Towards Accessible Touch Interfaces

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  • 1. Towards Accessible Touch Interfaces Tiago Guerreiro Hugo Nicolau Joaquim Jorge Daniel Gonçalves
  • 2. Mobile evolution …
  • 3. Leading to …Touch Interfaces
  • 4. pleasant
  • 5. Tactile feedbackloss of tactile feedback
  • 6. Loss of physical stability
  • 7. hard to select targets
  • 8. it occurs to everyone
  • 9. … and motor impaired
  • 10. require less strength
  • 11. Adapt to users’ needs
  • 12. Provide the knowledge tobuild better touch interfaces
  • 13. We performed …
  • 14. Tested several … Interaction Techniques
  • 15. Screen areas … … corners
  • 16. Screen areas … … edges
  • 17. … and target sizes 7 mm 12 mm 17 mm
  • 18. Tapping
  • 19. Crossing
  • 20. Exiting
  • 21. Gesturing
  • 22. 15 participants 28-64 years old C4-C7 lesion level 6 left-handednever used touchscreens
  • 23. Results
  • 24. Error Rate X
  • 25. Precision
  • 26. Movement Error
  • 27. Movement Time t0 tn
  • 28. Tapping
  • 29. Target Size 50% 40%Error Rate (%) 30% 20% 10% 0% 7mm 12mm 17mm Target sizes (milimeters)
  • 30. Corners and Edges precision
  • 31. Vertical error rate 7mm 12mm 17mm 45% 28% 27% 39% 28% 24% 43% 19% 12%
  • 32. Distance error rate 17mm 28% 20% 12% 28% 11% 20% 12% 11% 6%
  • 33. Crossing
  • 34. Target Size 50% 40%Error Rate (%) 30% 20% 10% 0% 7mm 12mm 17mm Target size (milimeters)
  • 35. Exiting
  • 36. Target Size 80% 70% 60%Error Rate (%) 50% 40% 30% 20% 10% 0% 7mm 12mm 17mm Target size (milimeters)
  • 37. Gesturing
  • 38. Edges 60 50Movement Error (pixels) 40 30 20 10 0 Center Edge Gesture
  • 39. 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
  • 40. MixingAllTechniques
  • 41. All Techniques 80% 70% 60%Error Rate (%) 50% 40% 30% 20% 10% 0% 7mm 12mm 17mm Target Size (milimeters) Exiting Gestures Tapping Crossing
  • 42. Interact with edge support
  • 43. Interact with edge support 22% 36%
  • 44. Acquiring edge targets
  • 45. Acquiring edge targets
  • 46. Edge or Middle
  • 47. Edge or Middle
  • 48. Interacting mid-screen
  • 49. Interacting mid-screen50%45%40%35%30%25%20%15%10%5%0% 7mm 12mm 17mm Crossing GesturesM4Way Tapping Middle
  • 50. Interacting mid-screen50%45%40%35%30%25%20%15%10%5%0% 7mm 12mm 17mm Crossing GesturesM4Way Tapping Middle
  • 51. 543210 Exiting Tapping Crossing Gesturing
  • 52. Conclusions
  • 53. What is the best size foreach interaction technique?
  • 54. 12 mm
  • 55. However, error rates are still … High
  • 56. What is the best screenarea for each interactiontechnique?
  • 57. Regarding target position …Support
  • 58. What is the best interactiontechnique for motor-impaired people?
  • 59. What is the best interactiontechnique for each screenarea?
  • 60. What is the best technique-size-area combination?
  • 61. Future Work Explore target size for the target population Differences between able-bodied and tetraplegics
  • 62. The EndTiago Guerreirotjvg@vimmi.inesc-id.pt