Yao Wang

Institute for Visualisation and Interactive Systems, University of Stuttgart

+49 711 685 Pfaffenwaldring 5a, 70569 Stuttgart, Germany University of Stuttgart, SimTech Building, Room 01.031 Google Scholar

Biography

Yao Wang is a PhD student in the Perceptual User Interfaces group since September 2020. He holds a Bachelor's degree in Intelligence Science and Technology and a Master’s degree in Computer Science from Peking University. During his Master’s studies he specialized in Image Processing and 3D Reconstruction. His research interest now focuses on Visual Attention Modeling for abstract data visualizations.

Teaching

2021

Mensch-Computer-Interaktion (Teaching Assistant)Bachelor

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Supervision

2022

Predicting Recallability from Gaze Behaviour on InfoVis (B.Sc.) Sarra Bakhchali

 

Understanding Gaze Behaviour during Question-Answering on Information Visualisations (HiWi Project) Nuo Chen

2021

Scanpath Modeling on Information Visualisations (HiWi Project) Saiteja Malyala

 

Implementation of Analysis Toolbox for Information Visualisations (HiWi Project) Sruthi Radhakrishnan

 

Multi-view 3D Saliency (M.Sc.) Qi Dai

 

Joint Learning Model for Saliency and Scanpath Prediction (M.Sc.) Jiaqi Qin

 

QA Multi Duration Saliency Dataset Annotation on Data Visualizations by CodeCharts UI (HiWi Project) Luwei Liu

2020

Deep Learning Engineering in Saliency Modeling (HiWi Project) Wei Zhang

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Open Thesis Projects

 

Understanding Gaze Behaviour on Information Visualisations under Question-answeringMaster

 

Attention Based Element-level Saliency Modeling on Information VisualisationsMaster

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Publications

(Wang, Koch, Bâce, Weiskopf, & Bulling, 2022; Wang, Jiao, Bâce, & Bulling, 2021; Wang, Bâce, & Bulling, 2021; Wei, Wang, Li, Chen, & Wang, 2020; Hu et al., 2018; Chen, Wang, Lu, Chen, & Wang, 2018)

1. 

   Impact of Gaze Uncertainty on AOIs in Information Visualisations

   Yao Wang, Maurice Koch, Mihai Bâce, Daniel Weiskopf, Andreas Bulling

   ETRA Workshop on Eye Tracking and Visualization (ETVIS), pp. 1–6, 2022.

   Abstract Links BibTeX Project

   Gaze-based analysis of areas of interest (AOIs) is widely used in information visualisation research to understand how people explore visualisations or assess the quality of visualisations concerning key characteristics such as memorability. However, nearby AOIs in visualisations amplify the uncertainty caused by the gaze estimation error, which strongly influences the mapping between gaze samples or fixations and different AOIs. We contribute a novel investigation into gaze uncertainty and quantify its impact on AOI-based analysis on visualisations using two novel metrics: the Flipping Candidate Rate (FCR) and Hit Any AOI Rate (HAAR). Our analysis of 40 real-world visualisations, including human gaze and AOI annotations, shows that gaze uncertainty frequently and significantly impacts the analysis conducted in AOI-based studies. Moreover, we analysed four visualisation types and found that bar and scatter plots are usually designed in a way that causes more uncertainty than line and pie plots in gaze-based analysis.

   doi: 10.1145/3517031.3531166

   Paper: wang22_etvis.pdf

   Supplementary Material: wang22_etvis_sup.pdf

   @inproceedings{wang22_etvis, title = {Impact of Gaze Uncertainty on AOIs in Information Visualisations}, author = {Wang, Yao and Koch, Maurice and B{\^a}ce, Mihai and Weiskopf, Daniel and Bulling, Andreas}, year = {2022}, pages = {1--6}, booktitle = {ETRA Workshop on Eye Tracking and Visualization (ETVIS)}, doi = {10.1145/3517031.3531166} }

1. 

   VisRecall: Quantifying Information Visualisation Recallability via Question Answering

   Yao Wang, Chuhan Jiao, Mihai Bâce, Andreas Bulling

   arXiv:2112.15217, pp. 1–10, 2021.

   Abstract Links BibTeX Project

   Despite its importance for assessing the effectiveness of communicating information visually, fine-grained recallability of information visualisations has not been studied quantitatively so far. In this work we propose a visual question answering (VQA) paradigm to study visualisation recallability and present VisRecall — a novel dataset consisting of 200 visualisations that are annotated with crowd-sourced human (N = 305) recallability scores obtained from 1,000 questions from five question types. Furthermore, we present the first computational method to predict recallability of different visualisation elements, such as the title or specific data values. We report detailed analyses of our method on VisRecall and demonstrate that it outperforms several baselines in overall recallability and FE-, F-, RV-, and U-question recallability. We further demonstrate one possible application of our method: recommending the visualisation type that maximises user recallability for a given data source. Taken together, our work makes fundamental contributions towards a new generation of methods to assist designers in optimising visualisations.

   Paper: wang21_arxiv_2.pdf

   Paper Access: https://arxiv.org/abs/2112.15217

   Dataset: https://darus.uni-stuttgart.de/dataset.xhtml?persistentId=doi:10.18419/darus-2826

   @techreport{wang21_arxiv_2, title = {VisRecall: Quantifying Information Visualisation Recallability via Question Answering}, author = {Wang, Yao and Jiao, Chuhan and B{\^a}ce, Mihai and Bulling, Andreas}, year = {2021}, pages = {1--10}, url = {https://arxiv.org/abs/2112.15217} }
2. 

   Scanpath Prediction on Information Visualisations

   Yao Wang, Mihai Bâce, Andreas Bulling

   arXiv:2112.02340, pp. 1–14, 2021.

   Abstract Links BibTeX Project

   We propose Unified Model of Saliency and Scanpaths (UMSS)– a model that learns to predict visual saliency and scanpaths (i.e. sequences of eye fixations) on information visualisations. Although scanpaths provide rich information about the importance of different visualisation elements during the visual exploration process, prior work has been limited to predicting aggregated attention statistics, such as visual saliency. We present in-depth analyses of gaze behaviour for different information visualisation elements (e.g. Title, Label, Data) on the popular MASSVIS dataset. We show that while, overall, gaze patterns are surprisingly consistent across visualisations and viewers, there are also structural differences in gaze dynamics for different elements. Informed by our analyses, UMSS first predicts multi-duration element-level saliency maps, then probabilistically samples scanpaths from them. Extensive experiments on MASSVIS show that our method consistently outperforms state-of-the-art methods with respect to several, widely used scanpath and saliency evaluation metrics. Our method achieves a relative improvement in sequence score of 11.5 % for scanpath prediction, and a relative improvement in Pearson correlation coefficient of up to 23.6 % for saliency prediction. These results are auspicious and point towards richer user models and simulations of visual attention on visualisations without the need for any eye tracking equipment.

   Paper: wang21_arxiv.pdf

   Paper Access: https://arxiv.org/abs/2112.02340

   @techreport{wang21_arxiv, title = {Scanpath Prediction on Information Visualisations}, author = {Wang, Yao and B{\^a}ce, Mihai and Bulling, Andreas}, year = {2021}, pages = {1--14}, url = {https://arxiv.org/abs/2112.02340} }

1. 

   Semantic 3D Reconstruction with Learning MVS and 2D Segmentation of Aerial Images

   Zizhuang Wei, Yao Wang, Hongwei Li, Yisong Chen, Guoping Wang

   Applied Sciences, 10(4), pp. 1275, 2020.

   Abstract Links BibTeX Project

   Semantic modeling is a challenging task that has received widespread attention in recent years. With the help of mini Unmanned Aerial Vehicles (UAVs), multi-view high-resolution aerial images of large-scale scenes can be conveniently collected. In this paper, we propose a semantic Multi-View Stereo (MVS) method to reconstruct 3D semantic models from 2D images. Firstly, 2D semantic probability distribution is obtained by Convolutional Neural Network (CNN). Secondly, the calibrated cameras poses are determined by Structure from Motion (SfM), while the depth maps are estimated by learning MVS. Combining 2D segmentation and 3D geometry information, dense point clouds with semantic labels are generated by a probability-based semantic fusion method. In the final stage, the coarse 3D semantic point cloud is optimized by both local and global refinements. By making full use of the multi-view consistency, the proposed method efficiently produces a fine-level 3D semantic point cloud. The experimental result evaluated by re-projection maps achieves 88.4% Pixel Accuracy on the Urban Drone Dataset (UDD). In conclusion, our graph-based semantic fusion procedure and refinement based on local and global information can suppress and reduce the re-projection error.

   doi: 10.3390/app10041275

   Paper: wei20_as.pdf

   @article{wei20_as, title = {Semantic 3D Reconstruction with Learning MVS and 2D Segmentation of Aerial Images}, author = {Wei, Zizhuang and Wang, Yao and Li, Hongwei and Chen, Yisong and Wang, Guoping}, year = {2020}, journal = {Applied Sciences}, doi = {10.3390/app10041275}, pages = {1275}, volume = {10}, number = {4} }

1. 

   Sobel Heuristic Kernel for Aerial Semantic Segmentation

   Tao Hu, Yao Wang, Yisong Chen, Peng Lu, Heng Wang, Guoping Wang

   IEEE International Conference on Image Processing (ICIP), pp. 3074-3078, 2018.

   Abstract Links BibTeX Project

   Misclassification in semantic segmentation mostly occurs in the pixels around the semantic contour. In this work, we address the task of aerial image segmentation by borrowing the kernel prior from classical edge detecting operator. We propose a module called Sobel Heuristic Kernel(SHK). Our work makes several main contributions and experimentally shows good performance. To the best of our knowledge, we are the first to combine traditional edge detection method and deep learning method in semantic segmentation. Our SHK module reaches state of the art in the Inria Aerial Image Labeling dataset.

   doi: 10.1109/ICIP.2018.8451170

   Paper: hu18_icip.pdf

   @inproceedings{hu18_icip, title = {Sobel Heuristic Kernel for Aerial Semantic Segmentation}, author = {Hu, Tao and Wang, Yao and Chen, Yisong and Lu, Peng and Wang, Heng and Wang, Guoping}, year = {2018}, booktitle = {IEEE International Conference on Image Processing (ICIP)}, doi = {10.1109/ICIP.2018.8451170}, pages = {3074-3078} }
2. 

   Large-Scale Structure from Motion with Semantic Constraints of Aerial Images

   Yu Chen, Yao Wang, Peng Lu, Yisong Chen, Guoping Wang

   Proc. Chinese Conference on Pattern Recognition and Computer Vision (PRCV), pp. 347-359, 2018.

   Abstract Links BibTeX Project

   Structure from Motion (SfM) and semantic segmentation are two branches of computer vision. However, few previous methods integrate the two branches together. SfM is limited by the precision of traditional feature detecting method, especially in complicated scenes. As the research field of semantic segmentation thrives, we could gain semantic information of high confidence in each specific task with little effort. By utilizing semantic segmentation information, our paper presents a new way to boost the accuracy of feature point matching. Besides, with the semantic constraints taken from the result of semantic segmentation, a new bundle adjustment method with equality constraint is proposed. By exploring the sparsity of equality constraint, it indicates that constrained bundle adjustment can be solved by Sequential Quadratic Programming (SQP) efficiently. The proposed approach achieves state of the art accuracy, and, by grouping the descriptors together by their semantic labels, the speed of putative matches is slightly boosted. Moreover, our approach demonstrates a potential of automatic labeling of semantic segmentation. In a nutshell, our work strongly verifies that SfM and semantic segmentation benefit from each other.

   doi: 10.1007/978-3-030-03398-9_30

   Paper: chen18_prcv.pdf

   @inproceedings{chen18_prcv, title = {Large-Scale Structure from Motion with Semantic Constraints of Aerial Images}, author = {Chen, Yu and Wang, Yao and Lu, Peng and Chen, Yisong and Wang, Guoping}, year = {2018}, booktitle = {Proc. Chinese Conference on Pattern Recognition and Computer Vision (PRCV)}, doi = {10.1007/978-3-030-03398-9_30}, pages = {347-359} }