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Towards Accessible Touch Interfaces
 

Towards Accessible Touch Interfaces

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    Towards Accessible Touch Interfaces Towards Accessible Touch Interfaces Presentation Transcript

    • Towards Accessible Touch Interfaces Tiago Guerreiro Hugo Nicolau Joaquim Jorge Daniel Gonçalves
    • Mobile evolution …
    • Leading to …Touch Interfaces
    • pleasant
    • Tactile feedbackloss of tactile feedback
    • Loss of physical stability
    • hard to select targets
    • it occurs to everyone
    • … and motor impaired
    • require less strength
    • Adapt to users’ needs
    • Provide the knowledge tobuild better touch interfaces
    • We performed …
    • Tested several … Interaction Techniques
    • Screen areas … … corners
    • Screen areas … … edges
    • … and target sizes 7 mm 12 mm 17 mm
    • Tapping
    • Crossing
    • Exiting
    • Gesturing
    • 15 participants 28-64 years old C4-C7 lesion level 6 left-handednever used touchscreens
    • Results
    • Error Rate X
    • Precision
    • Movement Error
    • Movement Time t0 tn
    • Tapping
    • Target Size 50% 40%Error Rate (%) 30% 20% 10% 0% 7mm 12mm 17mm Target sizes (milimeters)
    • Corners and Edges precision
    • Vertical error rate 7mm 12mm 17mm 45% 28% 27% 39% 28% 24% 43% 19% 12%
    • Distance error rate 17mm 28% 20% 12% 28% 11% 20% 12% 11% 6%
    • Crossing
    • Target Size 50% 40%Error Rate (%) 30% 20% 10% 0% 7mm 12mm 17mm Target size (milimeters)
    • Exiting
    • Target Size 80% 70% 60%Error Rate (%) 50% 40% 30% 20% 10% 0% 7mm 12mm 17mm Target size (milimeters)
    • Gesturing
    • Edges 60 50Movement Error (pixels) 40 30 20 10 0 Center Edge Gesture
    • Movement Error (pixels) 0 50 150 200 250 100 NW NE SW SE SLeft Directions N WUpper S E WGesture Direction SRight NRight EUpper NLeft WBottom EBottom
    • MixingAllTechniques
    • All Techniques 80% 70% 60%Error Rate (%) 50% 40% 30% 20% 10% 0% 7mm 12mm 17mm Target Size (milimeters) Exiting Gestures Tapping Crossing
    • Interact with edge support
    • Interact with edge support 22% 36%
    • Acquiring edge targets
    • Acquiring edge targets
    • Edge or Middle
    • Edge or Middle
    • Interacting mid-screen
    • Interacting mid-screen50%45%40%35%30%25%20%15%10%5%0% 7mm 12mm 17mm Crossing GesturesM4Way Tapping Middle
    • Interacting mid-screen50%45%40%35%30%25%20%15%10%5%0% 7mm 12mm 17mm Crossing GesturesM4Way Tapping Middle
    • 543210 Exiting Tapping Crossing Gesturing
    • Conclusions
    • What is the best size foreach interaction technique?
    • 12 mm
    • However, error rates are still … High
    • What is the best screenarea for each interactiontechnique?
    • Regarding target position …Support
    • What is the best interactiontechnique for motor-impaired people?
    • What is the best interactiontechnique for each screenarea?
    • What is the best technique-size-area combination?
    • Future Work Explore target size for the target population Differences between able-bodied and tetraplegics
    • The EndTiago Guerreirotjvg@vimmi.inesc-id.pt