Applying Mobile Device Soft Keyboards to Collaborative Multitouch Tabletop Displays

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Presentation slides from ACM ITS 2011 on our full paper on digital tabletop text entry.

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Applying Mobile Device Soft Keyboards to Collaborative Multitouch Tabletop Displays

  1. 1. APPLYING MOBILE DEVICE SOFT KEYBOARD TO COLLABORATIVEMULTITOUCH TABLETOP DISPLAYS : DESIGN AND EVALUATION SungAhn Ko, KyungTae Kim, Tejas Kulkarni and Niklas Elmqvist Purdue University, USA
  2. 2. isn’t it too big?
  3. 3. Do you see what I see… I’m a tabletop which is hidden under keyboards…
  4. 4. RELATED WORKLayouts – Quikwriting( Perline et al. ’98), Cirrin (Mankoff et al. ’98)Performance Measure – In search of effective text input interfaces for off the desktop computing ( Zhai et al. ’05) – Evaluation of Soft Keyboard ( Soukoreff and MacKenzie , ‘95, ’99)Tabletop Text Entry – Examination of text-entry methods for tabletop displays ( Hinrichs et al. ‘07) – SLAP widgets ( Weiss et al. ‘09) – Typing on flat glass : examining ten-finger expert, typing patterns on touch surfaces( Findlater et al. ‘11)
  5. 5. DESIGN CRITERIA Minimize Space Minimize Occlusion Maximize Robustness
  6. 6. SOFT KEYBOARD
  7. 7. RADIAL KEYBOARD
  8. 8. PINPOINT KEYBOARD
  9. 9. INTERACTING WITHPINPOINT KEYBOARD
  10. 10. INTERACTING WITHPINPOINT KEYBOARD
  11. 11. INITIAL USER STUDY• 15 Participants (11 males, 4 females)• Age : 21 – 29 ( avg. 24.9, median 25)• Normal or corrected-to-normal vision• Experienced, not professional• Duration : 1 hour
  12. 12. SETUP
  13. 13. TASKSApparatus : 1.4m x 0.9m (81”) FTIR multitouch tabletopdisplay(1280x800), Microsoft WindowsTask 1 : Users are not allowed to correct errorsTask 2 : Users are force to correct errors.Phrase : Standard Phrase*Keyboards : Soft, Radial and PinpointSize : Small, Medium and Large15 participants x 3 keyboard types x 3 size allocations x2 tasks x 1 rep = 270 total trials * Proposed by MacKenzie and Soukoreff CHI ’03
  14. 14. RESULTT1 T2
  15. 15. T1
  16. 16. FOLLOW-UP STUDYComparison between Pinpoint Keyboard and Soft Keyboard, SHIFT techniqueKeyboards : Soft, Pinpoint Soft with ShiftTask : Participants can make mistakes and correct theme as they see it15 participants x 3 keyboard types x 12 repetitions = 540 total trials
  17. 17. RESULTS
  18. 18. DESIGN IMPLICATIONSStandard QWERTY keyboards are the fastest in general.Radial Keyboards may not transfer well to tabletops.Pinpoint was promising, but still slower than QWERTY.The Shift technique did not have a significant impact.
  19. 19. GENERALIZING RESULTSRadial and pinpoint typing did not outperform soft keyboards. But!Hybrid of pinpoint and soft keyboard is possible.Occlusion reduction technique does not yield lower error rate,especially when users have to type fast.
  20. 20. GENERALIZING RESULTSRadial and pinpoint typing did not outperform soft keyboards. But!Hybrid of pinpoint and soft keyboard is possible.Occlusion reduction technique does not yield lower error rate,especially when users have to type fast.
  21. 21. GENERALIZING RESULTSRadial and pinpoint typing did not outperform soft keyboards. But!Hybrid of pinpoint and soft keyboard is possible.Occlusion reduction technique does not yield lower error rate,especially when users have to type fast.
  22. 22. CONCLUSIONEvaluated popular soft keyboard-based text entrymethod with two user studiesQWERTY soft keyboards are significantly faster.A lot of future work needs to be done. Such as,applying dictionary-based methods, click-to-tagannotation, and possible speech input.Additional applications of pinpointing.
  23. 23. QUESTIONS elm@purdue.edu kimk@purdue.eduhttp://engineering.purdue.edu/pivot

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