Computer Laboratory

Technical reports

Using camera-phones to interact with context-aware mobile services

Eleanor Toye, Anil Madhavapeddy, Richard Sharp, David Scott, Alan Blackwell, Eben Upton

December 2004, 23 pages


We describe an interaction technique for controlling site-specific mobile services using commercially available camera-phones, public information displays and visual tags. We report results from an experimental study validating this technique in terms of pointing speed and accuracy. Our results show that even novices can use camera-phones to “point-and-click” on visual tags quickly and accurately. We have built a publicly available client/server software framework for rapid development of applications that exploit our interaction technique. We describe two prototype applications that were implemented using this framework and present findings from user-experience studies based on these applications.

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BibTeX record

  author =	 {Toye, Eleanor and Madhavapeddy, Anil and Sharp, Richard and
          	  Scott, David and Blackwell, Alan and Upton, Eben},
  title = 	 {{Using camera-phones to interact with context-aware mobile
  year = 	 2004,
  month = 	 dec,
  url = 	 {},
  institution =  {University of Cambridge, Computer Laboratory},
  number = 	 {UCAM-CL-TR-609}