1 / 17

GazeTalk : Metric -driven design

GazeTalk : Metric -driven design. Arne Lykke-Larsen. ALS since 2000, 41 years old Used GazeTalk with head tracking between 2002 and 2004 Gaze communication since 2004 Active university professor Writing papers (12 journal publications since he got ALS)

holleb
Download Presentation

GazeTalk : Metric -driven design

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. GazeTalk: Metric-driven design

  2. Arne Lykke-Larsen • ALS since 2000, 41 years old • Used GazeTalk with head tracking between 2002 and 2004 • Gaze communication since 2004 • Active university professor • Writing papers (12 journal publications since he got ALS) • Uses PC with gaze interaction 4 to 5 hours per day • Use GazeTalk with EMG-switch to supplement gaze 2 to 3 hours per day

  3. High improvement in QOL • Arne Lykke-Larsen testimony: • ”Gaze interaction combined with speech synthesiz means that I can live an almost normal life despite being late stage PALS. That is, going to work every day, communicating with friends and family, giving talks and writing stories about my life to help other people in the same situation”

  4. Advantages of Gaze Communication • Relatively fast typing: + 10 wpm • Easy to learn -From zero to 2.5 hours • No muscle strain - several working hours possible • Can be used at the late stages of ALS • Can be used by some people with Cerebral Palsy (CP) • May give access to a range of normal PC applications • Very active research and product development in this area

  5. Dis-advantages of Gaze Communication • Expensive hardware • Not possible to select small objects • Sensitive to sunlight • Some people have problems with glasses • May take some time to learn

  6. Gazetalk - Designed to support gaze communication - Can be used free of charge • Typing • E-mail • Web-browser • Music and video player • PDF-reader • Integrated multiple languages • Type-to-talk • Synthetic speech

  7. Key metrics for gaze typing • Words per minute: Number of typed characters or spaces)/5/total time (in minutes). • Net_WPM: The number of characters typed/5 / effective time. (Aoki et al, 2006), • Key Strokes per character (KSPC): MacKenzie(2002) • Number of gazes at text field divided by the number of characters typed. Majaranta et al (2004) • Number of deleted characters (Aoki et al, 2006). • Number of remaining errors (Minimum string distance) • Attended keys per character (AKPC).

  8. Learning curve for gaze typing

  9. Special design for gaze typing • Very large buttons • Easy undo and easy delete • Scaleable button sizes • Highly visible feedback on remaining dwelltime • Allow the user to easily adjust the dwelltime • Click sound to confirm selections • Prevent unintended consecutive clicks • Allow skilled users to do consecutive clicks on the same button • Introduce typing systems with continuous navigation (i.e. Dasher)

  10. Preview of next layout

  11. Maximum contrast to support peripheral priming

  12. Continuous navigation

  13. DASHER • Developed by David Mackays group at Cambridge University • 25 WPM after one hour • ”Fast hands-free writing by gaze direction” Nature 418:838 (August 2002)

  14. Center, topfield and Dasher

  15. CPM 30 25 20 15 Top GAZETALK CENTERGAZETALK 10 Dasher 5 0 1 2 3 4 5 6 7 Block Speed

  16. Rate of backspacing TOPFIELD GAZETALKk 0.08 CENTER GAZETALKk Dasher 0.06 0.04 0.02 0 1 2 3 4 5 6 7 Block Errors

  17. COTS eyetracking

More Related