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Local Model of Interaction for Haptic Manipulation of Rigid Virtual Worlds

Daniela Constantinescu, Septimiu E. Salcudean, Elizabeth A. Croft
2005 The international journal of robotics research  
' perception of free space in locally cluttered virtual environments.  ...  The local model includes a proxy of the virtual tool that embeds an approximation of its geometry and of its dynamics, and that eliminates force discontinuities at model updates via proxy deformation.  ...  Proxy deformation converts local geometry discontinuities caused by the virtual environment delay into discontinuities in proxy geometry.  ... 
doi:10.1177/0278364905057856 fatcat:hcmr2yjsfrbntpjjq47zvbdqxu

Web-based collaboration in flexible engineering education

Anh-Vu Nguyen, Denis Gillet
2003 ACM SIGGROUP Bulletin  
(iii) awareness in Web-based learning environment, and (iv) evaluation methods and metrics.  ...  The main issues addressed include (i) object-oriented model for collaboration in Web-based learning environment for engineering education (ii) continuity of interaction in flexible engineering education  ...  Users perform their tasks by interacting with different objects in the Web-based environment, which represent components located on servers.  ... 
doi:10.1145/1052829.1052853 fatcat:zqbdgtf5vjax7jsqrecnyj4r4e

ClearSpace: Mixed Reality Virtual Teamrooms [chapter]

Alex Hill, Matthew Bonner, Blair MacIntyre
2011 Lecture Notes in Computer Science  
This prototype is a starting point for exploring solutions to display and presence disparity by leveraging model-based user representations.  ...  We also describe techniques for enforcing consistency between heterogeneous virtual and physical contexts through system-managed awareness.  ...  A semi-transparent trace avatar can also remain at the original location to avoid discontinuities in user awareness.  ... 
doi:10.1007/978-3-642-22024-1_37 fatcat:hwoqcfmuyfg6fk4wuafgoaizq4

Discontinuity meshing for accurate radiosity

D. Lischinski, F. Tampieri, D.P. Greenberg
1992 IEEE Computer Graphics and Applications  
The shape, location, and order of these discontinuities is determined by the geometry of the light sources and obstacles in the environment.  ...  We discuss the problem of accurately computing the illumination of a diffuse polyhedral environment due to an area light source.  ...  Matt Hyatt modeled the Victorian room environment used in the simulation.  ... 
doi:10.1109/38.163622 fatcat:na3mxsc2hvbkxiqhztizgiuhfi

Collaborative Mixed Reality [chapter]

Mark Billinghurst, Hirokazu Kato
1999 Mixed Reality  
An alternative approach is through Mixed Reality (MR), the overlaying of virtual objects on the real world.  ...  Mechanisms that are effective in face-to-face interactions may be awkward if they are replicated in an electronic medium, often making users reluctant to use the new medium.  ...  Seams can be of two types: • Functional Seams: Discontinuities between different functional workspaces, forcing the user to change modes of operation. • Cognitive Seams: Discontinuities between existing  ... 
doi:10.1007/978-3-642-87512-0_15 fatcat:hkberkkehfcojficyayt3kaazi

Early experience with the mediaspace CoMedi [chapter]

J. Coutaz, F. Bérard, E. Carraux, J. Crowley
1999 IFIP Advances in Information and Communication Technology  
minimize visual discontinuities while supporting free movements in a room.  ...  However, low bandwidth communication is a source of undesirable discontinuities in such systems, resulting in a loss of peripheral awareness.  ...  Although a rectangle is drawn in the wide angle view to show the location of the detailed view, the user has to consolidate the visual discontinuity between the two views.  ... 
doi:10.1007/978-0-387-35349-4_4 fatcat:g2ojx25en5hk3poj6zrnlxowky

Analysing cyclist behaviour at cycling facility discontinuities using video data

Matin S. Nabavi Niaki, Nicolas Saunier, Luis F. Miranda-Moreno
2018 Transactions on Transport Sciences  
This study aims to evaluate the challenges faced by cyclists at discontinuities by observing cyclist behaviour at these locations and comparing them to control sites using automated video analysis techniques  ...  Using a set of discontinuity measures proposed in a previous work and applied to Montreal's cycling network, video data was collected from a pole-mounted camera at locations with discontinuity and control  ...  Tracking parameters are tuned through trial and error in this study to reduce over-segmentation where one road user is tracked as several objects, and over-grouping where many road users are grouped into  ... 
doi:10.5507/tots.2018.006 fatcat:yio3robz7jgphjkinxirpblsfu

The Mobile Effect

Drew Hemment
2005 Convergence. The International Journal of Research into New Media Technologies  
neatly punctures the view of the mobile user as autonomous, somehow apart from the environment through which they move, as if sealed from the world by their very mobility.  ...  The sketch highlights the way in which the need to locate and navigate -for others or for oneself -while on the move is a part of the everyday experience of the mobile phone.  ...  local histories through the fabric of the built environment, exploring relationality or embodiment within a location-aware interactive space, and attempts to combine social software with location-based  ... 
doi:10.1177/135485650501100204 fatcat:yo2hpxn4yzfojedajjaacoyjde

A General Framework for Developing Service Robots

L. Enrique Sucar, Eduardo F. Morales
2007 IFAC Proceedings Volumes  
The navigator allows the robot to localize itself and navigate in a dynamic environment, using natural landmarks.  ...  The perception module combines vision, sonar and lasers so that the robot can detect the relevant objects in the environment, including people.  ...  The user can command the robot to go to certain location by: (i) pointing to a location in the map, or (ii) by using the control keys (forward, backward, left, right) based on the view of the environment  ... 
doi:10.3182/20070213-3-cu-2913.00013 fatcat:hk2tdusyqfgfxkldsj646jyrea

CoMedi

Joëlle Coutaz, François Bérard, Eric Carraux, William Astier, James L. Crowley
1999 CHI '99 extended abstracts on Human factors in computer systems - CHI '99  
CoMedi is a mediaspace prototype that uses computer vision to provide new solutions to the problems of visual discontinuity and privacy.  ...  CoMedi includes a robust face tracker based on cooperation of multiple vision techniques, a tele-exploration tool based on a multiresolution fovea, and new privacy filter using eigen-space coding.  ...  The user can move away from the terminal to show, for example, information from the local environment to distant observers.  ... 
doi:10.1145/632724.632726 fatcat:jxkuejuidzguhg2fjmm2aficom

CoMedi

Joëlle Coutaz, François Bérard, Eric Carraux, William Astier, James L. Crowley
1999 CHI '99 extended abstracts on Human factors in computing systems - CHI '99  
CoMedi is a mediaspace prototype that uses computer vision to provide new solutions to the problems of visual discontinuity and privacy.  ...  CoMedi includes a robust face tracker based on cooperation of multiple vision techniques, a tele-exploration tool based on a multiresolution fovea, and new privacy filter using eigen-space coding.  ...  The user can move away from the terminal to show, for example, information from the local environment to distant observers.  ... 
doi:10.1145/632716.632726 dblp:conf/chi/CoutazBCAC99 fatcat:yqxftt5mtfbztjz5xjv25x2pk4

Transformative reality: Augmented reality for visual prostheses

Wen Lik Dennis Lui, Damien Browne, Lindsay Kleeman, Tom Drummond, Wai Ho Li
2011 2011 10th IEEE International Symposium on Mixed and Augmented Reality  
For example, a depth camera allows the detection of empty ground in cluttered environments that is then visually rendered as bionic vision to enable indoor navigation.  ...  Preliminary user trials, where a head mounted display artificially constrains vision to a 25x25 grid of binary dots, suggest that Transformative Reality provides practical and significant improvements  ...  A colour camera is used to detect frontal human faces using the Viola-Jones algorithm [5] . Detected faces are represented using a symbolic avatar.  ... 
doi:10.1109/ismar.2011.6092402 dblp:conf/ismar/LuiBKDL11 fatcat:uugvn5skifhp3cdt6yjl4ispg4

Transformative reality: Augmented reality for visual prostheses

Wen Lik Dennis Lui, Damien Browne, Lindsay Kleeman, Tom Drummond, Wai Ho Li
2011 2011 10th IEEE International Symposium on Mixed and Augmented Reality  
For example, a depth camera allows the detection of empty ground in cluttered environments that is then visually rendered as bionic vision to enable indoor navigation.  ...  Preliminary user trials, where a head mounted display artificially constrains vision to a 25x25 grid of binary dots, suggest that Transformative Reality provides practical and significant improvements  ...  A colour camera is used to detect frontal human faces using the Viola-Jones algorithm [5] . Detected faces are represented using a symbolic avatar.  ... 
doi:10.1109/ismar.2011.6162903 fatcat:ysn2assr65hbvkriupbr2xarbi

Mixed methods for mixed reality: understanding users' avatar activities in virtual worlds

David F. Feldon, Yasmin B. Kafai
2007 Educational technology research and development  
A mixed-methods analysis identified a major user emphasis on avatar appearance and customization that was invariant across user typologies.  ...  Implications for the use of mixed methods in online environments are discussed with regard to three challenges resolved during the study: (1) appropriate reduction of the vast quantity of data, (2) integrated  ...  Three challenges for interpreting data from virtual worlds Collecting data in the virtual environment has the advantage of complete data capture for all interactions among all users through automated user  ... 
doi:10.1007/s11423-007-9081-2 fatcat:rwdcefwe3rarvfj32vs2bc5g5y

Mobility Management and Roaming with Mobile Agents [chapter]

Do Van Thanh, Sverre Steensen, Jan A. Audestad
2000 Lecture Notes in Computer Science  
The concept of ideal user mobility is introduced which can be seen as an extension of these two concepts better suited for the needs of the mobile user.  ...  In this paper we propose that the mobile agent concept can be used in the design and implementation of ideal user mobility.  ...  In addition security restrictions on both sides can restrict the environment that can be accessed through the open channel.  ... 
doi:10.1007/3-540-45494-2_10 fatcat:n2xbu4cdeneqhbtehtkq5rgsse
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