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Nils Rodrigues

Dipl.-Inf.

Doctoral Researcher
Institute for Visualization and Interactive Systems (VIS)
Weiskopf Group

Contact

+49 711 685 88263
Email
Business card (VCF)

Universitätsstraße 38
70569 Stuttgart
Deutschland
Room: 1.254

Publications

Publications:

2022
1. Schäfer, Peter ; Rodrigues, Nils ; Weiskopf, Daniel ; Storandt, Sabine: Group Diagrams for Simplified Representation of Scanpaths. 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) : ACM, 2022
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  @inproceedings{schafer2022group, abstract = {We instrument Group Diagrams (GDs) to reduce clutter in sets of eye-tracking scanpaths. Group Diagrams consist of trajectory subsets that cover, or represent, the whole set of trajectories with respect to some distance measure and an adjustable distance threshold. The original GDs allow for an application of various distance measures. We implement the GD framework and evaluate it on scanpaths that were collected by a former user study on public transit maps. We find that the Fréchet distance is the most appropriate measure to get meaningful results, yet it is flexible enough to cover outliers.We discuss several implementation-specific challenges and improve the scalability of the algorithm.}, author = {Schäfer, Peter and Rodrigues, Nils and Weiskopf, Daniel and Storandt, Sabine}, booktitle = {Proceedings of the ACM Symposium on Visual Information Communication and Interaction (VINCI)}, doi = {10.1145/3554944.3554971}, month = {08}, publisher = {ACM}, title = {Group Diagrams for Simplified Representation of Scanpaths}, url = {https://doi.org/10.1145/3554944.3554971}, year = 2022 }
  Link
  https://doi.org/10.1145/3554944.3554971
2. Angerbauer, Katrin ; Rodrigues, Nils ; Cutura, Rene ; Öney, Seyda ; Pathmanathan, Nelusa ; Morariu, Cristina ; Weiskopf, Daniel ; Sedlmair, Michael: Accessibility for Color Vision Deficiencies: Challenges and Findings of a Large Scale Study on Paper Figures. In: Proceedings of the 2022 CHI Conference on Human Factors in Computing Systems, Proceedings of the 2022 CHI Conference on Human Factors in Computing Systems. New Orleans, LA, USA : Association for Computing Machinery, 2022 — ISBN 9781450391573
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  @inproceedings{10.1145/3491102.3502133, abstract = {We present an exploratory study on the accessibility of images in publications when viewed with color vision deficiencies (CVDs). The study is based on 1,710 images sampled from a visualization dataset (VIS30K) over five years. We simulated four CVDs on each image. First, four researchers (one with a CVD) identified existing issues and helpful aspects in a subset of the images. Based on the resulting labels, 200 crowdworkers provided  30,000 ratings on present CVD issues in the simulated images. We analyzed this data for correlations, clusters, trends, and free text comments to gain a first overview of paper figure accessibility. Overall, about 60 % of the images were rated accessible. Furthermore, our study indicates that accessibility issues are subjective and hard to detect. On a meta-level, we reflect on our study experience to point out challenges and opportunities of large-scale accessibility studies for future research directions.}, address = {New York, NY, USA}, articleno = {134}, author = {Angerbauer, Katrin and Rodrigues, Nils and Cutura, Rene and \"{O}ney, Seyda and Pathmanathan, Nelusa and Morariu, Cristina and Weiskopf, Daniel and Sedlmair, Michael}, booktitle = {Proceedings of the 2022 CHI Conference on Human Factors in Computing Systems}, doi = {10.1145/3491102.3502133}, isbn = {9781450391573}, location = {New Orleans, LA, USA}, numpages = {23}, publisher = {Association for Computing Machinery}, series = {CHI '22}, title = {Accessibility for Color Vision Deficiencies: Challenges and Findings of a Large Scale Study on Paper Figures}, url = {https://doi.org/10.1145/3491102.3502133}, year = 2022 }
  Link
  https://doi.org/10.1145/3491102.3502133
3. Rodrigues, Nils ; Schulz, Christoph ; Doring, Soren ; Baumgartner, Daniel ; Krake, Tim ; Weiskopf, Daniel: Relaxed Dot Plots: Faithful Visualization of Samples and Their Distribution. In: IEEE Transactions on Visualization and Computer Graphics, IEEE Transactions on Visualization and Computer Graphics. (2022), S. 59:1-59:7
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  @article{9904443, abstract = {We introduce relaxed dot plots as an improvement of nonlinear dot plots for unit visualization. Our plots produce more faithful data representations and reduce moire´ effects. Their contour is based on a customized kernel frequency estimation to match the shape of the distribution of underlying data values. Previous nonlinear layouts introduce column-centric nonlinear scaling of dot diameters for visualization of high-dynamic-range data with high peaks. We provide a mathematical approach to convert that column-centric scaling to our smooth envelope shape. This formalism allows us to use linear, root, and logarithmic scaling to find ideal dot sizes. Our method iteratively relaxes the dot layout for more correct and aesthetically pleasing results. To achieve this, we modified Lloyd's algorithm with additional constraints and heuristics. We evaluate the layouts of relaxed dot plots against a previously existing nonlinear variant and show that our algorithm produces less error regarding the underlying data while establishing the blue noise property that works against moire´ effects. Further, we analyze the readability of our relaxed plots in three crowd-sourced experiments. The results indicate that our proposed technique surpasses traditional dot plots.}, author = {Rodrigues, Nils and Schulz, Christoph and Doring, Soren and Baumgartner, Daniel and Krake, Tim and Weiskopf, Daniel}, doi = {10.1109/TVCG.2022.3209429}, journal = {IEEE Transactions on Visualization and Computer Graphics}, pages = {59:1-59:7}, title = {Relaxed Dot Plots: Faithful Visualization of Samples and Their Distribution}, url = {https://doi.org/10.1109/TVCG.2022.3209429}, year = 2022 }
  Link
  https://doi.org/10.1109/TVCG.2022.3209429
4. Chiossi, Francesco ; Zagermann, Johannes ; Karolus, Jakob ; Rodrigues, Nils ; Balestrucci, Priscilla ; Weiskopf, Daniel ; Ehinger, Benedikt ; Feuchtner, Tiare ; u. a.: Adapting visualizations and interfaces to the user. In: it - Information Technology, it - Information Technology. Bd. 64 (2022), Nr. 4–5, S. 133–143
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  @article{ChiossiZagermannKarolusRodriguesBalestrucciWeiskopfEhingerFeuchtnerReitererChuangErnstBullingMayerSchmidt+2022, abstract = {Adaptive visualization and interfaces pervade our everyday tasks to improve interaction from the point of view of user performance and experience. This approach allows using several user inputs, whether physiological, behavioral, qualitative, or multimodal combinations, to enhance the interaction. Due to the multitude of approaches, we outline the current research trends of inputs used to adapt visualizations and user interfaces. Moreover, we discuss methodological approaches used in mixed reality, physiological computing, visual analytics, and proficiency-aware systems. With this work, we provide an overview of the current research in adaptive systems.}, author = {Chiossi, Francesco and Zagermann, Johannes and Karolus, Jakob and Rodrigues, Nils and Balestrucci, Priscilla and Weiskopf, Daniel and Ehinger, Benedikt and Feuchtner, Tiare and Reiterer, Harald and Chuang, Lewis L. and Ernst, Marc and Bulling, Andreas and Mayer, Sven and Schmidt, Albrecht}, doi = {10.1515/itit-2022-0035}, journal = {it - Information Technology}, number = {4–5}, pages = {133–143}, title = {Adapting visualizations and interfaces to the user}, url = {https://doi.org/10.1515/itit-2022-0035}, volume = 64, year = 2022 }
  Link
  https://doi.org/10.1515/itit-2022-0035
5. Rodrigues, Nils ; Shao, Lin ; Yan, Jia Jun ; Schreck, Tobias ; Weiskopf, Daniel: Eye Gaze on Scatterplot: Concept and First Results of Recommendations for Exploration of SPLOMs Using Implicit Data Selection. In: 2022 Symposium on Eye Tracking Research and Applications, 2022 Symposium on Eye Tracking Research and Applications. Seattle, WA, USA : Association for Computing Machinery, 2022 — ISBN 9781450392525, S. 59:1-59:7
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  @inproceedings{10.1145/3517031.3531165, abstract = {We propose a three-step concept and visual design for supporting the visual exploration of high-dimensional data in scatterplots through eye-tracking. First, we extract subsets in the underlying data using existing classifications, automated clustering algorithms, or eye-tracking. For the latter, we map gaze to the underlying data dimensions in the scatterplot. Clusters of data points that have been the focus of the viewers’ gaze are marked as clusters of interest (eye-mind hypothesis). In a second step, our concept extracts various properties from statistics and scagnostics from the clusters. The third step uses these measures to compare the current data clusters from the main scatterplot to the same data in other dimensions. The results enable analysts to retrieve similar or dissimilar views as guidance to explore the entire data set. We provide a proof-of-concept implementation as a test bench and describe a use case to show a practical application and initial results.}, address = {New York, NY, USA}, articleno = {59}, author = {Rodrigues, Nils and Shao, Lin and Yan, Jia Jun and Schreck, Tobias and Weiskopf, Daniel}, booktitle = {2022 Symposium on Eye Tracking Research and Applications}, doi = {10.1145/3517031.3531165}, isbn = {9781450392525}, location = {Seattle, WA, USA}, numpages = {7}, pages = {59:1-59:7}, publisher = {Association for Computing Machinery}, series = {ETRA '22}, title = {Eye Gaze on Scatterplot: Concept and First Results of Recommendations for Exploration of SPLOMs Using Implicit Data Selection}, url = {https://doi.org/10.1145/3517031.3531165}, year = 2022 }
  Link
  https://doi.org/10.1145/3517031.3531165
2020
1. Öney, Seyda ; Rodrigues, Nils ; Becher, Michael ; Reina, Guido ; Ertl, Thomas ; Sedlmair, Michael ; Weiskopf, Daniel: Evaluation of Gaze Depth Estimation from Eye Tracking in Augmented Reality. In: Proceedings of the Symposium on Eye Tracking Research & Applications-Short Paper (ETRA-SP), Proceedings of the Symposium on Eye Tracking Research & Applications-Short Paper (ETRA-SP) : ACM, 2020, S. 49:1-49:5
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  @inproceedings{oney_evaluation_2020, abstract = {Gaze tracking in 3D has the potential to improve interaction with objects and visualizations in augmented reality. However, previous research showed that subjective perception of distance varies between real and virtual surroundings. We wanted to determine whether objectively measured 3D gaze depth through eye tracking also exhibits differences between entirely real and augmented environments. To this end, we conducted an experiment (N = 25) in which we used Microsoft HoloLens with a binocular eye tracking add-on from Pupil Labs. Participants performed a task that required them to look at stationary real and virtual objects while wearing a HoloLens device. We were not able to find significant differences in the gaze depth measured by eye tracking. Finally, we discuss our findings and their implications for gaze interaction in immersive analytics, and the quality of the collected gaze data.}, author = {Öney, Seyda and Rodrigues, Nils and Becher, Michael and Reina, Guido and Ertl, Thomas and Sedlmair, Michael and Weiskopf, Daniel}, booktitle = {Proceedings of the Symposium on Eye Tracking Research & Applications-Short Paper (ETRA-SP)}, doi = {10.1145/3379156.3391835}, pages = {49:1-49:5}, publisher = {ACM}, title = {Evaluation of Gaze Depth Estimation from Eye Tracking in Augmented Reality}, url = {https://doi.org/10.1145/3379156.3391835}, year = 2020 }
  Link
  https://doi.org/10.1145/3379156.3391835
2. Rodrigues, Nils ; Schulz, Christoph ; Lhuillier, Antoine ; Weiskopf, Daniel: Cluster-Flow Parallel Coordinates: Tracing Clusters Across Subspaces. In: Proceedings of the Graphics Interface Conference (GI) (forthcoming), Proceedings of the Graphics Interface Conference (GI) (forthcoming), 2020, S. 0:1-0:11
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  @inproceedings{rodrigues2020clusterflow, abstract = {We present a novel variant of parallel coordinates plots (PCPs) in which we show clusters in 2D subspaces of multivariate data and emphasize flow between them. We achieve this by duplicating and stacking individual axes vertically. On a high level, our cluster-flow layout shows how data points move from one cluster to another in different subspaces. We achieve cluster-based bundling and limit plot growth through the reduction of available vertical space for each duplicated axis. Although we introduce space between clusters, we preserve the readability of intra-cluster correlations by starting and ending with the original slopes from regular PCPs and drawing Hermite spline segments in between. Moreover, our rendering technique enables the visualization of small and large data sets alike. Cluster-flow PCPs can even propagate the uncertainty inherent to fuzzy clustering through the layout and rendering stages of our pipeline. Our layout algorithm is based on A*. It achieves an optimal result with regard to a novel set of cost functions that allow us to arrange axes horizontally (dimension ordering) and vertically (cluster ordering).}, author = {Rodrigues, Nils and Schulz, Christoph and Lhuillier, Antoine and Weiskopf, Daniel}, booktitle = {Proceedings of the Graphics Interface Conference (GI) (forthcoming)}, pages = {0:1-0:11}, title = {Cluster-Flow Parallel Coordinates: Tracing Clusters Across Subspaces}, url = {https://openreview.net/forum?id=oVHjlwLkl-}, year = 2020 }
  Link
  https://openreview.net/forum?id=oVHjlwLkl-
3. Pathmanathan, Nelusa ; Becher, Michael ; Rodrigues, Nils ; Reina, Guido ; Ertl, Thomas ; Weiskopf, Daniel ; Sedlmair, Michael: Eye vs. Head: Comparing Gaze Methods for Interaction in Augmented Reality. In: Proceedings of the Symposium on Eye Tracking Research & Applications (ETRA), Proceedings of the Symposium on Eye Tracking Research & Applications (ETRA). Stuttgart, Germany : ACM, 2020 — ISBN 9781450371346, S. 50:1-50:5
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  @inproceedings{10.1145/3379156.3391829, abstract = {Visualization in virtual 3D environments can provide a natural way for users to explore data. Often, arm and short head movements are required for interaction in augmented reality, which can be tiring and strenuous though. In an effort toward more user-friendly interaction, we developed a prototype that allows users to manipulate virtual objects using a combination of eye gaze and an external clicker device. Using this prototype, we performed a user study comparing four different input methods of which head gaze plus clicker was preferred by most participants.}, articleno = {50}, author = {Pathmanathan, Nelusa and Becher, Michael and Rodrigues, Nils and Reina, Guido and Ertl, Thomas and Weiskopf, Daniel and Sedlmair, Michael}, booktitle = {Proceedings of the Symposium on Eye Tracking Research & Applications (ETRA)}, doi = {10.1145/3379156.3391829}, isbn = {9781450371346}, location = {Stuttgart, Germany}, numpages = {5}, pages = {50:1-50:5}, publisher = {ACM}, title = {Eye vs. Head: Comparing Gaze Methods for Interaction in Augmented Reality}, url = {https://doi.org/10.1145/3379156.3391829}, year = 2020 }
  Link
  https://doi.org/10.1145/3379156.3391829
4. Kurzhals, Kuno ; Rodrigues, Nils ; Koch, Maurice ; Stoll, Michael ; Bruhn, Andres ; Bulling, Andreas ; Weiskopf, Daniel: Visual Analytics and Annotation of Pervasive Eye Tracking Video. In: Proceedings of the Symposium on Eye Tracking Research & Applications (ETRA), Proceedings of the Symposium on Eye Tracking Research & Applications (ETRA). Stuttgart, Germany : ACM, 2020 — ISBN 9781450371339, S. 16:1-16:9
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  @inproceedings{10.1145/3379155.3391326, abstract = {We propose a new technique for visual analytics and annotation of long-term pervasive eye tracking data for which a combined analysis of gaze and egocentric video is necessary. Our approach enables two important tasks for such data for hour-long videos from individual participants: (1) efficient annotation and (2) direct interpretation of the results. Exemplary time spans can be selected by the user and are then used as a query that initiates a fuzzy search of similar time spans based on gaze and video features. In an iterative refinement loop, the query interface then provides suggestions for the importance of individual features to improve the search results. A multi-layered timeline visualization shows an overview of annotated time spans. We demonstrate the efficiency of our approach for analyzing activities in about seven hours of video in a case study and discuss feedback on our approach from novices and experts performing the annotation task.}, articleno = {16}, author = {Kurzhals, Kuno and Rodrigues, Nils and Koch, Maurice and Stoll, Michael and Bruhn, Andres and Bulling, Andreas and Weiskopf, Daniel}, booktitle = {Proceedings of the Symposium on Eye Tracking Research & Applications (ETRA)}, doi = {10.1145/3379155.3391326}, isbn = {9781450371339}, location = {Stuttgart, Germany}, numpages = {9}, pages = {16:1-16:9}, publisher = {ACM}, title = {Visual Analytics and Annotation of Pervasive Eye Tracking Video}, url = {https://doi.org/10.1145/3379155.3391326}, year = 2020 }
  Link
  https://doi.org/10.1145/3379155.3391326
2019
1. Silva, Nelson ; Blascheck, Tanja ; Jianu, Radu ; Rodrigues, Nils ; Weiskopf, Daniel ; Raubal, Martin ; Schreck, Tobias: Eye Tracking Support for Visual Analytics Systems: Foundations, Current Applications, and Research Challenges. In: Krejtz, K. ; Sharif, B. (Hrsg.) ; Krejtz, K. ; Sharif, B. (Hrsg.): Proceedings of the Symposium on Eye Tracking Research & Applications (ETRA), Proceedings of the Symposium on Eye Tracking Research & Applications (ETRA) : ACM, 2019 — ISBN 978-1-4503-6709-7, S. 11:1-11:9
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  @inproceedings{conf/etra/SilvaBJRWRS19, abstract = {Visual analytics (VA) research provides helpful solutions for interactive visual data analysis when exploring large and complex datasets. Due to recent advances in eye tracking technology, promising opportunities arise to extend these traditional VA approaches. Therefore, we discuss foundations for eye tracking support in VA systems. We first review and discuss the structure and range of typical VA systems. Based on a widely used VA model, we present five comprehensive examples that cover a wide range of usage scenarios. Then, we demonstrate that the VA model can be used to systematically explore how concrete VA systems could be extended with eye tracking, to create supportive and adaptive analytics systems. This allows us to identify general research and application opportunities, and classify them into research themes. In a call for action, we map the road for future research to broaden the use of eye tracking and advance visual analytics.}, author = {Silva, Nelson and Blascheck, Tanja and Jianu, Radu and Rodrigues, Nils and Weiskopf, Daniel and Raubal, Martin and Schreck, Tobias}, booktitle = {Proceedings of the Symposium on Eye Tracking Research & Applications (ETRA)}, crossref = {conf/etra/2019}, doi = {10.1145/3314111.3319919}, editor = {Krejtz, Krzysztof and Sharif, Bonita}, ee = {https://doi.org/10.1145/3314111.3319919}, isbn = {978-1-4503-6709-7}, pages = {11:1-11:9}, publisher = {ACM}, title = {Eye Tracking Support for Visual Analytics Systems: Foundations, Current Applications, and Research Challenges}, url = {https://doi.org/10.1145/3314111.3319919}, year = 2019 }
  Link
  https://doi.org/10.1145/3314111.3319919
2. Schulz, Christoph ; Rodrigues, Nils ; Amann, Marco ; Baumgartner, Daniel ; Mielke, Arman ; Baumann, Christian ; Sedlmair, Michael ; Weiskopf, Daniel: A Framework for Pervasive Visual Deficiency Simulation. In: Proceedings of the IEEE Conference on Virtual Reality and 3D User Interfaces (VR), Proceedings of the IEEE Conference on Virtual Reality and 3D User Interfaces (VR), 2019, S. 1852–1857
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  @inproceedings{schulz2019framework, abstract = {We present a framework for rapid prototyping of pervasive visual deficiency simulation in the context of graphical interfaces, virtual reality, and augmented reality. Our framework facilitates the emulation of various visual deficiencies for a wide range of applications, which allows users with normal vision to experience combinations of conditions such as myopia, hyperopia, presbyopia, cataract, nyctalopia, protanopia, deuteranopia, tritanopia, and achromatopsia. Our framework provides an infrastructure to encourage researchers to evaluate visualization and other display techniques regarding visual deficiencies, and opens up the field of visual disease simulation to a broader audience. The benefits of our framework are easy integration, configuration, fast prototyping, and portability to new emerging hardware. To demonstrate the applicability of our framework, we showcase a desktop application and an Android application that transform commodity hardware into glasses for visual deficiency simulation. We expect that this work promotes a greater understanding of visual impairments, leads to better product design for the visually impaired, and forms a basis for research to compensate for these impairments as everyday help}, author = {Schulz, Christoph and Rodrigues, Nils and Amann, Marco and Baumgartner, Daniel and Mielke, Arman and Baumann, Christian and Sedlmair, Michael and Weiskopf, Daniel}, booktitle = {Proceedings of the IEEE Conference on Virtual Reality and 3D User Interfaces (VR)}, doi = {10.1109/VR44988.2019.9044164}, pages = {1852-1857}, title = {A Framework for Pervasive Visual Deficiency Simulation}, url = {https://ieeexplore.ieee.org/document/9044164}, year = 2019 }
  Link
  https://ieeexplore.ieee.org/document/9044164
3. Netzel, Rudolf ; Rodrigues, Nils ; Haug, Anja ; Weiskopf, Daniel: Compensation of Simultaneous Orientation Contrast in Superimposed Textures. In: Kerren, A. ; Hurter, C. ; Braz, J. (Hrsg.) ; Kerren, A. ; Hurter, C. ; Braz, J. (Hrsg.): Proceedings of the Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications (VISIGRAPP), Proceedings of the Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications (VISIGRAPP). Bd. 3: IVAPP : SciTePress, 2019 — ISBN 978-989-758-354-4, S. 48–57
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  @inproceedings{conf/grapp/NetzelRHW19, author = {Netzel, Rudolf and Rodrigues, Nils and Haug, Anja and Weiskopf, Daniel}, booktitle = {Proceedings of the Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications (VISIGRAPP)}, doi = {10.5220/0007356800480057}, editor = {Kerren, Andreas and Hurter, Christophe and Braz, José}, ee = {https://doi.org/10.5220/0007356800480057}, isbn = {978-989-758-354-4}, pages = {48-57}, publisher = {SciTePress}, title = {Compensation of Simultaneous Orientation Contrast in Superimposed Textures}, url = {http://www.scitepress.org/DigitalLibrary/Link.aspx?doi=10.5220/0007356800480057}, volume = {3: IVAPP}, year = 2019 }
  Link
  http://www.scitepress.org/DigitalLibrary/Link.aspx?doi=10.5220/0007356800480057
2018
1. Rodrigues, Nils ; Netzel, Rudolf ; Spalink, Joachim ; Weiskopf, Daniel: Multiscale Scanpath Visualization and Filtering. In: Chuang, L. L. ; Burch, M. ; Kurzhals, K. (Hrsg.) ; Chuang, L. L. ; Burch, M. ; Kurzhals, K. (Hrsg.): Proceedings of the Symposium on Eye Tracking and Visualization (ETVIS), Proceedings of the Symposium on Eye Tracking and Visualization (ETVIS) : ACM, 2018, S. 2:1-2:5
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  @inproceedings{conf/etra/RodriguesNSW18, abstract = {The analysis of eye-tracking data can be very useful when evaluating controlled user studies. To support the analysis in a fast and easy fashion, we have developed a web-based framework for a visual inspection of eye-tracking data and a comparison of scanpaths based on filtering of fixations and similarity measures. Concerning the first part, we introduce a multiscale aggregation of fixations and saccades based on a spatial partitioning that reduces visual clutter of overlaid scanpaths without changing the overall impression of large-scale eye movements. The multiscale technique abstracts the individual scanpaths and allows an analyst to visually identify clusters or patterns inherent to the gaze data without the need for lengthy precomputations. For the second part, we introduce an approach where analysts can remove fixations from a pair of scanpaths in order to increase the similarity between them. This can be useful to discover and understand reasons for dissimilarity between scanpaths, data cleansing, and outlier detection. Our implementation uses the MultiMatch algorithm to predict similarities after the removal of individual fixations. Finally, we demonstrate the usefulness of our techniques in a use case with scanpaths that were recorded in a study with metro maps.}, author = {Rodrigues, Nils and Netzel, Rudolf and Spalink, Joachim and Weiskopf, Daniel}, booktitle = {Proceedings of the Symposium on Eye Tracking and Visualization (ETVIS)}, doi = {10.1145/3205929.3205931}, editor = {Chuang, Lewis L. and Burch, Michael and Kurzhals, Kuno}, ee = {https://doi.org/10.1145/3205929.3205931}, pages = {2:1-2:5}, publisher = {ACM}, title = {Multiscale Scanpath Visualization and Filtering}, url = {https://dl.acm.org/doi/10.1145/3205929.3205931}, year = 2018 }
  Link
  https://dl.acm.org/doi/10.1145/3205929.3205931
2. Rodrigues, Nils ; Weiskopf, Daniel: Nonlinear Dot Plots. In: IEEE Transactions on Visualization and Computer Graphics, IEEE Transactions on Visualization and Computer Graphics. Bd. 24 (2018), Nr. 1, S. 616–625
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  @article{888e7816f6314cbeb56a29b239b290f7, abstract = {Conventional dot plots use a constant dot size and are typically applied to show the frequency distribution of small data sets. Unfortunately, they are not designed for a high dynamic range of frequencies. We address this problem by introducing nonlinear dot plots. Adopting the idea of nonlinear scaling from logarithmic bar charts, our plots allow for dots of varying size so that columns with a large number of samples are reduced in height. For the construction of these diagrams, we introduce an efficient two-way sweep algorithm that leads to a dense and symmetrical layout. We compensate aliasing artifacts at high dot densities by a specifically designed low-pass filtering method. Examples of nonlinear dot plots are compared to conventional dot plots as well as linear and logarithmic histograms. Finally, we include feedback from an expert review.}, author = {Rodrigues, Nils and Weiskopf, Daniel}, doi = {10.1109/TVCG.2017.2744018}, journal = {IEEE Transactions on Visualization and Computer Graphics}, number = 1, pages = {616-625}, title = {Nonlinear Dot Plots}, url = {http://dx.doi.org/10.1109/TVCG.2017.2744018}, volume = 24, year = 2018 }
  Link
  http://dx.doi.org/10.1109/TVCG.2017.2744018
2017
1. Rodrigues, Nils ; Weiskopf, Daniel: Nonlinear Dot Plots. In: IEEE Transactions on Visualization and Computer Graphics, IEEE Transactions on Visualization and Computer Graphics. Bd. 2018 (2017)
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  @article{9ff15069de89495e99cdd4cef875aa1a, author = {Rodrigues, Nils and Weiskopf, Daniel}, journal = {IEEE Transactions on Visualization and Computer Graphics}, privnote = {uid:2406}, title = {Nonlinear Dot Plots}, url = {http://dx.doi.org/10.1109/TVCG.2017.2744018}, volume = 2018, year = 2017 }
  Link
  http://dx.doi.org/10.1109/TVCG.2017.2744018
2. Rodrigues, Nils ; Burch, Michael ; Di Silvestro, Lorenzo ; Weiskopf, Daniel: A Visual Analytics Approach for Word Relevances in Multiple Texts. In: IV 2017, IV 2017, 2017
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  @inproceedings{rodrigues2017vaforwordrelevances, author = {Rodrigues, Nils and Burch, Michael and Di Silvestro, Lorenzo and Weiskopf, Daniel}, booktitle = {IV 2017}, privnote = {uid:2404}, title = {A Visual Analytics Approach for Word Relevances in Multiple Texts}, year = 2017 }
3. Schulz, Christoph ; Rodrigues, Nils ; Damarla, Krishna ; Henicke, Andreas ; Weiskopf, Daniel: Visual Exploration of Mainframe Workloads. In: Proceedings of the SIGGRAPH Asia Symposium on Visualization, Proceedings of the SIGGRAPH Asia Symposium on Visualization : ACM, 2017, S. 4:1-4:7
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  @inproceedings{Schulz2017Visual, abstract = {We present a visual analytics approach to support the workload management process for z/OS mainframes at IBM. This process typically requires the analysis of records consisting of 100 to 150 performance-related metrics, sampled over time. We aim at replacing the previous spreadsheet-based workflow with an easier, faster, and more scalable one regarding measurement periods and collected performance metrics. To achieve this goal, we collaborate with a developer embedded at IBM in a formative process. Based on that experience, we discuss the application background and formulate requirements to support decision making based on performance data for large-scale systems. Our visual approach helps analysts find outliers, patterns, and relations between performance metrics by data exploration through various visualizations. We demonstrate the usefulness and applicability of line plots, scatter plots, scatter plot matrices, parallel coordinates, and correlation matrices for workload management. Finally, we evaluate our approach in a qualitative user study with IBM domain experts.}, author = {Schulz, Christoph and Rodrigues, Nils and Damarla, Krishna and Henicke, Andreas and Weiskopf, Daniel}, booktitle = {Proceedings of the SIGGRAPH Asia Symposium on Visualization}, pages = {4:1-4:7}, publisher = {ACM}, title = {Visual Exploration of Mainframe Workloads}, url = {http://dx.doi.org/10.1145/3139295.3139312}, venue = {Article No. 4}, year = 2017 }
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  http://dx.doi.org/10.1145/3139295.3139312
4. 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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  BibTeX
  @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
2014
1. Burch, Michael ; Lohmann, Steffen ; Beck, Fabian ; Rodrigues, Nils ; Di Silvestro, Lorenzo ; Weiskopf, Daniel: RadCloud: Visualizing Multiple Texts with Merged Word Clouds. In: Proceedings of the 18th International Conference on Information Visualisation (IV ’14), Proceedings of the 18th International Conference on Information Visualisation (IV ’14) : IEEE, 2014
  - BibTeX
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  BibTeX
  @inproceedings{82254da6cf2647cfae74d0372f3587e5, author = {Burch, Michael and Lohmann, Steffen and Beck, Fabian and Rodrigues, Nils and Di Silvestro, Lorenzo and Weiskopf, Daniel}, booktitle = {Proceedings of the 18th International Conference on Information Visualisation (IV '14)}, privnote = {uid:1913}, publisher = {IEEE}, title = {RadCloud: Visualizing Multiple Texts with Merged Word Clouds}, url = {http://dx.doi.org/10.1109/IV.2014.72}, year = 2014 }
  Link
  http://dx.doi.org/10.1109/IV.2014.72

Nils Rodrigues

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