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31st International Conference on Multimedia Modeling, MMM 2025

作者： Stroh, Michael Kloda, Vojtěch Verner, Benjamin Vopálková, Zuzana Buchmüller, Raphael Jäckl, Bastian Hajko, Jakub Lokoč, Jakub Visual Computing Department of Computer Science Faculty of Natural Sciences Konstanz University Konstanz Germany SIRET Research Group Department of Software Engineering Faculty of Mathematics and Physics Charles University Prague Czech Republic Data Analysis and Visualization Department of Computer Science Faculty of Natural Sciences Konstanz University Konstanz Germany

ISBN: (纸本)9789819620739

We present a third version of the PraK system designed around an effective text-image and image-image search model. The system integrates sub-image search options for localized context search for CLIP and image color/texture and interfaces tailored to specific task types. A user study shows the benefits of sub-image search in homogeneous video collections. We further enhance the user experience of the PraK framework by re-designing the frontend and introducing task-specific views. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Video analysis

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Building a dynamic opinion dashboard to categorize tweets for real-time sentiment analysis

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International Journal of Information Technology (Singapore) 2025年 1-7页

作者： Adekoya-Cole, Temitope Fernando, Sandra Maroju, Abhilash Samal, Chandra Kanta Aggarwal, Saurabh Brahma, Biswajit Assistive Technology Research Group SCDM London Metropolitan University London United Kingdom Department of Information Technology University of the Cumberlands Williamsburg United States Department of Computer Science Acharya Narendra Dev College Delhi University Delhi India San Jose State University San Jose United States Senior Data & Visualization Engineer McKesson Corporation 32559 Lake Bridgeport St Fremont United States

Twitter, a popular social media, and networking tool has evolved into an important source of real-time news and a hub for public opinions. Using Twitter data, the given paper investigates the possibility of applying sentiment analysis to identify tweets as positive, negative, or neutral and then presenting the results visually, resulting in an in-depth analysis of public opinion. To do this, a dynamic opinion dashboard is designed comprising three modules viz. the user interface built on HTML, the backend application running in Python and Twitter, and the data source. The dashboard is built on a Python Flask app that interacts with a Twitter API to collect tweets, a sentiment analysis library to classify the tweets, and a variety of visualization libraries to create charts and graphs. The proposed dashboard provides users with real-time insights from text data in a user-friendly way. The proposed work is validated and compared with existing studies as well as pre-trained sentiment analysis models based on evaluation metrics such as accuracy, precision, recall and F1 score. © Crown 2025.

关键词： Data visualization Dynamic dashboard Sentiment analysis TweetNLP

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A User Guidance Approach for Passive Haptic Environments 14

A User Guidance Approach for Passive Haptic Environments

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14th Eurographics Symposium on Virtual Environments, EGVE 2008

作者： Steinicke, F. Welzel, H. Bruder, G. Hinrichs, K. Visualization and Computer Graphics Research Group Institute of Computer Science Westfälische Wilhelms-Universität Münster Germany

ISBN: (纸本)9783905673661

Traveling through virtual environments (VEs) by means of real walking is a challenging task since usually the size of the virtual world exceeds the size of the tracked interaction space. Redirected walking is one concept to solve this problem by guiding the user on a physical path which differs from the path the user visually perceives, for example, in head-mounted display (HMD) *** user can be redirected to certain locations in the physical space, in particular to real proxy objects which provide passive feedback. In such passive haptic environments, any number of virtual objects can be mapped to proxy objects having similar haptic properties, i. e., size, shape and texture. When the user is guided to corresponding proxy objects, s/he can sense virtual objects by touching their real world counterparts. Therefore it is vital to predict the user’s movements in the virtual world in order to recognize the target location. Based on the prediction a transformed path can be determined in the physical space on which the user is guided to the desired proxy object. In this paper we present concepts how a user’s path can be predicted reliably and how a corresponding path to a desired proxy object can be derived on which the user does not observe inconsistencies between vision and proprioception. © The Eurographics Association 2008.

关键词： Virtual reality

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Transitional environments enhance distance perception in immersive virtual reality systems 09

Transitional environments enhance distance perception in imm...

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APGV 2009: Symposium on Applied Perception in graphics and visualization

作者： Steinicke, Frank Bruder, Gerd Hinrichs, Klaus Lappe, Markus Ries, Brian Interrante, Victoria Visualization and Computer Graphics Research Group Germany Psychology Department II University of Münster Germany Department of Computer Science and Engineering University of Minnesota United States

ISBN: (纸本)9781605587431

Several experiments have provided evidence that ego-centric distances are perceived as compressed in immersive virtual environments relative to the real world. The principal factors responsible for this phenomenon have remained largely unknown. However, recent experiments suggest that when the virtual environment (VE) is an exact replica of a user's real physical surroundings, the person's distance perception improves. Furthermore, it has been shown that when users start their virtual reality (VR) experience in such a virtual replica and then gradually transition to a different VE, their sense of presence in the actual virtual world increases significantly. In this case the virtual replica serves as a transitional environment between the real and virtual world. In this paper we examine whether a person's distance estimation skills can be transferred from a transitional environment to a different VE. We have conducted blind walking experiments to analyze if starting the VR experience in a transitional environment can improve a person's ability to estimate distances in an immersive VR system. We found that users significantly improve their distance estimation skills when they enter the virtual world via a transitional environment. © 2009 ACM.

关键词： Virtual reality

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Augmentation techniques for efficient exploration in head-mounted display environments 10

Augmentation techniques for efficient exploration in head-mo...

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Proceedings of the 17th ACM Symposium on Virtual Reality Software and Technology

作者： Bolte, Benjamin Bruder, Gerd Steinicke, Frank Hinrichs, Klaus Lappe, Markus Visualization and Computer Graphics Group Department of Computer Science University of Münster Germany Psychology Department II University of Münster Germany

ISBN: (纸本)9781450304412

Physical characteristics and constraints of today's head-mounted displays (HMDs) often impair interaction in immersive virtual environments (VEs). For instance, due to the limited field of view (FOV) subtended by the display units in front of the user's eyes more effort is required to explore a VE by head rotations than for exploration in the real world. In this paper we propose a combination of two augmentation techniques that have the potential to make exploration of VEs more efficient: (1) augmenting the geometric FOV (GFOV) used for rendering the VE, and (2) amplifying head rotations while the user changes her head orientation. In order to identify how much manipulation can be applied without users noticing, we conducted two psychophysical experiments in which we analyzed subjects' ability to discriminate between virtual and real head pitch and roll rotations while three different geometric FOVs were used. Our results show that the combination of both techniques has great potential to support efficient exploration of VEs. We found that virtual pitch and roll rotations can be amplified by 30% and 44% respectively, when the GFOV matches the subject's estimation of the most natural FOV. This leads to a possible reduction of the user's effort required to explore the VE using a combination of both techniques by approximately 25%. Copyright © 2010 by the Association for Computing Machinery, Inc.

关键词： Virtual reality

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MoireGraphs: Radial focus+context visualization and interaction for graphs with visual nodes

MoireGraphs: Radial focus+context visualization and interact...

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9th Annual IEEE Symposium on Information visualization, InfoVis 2003

作者： Jankun-Kelly, T.J. Ma, Kwan-Liu Department of Computer Science and Engineering Mississippi State University MS 39762 United States Visualization and Graphics Research Group Department of Computer Science University of California Davis CA 95616 United States

ISBN: (纸本)0780381548

Graph and tree visualization techniques enable interactive exploration of complex relations while communicating topology. However, most existing techniques have not been designed for situations where visual information such as images is also present at each node and must be displayed. This paper presents MoireGraphs to address this need. MoireGraphs combine a new focus+context radial graph layout with a suite of interaction techniques (focus strength changing, radial rotation, level highlighting, secondary foci, animated transitions and node information) to assist in the exploration of graphs with visual nodes. The method is scalable to hundreds of displayed visual nodes. © 2003 IEEE.

关键词： visualization

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Presence-enhancing real walking user interface for first-person video games

Presence-enhancing real walking user interface for first-per...

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2009 ACM SIGGRAPH Symposium on Video Games, Sandbox '09

作者： Steinicke, Frank Bruder, Gerd Hinrichs, Klaus Steed, Anthony Visualization and Computer Graphics Research Group Department of Computer Science University of Munster Einsteinstraße 62 48149 Munster Germany Virtual Environments and Computer Graphics Group Department of Computer Science University College London Gower Street London WC1E 6BT United Kingdom

ISBN: (纸本)9781605585147

For most first-person video games it is important that players have a high level of feeling presence in the displayed game environment. Virtual reality (VR) technologies have enormous potential to enhance gameplay since players can experience the game immersively from the perspective of the player's virtual character. However, the VR technology itself, such as tracking devices and cabling, has until recently restricted the ability of users to really walk over long distances. In this paper we introduce a VR-based user interface for presence-enhancing gameplay with which players can explore the game environment in the most natural way, i. e., by real walking. While the player walks through the virtual game environment, we guide him/her on a physical path which is different from the virtual path and fits into the VR laboratory space. In order to further increase the VR experience, we introduce the concept of transitional environments. Such a transitional environment is a virtual replica of the laboratory environment, where the VR experience starts and which enables a gradual transition to the game environment. We have quantified how much humans can unknowingly be redirected and whether or not a gradual transition to a first-person game via a transitional environment increases the user's sense of presence. © 2009 ACM.

关键词： Virtual reality

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A Study of Transfer Function Generation for Time-Varying Volume Data 2

A Study of Transfer Function Generation for Time-Varying Vol...

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2nd IEEE TCVG / Eurographics International Workshop on Volume graphics, VG 2001

作者： Jankun-Kelly, T.J. Ma, Kwan-Liu Visualization And Graphics Research Group Center For Image Processing And Integrated Computing University Of California Department Of Computer Science DavisCA95616 United States

ISBN: (纸本)321183737X

The proper usage and creation of transfer functions for time-varying data sets is an often ignored problem in volume visualization. Although methods and guidelines exist for time-invariant data, little formal study for the timevarying case has been performed. This paper examines this problem, and reports the study that we have conducted to determine how the dynamic behavior of time-varying data may be captured by a single or small set of transfer functions. The criteria which dictate when more than one transfer function is needed were also investigated. Four data sets with different temporal characteristics were used for our study. Results obtained using two different classes of methods are discussed, along with lessons learned. These methods, including a new multiresolution opacity map approach, can be used for semi-automatic generation of transfer functions to explore large-scale time-varying data sets. © VG 2001. All rights reserved.

关键词： Transfer functions

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Multipla: Multiscale Pangenomic Locus Analysis

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computer graphics Forum 2025年

作者： van den Brandt, A. Ståhlbom, E. van Workum, F.J.M. van de Wetering, H. Lundström, C. Smit, S. Vilanova, A. Department of Mathematics and Computer Science Eindhoven University of Technology Netherlands Bioinformatics Group Wageningen University & Research Netherlands Department of Science and Technology Linköping University Sweden Sectra AB Sweden Center for Medical Image Science and Visualization Linköping University Sweden

Comparing gene organization across genomic sequences reveals insights into evolutionary and functional diversity among different organisms and varieties. Performing this task across many sequences, such as from a pangenome, is challenging because of the scale, the density of information, and the inherent variation. Often, analyses are centered on a genomic region of interest—a locus that might be associated with a trait or contain genes within the same family or biological pathway. Within these regions, researchers examine the conservation of gene order and orientation across organisms and assess sequence similarity, along with other gene content features such as gene size, to find biological variations or potential errors in the data. Automated methods in comparative genomics struggle to identify meaningful patterns due to varying and often unknown features of interest, leaving manual, time-intensive, and scalability-challenged visualization as the primary alternative. To address these challenges, we present a multiscale design for studying gene organization within pangenomes, developed in close collaboration with domain experts. Our tool, Multipla, enables users to explore organization at multiple levels of detail in a decluttered manner through layout abstractions, semantic zooming, and layouts with flexible distance definitions and feature selections, combining the advantages of manual and automated methods used in practice. We evaluate the design of Multipla through two pangenomic use cases and conclude with lessons learned from designing multiscale views for pangenomic locus analysis. © 2025 The Author(s). computer graphics Forum published by Eurographics - The European Association for computer graphics and John Wiley & Sons Ltd.

关键词： Visual analytics

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New Technique:Sketch-based rotation editing

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Journal of Zhejiang University-science C(computers and Electronics) 2011年第11期12卷 867-872页

作者： Yue XIE Wei-wei XU Yi-zhou YU Yan-lin WENG School of Computer Science and Technology Zhejiang University Hangzhou 310027 China Internet Graphics Group Microsoft Research Asia Beijing 100190 China Department of Computer Science University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA

We present a sketch-based rotation editing mations. Given a set of keyframe orientations of a rigid system for enriching rotational motion in keyframe ani- object, the user first edits its angular velocity trajectory by sketching curves, and then the system computes the altered rotational motion by solving a variational curve fitting problem. The solved rotational motion not only satisfies the orientation constraints at the keyframes, but also fits well the user-specified angular velocity trajectory. Our system is simple and easy to use. We demonstrate its usefulness by adding interesting and realistic rotational details to several keyframe animations.

关键词： Quaternions Keyframe interpolation Animation editing

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