ; Weiskopf, Daniel: Hilbert Attention Maps for Visualizing Spatiotemporal Gaze Data. In: 2016, E. (Hrsg.) ; 2016, E. (Hrsg.): , 2016
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  @inproceedings{88e5b4a3271a466998fb4f42cba3a9f0, author = {Netzel, Rudolf and Weiskopf, Daniel}, editor = {2016, ETVIS}, privnote = {uid:2289}, title = {Hilbert Attention Maps for Visualizing Spatiotemporal Gaze Data}, year = 2016 }
5. Burch, Michael ; Woods, Robin ; Netzel, Rudolf ; Weiskopf, Daniel: The Challenges of Designing Metro Maps. In: Proceedings of the 11th Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications, Proceedings of the 11th Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications. (2016)
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  @article{0e0d961a977d41babcd4652b5953e4ef, author = {Burch, Michael and Woods, Robin and Netzel, Rudolf and Weiskopf, Daniel}, journal = {Proceedings of the 11th Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications}, privnote = {uid:2210}, title = {The Challenges of Designing Metro Maps}, url = {http://dx.doi.org/10.5220/0005679601950202}, year = 2016 }
  Link
  http://dx.doi.org/10.5220/0005679601950202
6. Netzel, Rudolf ; Burch, Michael ; Weiskopf, Daniel: Interactive Scanpath-Oriented Annotation of Fixations. In: ACM (Hrsg.) Proceedings of the Ninth Biennial ACM Symposium on Eye Tracking Research & Applications, Proceedings of the Ninth Biennial ACM Symposium on Eye Tracking Research & Applications. (2016)
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  @article{NetzelETRA2016, author = {Netzel, Rudolf and Burch, Michael and Weiskopf, Daniel}, editor = {ACM}, journal = {Proceedings of the Ninth Biennial ACM Symposium on Eye Tracking Research & Applications}, privnote = {uid:2209}, title = {Interactive Scanpath-Oriented Annotation of Fixations}, url = {http://dx.doi.org/10.1145/2857491.2857498}, year = 2016 }
  Link
  http://dx.doi.org/10.1145/2857491.2857498
7. Beck, Fabian ; Acurana, Yasett ; Blascheck, Tanja ; Netzel, Rudolf ; Weiskopf, Daniel: An Expert Evaluation of Word-Sized Visualizations for Analyzing Eye Movement Data. In: 2016, E. (Hrsg.) ; 2016, E. (Hrsg.): , 2016
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  @inproceedings{8064b63fc0864863a53ff1c28c856f7e, author = {Beck, Fabian and Acurana, Yasett and Blascheck, Tanja and Netzel, Rudolf and Weiskopf, Daniel}, editor = {2016, ETVIS}, privnote = {uid:2286}, title = {An Expert Evaluation of Word-Sized Visualizations for Analyzing Eye Movement Data}, year = 2016 }
8. Schulz, Christoph ; Nocaj, Arlind ; El-Assady, Mennatallah ; Frey, Steffen ; Hlawatsch, Marcel ; Hund, Michael ; Karch, Grzegorz Karol ; Netzel, Rudolf ; u. a.: Generative Data Models for Validation and Evaluation of Visualization Techniques. In: ACM (Hrsg.) ; ACM (Hrsg.): BELIV ’16: Beyond Time And Errors: Novel Evaluation Methods For Visualization, BELIV ’16: Beyond Time And Errors: Novel Evaluation Methods For Visualization, 2016
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  @inproceedings{2016SchulzGenerativeDataModels, author = {Schulz, Christoph and Nocaj, Arlind and El-Assady, Mennatallah and Frey, Steffen and Hlawatsch, Marcel and Hund, Michael and Karch, Grzegorz Karol and Netzel, Rudolf and Schätzle, Christin and Butt, Miriam and Keim, Daniel A. and Ertl, Thomas and Brandes, Ulrik and Weiskopf, Daniel}, booktitle = {BELIV '16: Beyond Time And Errors: Novel Evaluation Methods For Visualization}, editor = {ACM}, privnote = {uid:2282}, title = {Generative Data Models for Validation and Evaluation of Visualization Techniques}, url = {http://dx.doi.org/10.1145/2993901.2993907}, year = 2016 }
  Link
  http://dx.doi.org/10.1145/2993901.2993907
2014
1. Netzel, Rudolf ; Burch, Michael ; Weiskopf, Daniel: Comparative Eye Tracking Study on Node-Link Visualizations of Trajectories. In: IEEE (Hrsg.) IEEE Transactions on Visualization and Computer Graphics, IEEE Transactions on Visualization and Computer Graphics. Bd. 20 (2014), Nr. 12
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  @article{netzel2014, author = {Netzel, Rudolf and Burch, Michael and Weiskopf, Daniel}, editor = {IEEE}, journal = {IEEE Transactions on Visualization and Computer Graphics}, number = 12, privnote = {uid:1957}, title = {Comparative Eye Tracking Study on Node-Link Visualizations of Trajectories}, url = {http://dx.doi.org/10.1109/TVCG.2014.2346420}, volume = 20, year = 2014 }
  Link
  http://dx.doi.org/10.1109/TVCG.2014.2346420
2013
1. Netzel, Rudolf ; Weiskopf, Daniel: Texture-Based Flow Visualization. In: IEEE (Hrsg.) Computing in Science & Engineering, Computing in Science & Engineering. Bd. 15 (2013), Nr. 6. — Populärwissenschaftlicher Magazinartikel
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  @article{netzel2013, author = {Netzel, Rudolf and Weiskopf, Daniel}, booktitle = {Computing in Science & Engineering}, editor = {IEEE}, note = {Populärwissenschaftlicher Magazinartikel}, number = 6, privnote = {uid:1912}, title = {Texture-Based Flow Visualization}, url = {http://dx.doi.org/10.1109/MCSE.2013.131}, volume = 15, year = 2013 }
  Link
  http://dx.doi.org/10.1109/MCSE.2013.131
2012
1. Netzel, Rudolf ; Ament, Marco ; Burch, Michael ; Weiskopf, Daniel: Spectral Analysis of Higher-Order and BFECC Texture Advection. In: Workshop on Vision, Modeling and Visualization (VMV), Workshop on Vision, Modeling and Visualization (VMV), 2012
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  @inproceedings{Netzel2012, author = {Netzel, Rudolf and Ament, Marco and Burch, Michael and Weiskopf, Daniel}, booktitle = {Workshop on Vision, Modeling and Visualization (VMV)}, privnote = {uid:1496}, title = {Spectral Analysis of Higher-Order and BFECC Texture Advection}, url = {http://dx.doi.org/10.2312/PE/VMV/VMV12/087-094}, year = 2012 }
  Link
  http://dx.doi.org/10.2312/PE/VMV/VMV12/087-094
2. Höferlin, Benjamin ; Netzel, Rudolf ; Höferlin, Markus ; Weiskopf, Daniel ; Heidemann, Gunther: Inter-Active Learning of Ad-Hoc Classifiers for Video Visual Analytics. In: IEEE Conference on Visual Analytics Science and Technology (VAST), 2012, IEEE Conference on Visual Analytics Science and Technology (VAST), 2012, 2012
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  @inproceedings{Hoeferlin2012d, author = {Höferlin, Benjamin and Netzel, Rudolf and Höferlin, Markus and Weiskopf, Daniel and Heidemann, Gunther}, booktitle = {IEEE Conference on Visual Analytics Science and Technology (VAST), 2012}, privnote = {uid:1435}, title = {Inter-Active Learning of Ad-Hoc Classifiers for Video Visual Analytics}, url = {http://dx.doi.org/10.1109/VAST.2012.6400492}, year = 2012 }
  Link
  http://dx.doi.org/10.1109/VAST.2012.6400492

Rudolf Netzel

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