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Text input PowerPoint Presentation

Text input

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Text input

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Presentation Transcript

  1. Text input CMPT 381

  2. Outline • What is important when designing text input? • Modeling text • Measuring text-entry performance • Type-ahead • Keyboard layouts • Chording keyboards • On-screen keyboards

  3. Important factors in text entry

  4. Modeling text • What is this sentence?

  5. Modeling text

  6. Modeling text: letter frequencies

  7. Modeling text: letter frequencies

  8. Modeling text: bigrams

  9. Modeling text: prediction

  10. Modeling text: tries

  11. Measuring performance • Speed to type a given phrase • Number of errors • The quick brown fox jumped over the lazy dog • The quuick brown fox jumped over the lazy dog • The queickfvorwomnvosjoimeodcoeverm the oslaxldodg • Edit distance

  12. Type-ahead

  13. Keyboard layouts

  14. Chording

  15. Chording

  16. On-screen keyboards

  17. Metropolis

  18. EdgeWrite

  19. Quikwriting

  20. Shark