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Dialog Design - Gesture & Pen Interfaces, Mobile Devices

Dialog Design - Gesture & Pen Interfaces, Mobile Devices

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Dialog Design - Gesture & Pen Interfaces, Mobile Devices

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  1. Dialog Design - Gesture & Pen Interfaces, Mobile Devices This material has been developed by Georgia Tech HCI faculty, and continues to evolve. Contributors include Gregory Abowd, Jim Foley, Elizabeth Mynatt, Jeff Pierce, Colin Potts, Chris Shaw, John Stasko, Bruce Walker, and Melody Moore Jackson. Comments directed to foley@cc.gatech.edu are encouraged. Permission is granted to use with acknowledgement for non-profit purposes. Last revision: October 2007. CS / Psych 6750

  2. Dialog Styles 1. Command languages 2. WIMP - Window, Icon, Menu, Pointer 3. Direct manipulation 4. Speech/natural language 5. Gesture & pen CS / Psych 6750

  3. Agenda • PDA overview • Pen input styles CS / Psych 6750

  4. How to use a PDA CS / Psych 6750

  5. Personal Digital Asst. (PDA) Apple iPhone Palm Treo Dell / Asus A639 GPS PDA Apple Newton (1993) Blackberry Curve CS / Psych 6750

  6. PDAs • Now ubiquitous • Small displays • Often touch and pen interfaces • Small thumb-based keyboards • Recent Improvements • Wi-Fi, GPS, more memory, better CPU, better OS, BlueTooth CS / Psych 6750

  7. Is it a PDA? Phone? GPS? Camera? Computer? • Line between devices is blurred today • Apple iPhone – phone, MP3 player, PDA, camera • Palm Treo 700w – phone, Windows computer, PDA, camera • Asus MyPal – Windows computer, GPS device CS / Psych 6750

  8. No Shredder… CS / Psych 6750

  9. Input Options • Pen / Stylus is dominant form • Main techniques • Free-form ink • Soft keyboard • Numeric keyboard => text • Stroke recognition - strokes not in the shape of characters • Hand printing / writing recognition • Sometimes have or can connect keyboard CS / Psych 6750

  10. Free-form Ink • Ink is the data, take as is • Human is responsible forunderstanding andinterpretation • Like a sketch pad CS / Psych 6750

  11. Soft Keyboards • Common on PDAs and mobile devices CS / Psych 6750

  12. Soft Keyboard • Presents a small diagram of keyboard • You click on buttons/keys with pen or finger • QWERTY vs. alphabetical • Tradeoffs? • Alternatives? Apple iPhone soft keyboard CS / Psych 6750

  13. Numeric Keypad -T9 • Tegic Communications developed • You press out letters of your word, it matches the most likely word, then gives optional choices • Faster than multiple presses per key • Used in mobile phones • www.tegic.com/t9 CS / Psych 6750

  14. Stroke Recognition - Graffiti • Graffiti - Unistroke alphabet on Palm PDA • What are yourexperienceswith Graffiti? • Graffiti demo: • mms://199.77.128.107/pub/hcirep/demos/DEMO-palm.wmv CS / Psych 6750

  15. Stroke Recognition - Cirrin • Developed by Jen Mankoff (GT -> Berkeley CS Faculty) • Word-level unistroke technique • UIST ‘98 paper • Use stylus to go from one letterto the next -> CS / Psych 6750

  16. Hand Printing & Hand Writing Recognition • Recognizing letters and numbers and special symbols • Lots of commercial systems • English, kanji, etc. • Not perfect, but people aren’t either! • People - 96% handprinted single characters • Computer - >97% is really good • OCR (Optical Character Recognition) CS / Psych 6750

  17. Recognition Issues • Off-line vs. On-line • Off-line: After all writing is done, speed not an issue, only quality. • Work with either a bit map or vector sequence • On-line: Must respond in real-time - but have richer set of features - acceleration, velocity, pressure • Use best-guess pattern matching, including digram, trigram probabilities and word lists to remove ambiguity • 1 I l CS / Psych 6750

  18. More Issues • Boxed vs. Free-Form input • Sometimes encounter boxes on forms • Printed vs. Cursive • Cursive is much more difficult to impossible • Letters vs. Words • Cursive is easier to do in words vs individual letters, as words create more context CS / Psych 6750

  19. Pen Gesture Commands • Might mean delete • Insert • Paragraph Define a series of (hopefully) simple drawing gesturesthat mean different commands in a system CS / Psych 6750

  20. Pen Use Modes • Often, want a mix of free-form drawing and special commands • How does user switch modes? • Mode icon on screen • Button on pen • Button on device CS / Psych 6750

  21. Error Correction • Having to correct errors can slow input tremendously • Strategies • Erase and try again • When uncertain system shows list of best guesses • ... CS / Psych 6750

  22. A Different Application • Signature verification • But not with a mouse :) CS / Psych 6750

  23. Multi-touch interfaces • Apple iPhone Capacitive touchscreen: http://www.apple.com/iphone/features/index.html#touch Gestures: flick, tap, pinch, un-pinch http://www.apple.com/iphone/features/index.html#map CS / Psych 6750

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