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arXiv 2021年

作者： Zhang, Jiaming Yang, Kailun Constantinescu, Angela Peng, Kunyu Müller, Karin Stiefelhagen, Rainer Computer Vision for Human-Computer Interaction Lab Center for Digital Accessibility and Assistive Technology Karlsruhe Institute of Technology Germany

Transparent objects, such as glass walls and doors, constitute architectural obstacles hindering the mobility of people with low vision or blindness. For instance, the open space behind glass doors is inaccessible, unless it is correctly perceived and interacted with. However, traditional assistive technologies rarely cover the segmentation of these safety-critical transparent objects. In this paper, we build a wearable system with a novel dualhead Transformer for Transparency (Trans4Trans) perception model, which can segment general- and transparent objects. The two dense segmentation results are further combined with depth information in the system to help users navigate safely and assist them to negotiate transparent *** propose a lightweight Transformer Parsing Module (TPM) to perform multi-scale feature interpretation in the transformer-based decoder. Benefiting from TPM, the double decoders can perform joint learning from corresponding datasets to pursue robustness, meanwhile maintain efficiency on a portable GPU, with negligible calculation increase. The entire Trans4Trans model is constructed in a symmetrical encoder-decoder architecture, which outperforms state-of-the-art methods on the test sets of Stanford2D3D and Trans10K-v2 datasets, obtaining mIoU of 45:13% and 75:14%, respectively. Through a user study and various pre-tests conducted in indoor and outdoor scenes, the usability and reliability of our assistive system have been extensively verified. Meanwhile, the Tran4Trans model has outstanding performances on driving scene datasets. On Cityscapes, ACDC, and DADA-seg datasets corresponding to common environments, adverse weather, and traffic accident scenarios, mIoU scores of 81:5%, 76:3%, and 39:2% are obtained, demonstrating its high efficiency and robustness for real-world transportation applications. Copyright © 2021, The Authors. All rights reserved.

关键词： computer vision

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Designing a collaborative learning activity in second life: An exploratory study in physics

Designing a collaborative learning activity in second life: ...

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International Conference on Advanced Learning Technologies

作者： Vrellis, Ioannis Papachristos, Nikiforos M. Bellou, Joan Avouris, Nikolaos Mikropoulos, Tassos A. Educational Approaches to Virtual Reality Technologies Lab. University of Ioannina Ioannina Greece Human-Computer Interaction Group Electrical and Computer Engineering Dept. University of Patras Greece

ISBN: (纸本)9780769540559

Multi-user virtual environments (MUVEs) seem to have great potential in education. Current educational uses of MUVEs seem to exploit them more as group interaction platforms and less as worlds where users learn by interacting and modifying the environment in a constructivist approach. There is also a need for systematic research efforts that will lead to guidelines and principles for designing and evaluating effective learning activities in MUVEs. This paper presents preliminary empirical results from an exploratory study with university students. A collaborative problem-based physics learning activity was designed in Second Life® (SL), following a constructivist approach. Students (n=30) collaborated "in-world" in pairs assisted by a tutor, in order to solve the problem. Data were gathered using a questionnaire and session recordings. The study focused on issues related to educational environment design, collaboration and instruction. Results indicate that satisfactory, engaging and effective collaborative learning activities can be realized in SL. © 2010 IEEE.

关键词： Students

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Improving recommendation accuracy by clustering social networks with trust

Improving recommendation accuracy by clustering social netwo...

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Workshop on Recommender Systems and the Social Web, Collocated with the 3rd ACM Conference on Recommender Systems, RecSys 2009

作者： DuBois, Tom Golbeck, Jennifer Kleint, John Srinivasan, Aravind Computer Science Department University of Maryland College Park MD 20741 United States Human-Computer Interaction Lab University of Maryland College Park MD 20741 United States

Social trust relationships between users in social networks speak to the similarity in opinions between the users, both in general and in important nuanced ways. They have been used in the past to make recommendations on the web. New trust metrics allow us to easily cluster users based on trust. In this paper, we investigate the use of trust clusters as a new way of improving recommendations. Previous work on the use of clusters has shown the technique to be relatively unsuccessful, but those clusters were based on similarity rather than trust. Our results show that when trust clusters are integrated into memory-based collaborative filtering algorithms, they lead to statistically significant improvements in accuracy. In this paper we discuss our methods, experiments, results, and potential future applications of the technique.

关键词： Collaborative filtering

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Children initiating and leading cooperative inquiry sessions 13

Children initiating and leading cooperative inquiry sessions

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12th International Conference on interaction Design and Children, IDC 2013

作者： Yip, Jason C. Foss, Elizabeth Bonsignore, Elizabeth Guha, Mona Leigh Norooz, Leyla Rhodes, Emily McNally, Brenna Papadatos, Panagis Golub, Evan Druin, Allison University of Maryland Human-Computer Interaction Lab. 2117 Hornbake South Wing College Park MD 20742 United States

ISBN: (纸本)9781450319188

Cooperative Inquiry is a Participatory Design method that involves children (typically 7-11 years old) as full partners with adults in the design of technologies intended for use by children. For many years, child designers have worked together with adults in Cooperative Inquiry approaches. However, in the past children have not typically initiated the design problems tackled by the intergenerational team, nor have they acted in leadership roles by conducting design sessions-until now. In this paper, we detail three case studies of Cooperative Inquiry in which children led the process of design, from initial problem formulation through one iteration of design review and elaboration. We frame our analysis from three perspectives on the design process: behaviors exhibited by child leaders and their fellow co-designers;supports required for child leaders;and views expressed by child leaders and their co-design cohort about the sessions that they led. Copyright 2013 ACM.

关键词： Design

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A user study trends in augmented reality and virtual reality research: A qualitative study with the past three years of the ISMAR and IEEE VR conference papers

A user study trends in augmented reality and virtual reality...

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2012 International Symposium on Ubiquitous Virtual Reality, ISUVR 2012

作者： Kim, Si Jung Jun Human-Computer Interaction Lab. School of Visual Arts and Design University of Central Florida Orlando FL 32826 United States

ISBN: (纸本)9780769547664

Augmented reality (AR) and virtual reality (VR) are becoming a part of everyday life with the advance of other technologies such as computer vision systems, sensing technologies, graphics, mobile computing, etc. Their primary goal is to help users achieve their goals effectively and efficiently with satisfaction. This paper describes the trends of how user studies have been incorporated into AR and VR papers published in two major conferences over the past three years. In addition, this paper presents implications on what needs to be taken into account when planning a user study in the field of AR and VR research. © 2012 IEEE.

关键词： Augmented reality

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Ad hoc communities on the road: Serendipitous social encounters to enhance tourist experiences 15

Ad hoc communities on the road: Serendipitous social encount...

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27th Australian computer-human interaction Conference, OzCHI 2015

作者： Thiel, Sarah-Kristin Foth, Marcus Schroeter, Ronald Urban Informatics Research Lab. Queensland University of Technology Brisbane Australia Centre for Human-Computer Interaction University of Salzburg Austria

ISBN: (纸本)9781450336734

Driving can be a lonely activity. While there has been a lot of research and technical inventions concerning car-tocar communication and passenger entertainment, there is still little work concerning connecting drivers. Whereas tourism is very much a social activity, drive tourists and road trippers have few options to communicate with fellow travelers. Our study is placed at the intersection of tourism and driving. It aims to enhance the trip experience during driving through social interaction. This paper explores how a mobile application that allows instant messaging between travelers sharing similar context can establish a temporary, ad hoc community and enhance the road trip experience. A prototype was developed and evaluated in various user and field studies. The study's outcomes are relevant for the design of future mobile tourist guides that benefit from community design, social encounters and recommendations.

关键词： User interfaces

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On the problem of determination of spring stiffness parameters for spring-mesh models

On the problem of determination of spring stiffness paramete...

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Medicine Meets Virtual Reality 16 - Parallel, Combinatorial, Convergent: NextMed by Design, MMVR 2008

作者： Quang Huy Viet, Huynh Hirai, Shinichi Shirai, Yoshiaki Yamaguchi, Satoshi Tanaka, Hiromi T. Kawasaki, Hiroshi Kawai, Yukiko Computer Vision and Graphics Laboratory Department of Information and Computer Science Saitama University Saitama Japan Laboratory for Integrated Machine Intelligence Department of Robotics Ritsumeikan University Kusatsu Japan Computer Vision Lab. Department of Human and Computer Intelligence Ritsumeikan University Kusatsu Japan Kawai Lab. Department of Computer Science Kyoto Sangyo University Kyoto Japan

ISBN: (纸本)9781586038229

On account of having real-time behavior and being easy to implement, spring meshes have been used for modeling deformable objects. Determining spring stiffness parameters for simulation of soft objects with high accuracy still remains a challenge. Allen Van Gelder derived an approximate formula for determining spring stiffness parameters based on strain analysis. Even though the experimental result showed the effectiveness, the method has not been investigated from a quantitative point of view. In this paper we propose a quantitative method for determining spring stiffness parameters. Moreover we propose a method to improve the accuracy by way of introducing torsional spring into the conventional spring mesh model. © 2008 The authors. All rights reserved.

关键词： Stiffness matrix

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A simple, usable and robust solution for pen-based interaction on projection displays

A simple, usable and robust solution for pen-based interacti...

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International Workshop on Pen-Based Learning Technologies, PLT

作者： Giancarlo Iannizzotto Francesco La Rosa VisiLab Computer Vision and Human-Computer Interaction Laboratory Engineering University of Messina Messina Italy

In this paper we describe a pen-based user interface for easy and natural user interaction with a wall projection display. VisualPen is a vision-based system for real-time detection and tracking of a pen that completely replaces mouse and keyboard. The low computational complexity of its algorithms renders it easy to implement with low-cost, low-power embedded hardware, thus allowing portability and integrability. The architecture of the system is described, and experimental results are presented and commented.

关键词： Robustness Displays User interfaces Real time systems Mice Keyboards Computational complexity Rendering (computer graphics) Hardware computer architecture

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NetVisia: Heat map & matrix visualization of dynamic social network statistics & content

NetVisia: Heat map & matrix visualization of dynamic social ...

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2011 IEEE International Conference on Privacy, Security, Risk and Trust, PASSAT 2011 and 2011 IEEE International Conference on Social Computing, SocialCom 2011

作者： Gove, Robert Gramsky, Nick Kirby, Rose Sefer, Emre Sopan, Awalin Dunne, Cody Shneiderman, Ben Taieb-Maimon, Meirav Department of Computer Science United States Human-Computer Interaction Lab University of Maryland College Park MD United States Ben-Gurion University of Negev Beer-Sheva Israel

ISBN: (纸本)9780769545783

Visualizations of static networks in the form of node-link diagrams have evolved rapidly, though researchers are still grappling with how best to show evolution of nodes over time in these diagrams. This paper introduces NetVisia, a social network visualization system designed to support users in exploring temporal evolution in networks by using heat maps to display node attribute changes over time. NetVisia's novel contributions to network visualizations are to (1) cluster nodes in the heat map by similar metric values instead of by topological similarity, and (2) align nodes in the heat map by events. We compare NetVisia to existing systems and describe a formative user evaluation of a NetVisia prototype with four participants that emphasized the need for tooltips and coordinated views. Despite the presence of some usability issues, in 30-40 minutes the user evaluation participants discovered new insights about the data set which had not been discovered using other systems. We discuss implemented improvements to NetVisia, and analyze a co-occurrence network of 228 business intelligence concepts and entities. This analysis confirms the utility of a clustered heat map to discover outlier nodes and time periods. © 2011 IEEE.

关键词： Visualization

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When are personal technologies for children?

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Personal and Ubiquitous Computing 2001年第3期5卷 191-194页

作者： Druin, Allison Inkpen, Kori University of Maryland Human-Computer Interaction Lab and College of Education A.V. Williams Building 3180 College Park MD 20742 United States Simon Fraser University Burnaby BC Canada

This paper will discuss the various issues surrounding personal technologies for children. Three critical questions will be discussed: Why can technology be important for children? What activities can technology suppo... 详细信息

关键词： Groupware

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