Pattern Recognition
A survey of thresholding techniques
Computer Vision, Graphics, and Image Processing
Processing of engineering line drawings for automatic input to CAD
Pattern Recognition
An analysis of histogram-based thresholding algorithms
CVGIP: Graphical Models and Image Processing
Recovering high dynamic range radiance maps from photographs
Proceedings of the 24th annual conference on Computer graphics and interactive techniques
Cyberguide: a mobile context-aware tour guide
Wireless Networks - Special issue: mobile computing and networking: selected papers from MobiCom '96
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Sotto voce: exploring the interplay of conversation and mobile audio spaces
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Interaction in a collaborative augmented reality environment
CHI '02 Extended Abstracts on Human Factors in Computing Systems
Camping in the digital wilderness: tents and flashlights as interfaces to virtual worlds
CHI '02 Extended Abstracts on Human Factors in Computing Systems
Proceedings of the 2001 conference on Virtual reality, archeology, and cultural heritage
Lessons from the lighthouse: collaboration in a shared mixed reality system
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
The FindIT Flashlight: Responsive Tagging Based on Optically Triggered Microprocessor Wakeup
UbiComp '02 Proceedings of the 4th international conference on Ubiquitous Computing
Estimation of Illumination Distribution Using a Specular Sphere
ICPR '00 Proceedings of the International Conference on Pattern Recognition - Volume 3
Real-time Estimation of Light Source Environment for Photorealistic Augmented Reality
ICPR '04 Proceedings of the Pattern Recognition, 17th International Conference on (ICPR'04) Volume 2 - Volume 02
Interactive Tabletop Exhibits in Museums and Galleries
IEEE Computer Graphics and Applications
Guest Editors' Introduction: Interacting with Digital Tabletops
IEEE Computer Graphics and Applications
The augurscope: refining its design
Presence: Teleoperators and Virtual Environments - Special issue: Virtual heritage
Detection of moving cast shadows for object segmentation
IEEE Transactions on Multimedia
IEEE Transactions on Pattern Analysis and Machine Intelligence
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Flashlights are cheap, robust and fun. Most people from adults to children of an early age are familiar with flashlights and can use them to search for, select and illuminate objects and features of interest. Flashlights are available in many shapes, sizes, weights and mountings. Flashlights are particularly appropriate to situations where visitors explore dark places such as the caves, tunnels, cellars and dungeons that can be found in museums, theme parks and other visitor attractions. We describe techniques by which descriptions of flashlight projections are recovered from the image sequence supplied by a fixed camera monitoring a target surface. These representations are used to locate and recognise individual flashlights and support a multi-user interface technology triggering audiovisual events in response to users' actions and explorations. The technology has been developed in the context of, and deployed within, a set of seven interactive exhibits of varying complexity.