HoliBraille: Multipoint Vibrotactile Feedback on Mobile Devices

H OLIB RAILLE

HUGO NICOLAUKYLE MONTAGUE, TIAGO GUERREIRO

ANDRÉ RODRIGUES, VICKI L. HANSON

motivation :: non-visual input

motivation :: braille input

motivation :: braille output

problem :: braille output

contribution :: holibraille

application :: deaf-blind

application :: education

application :: typing feedback

application :: privacy & security

holibraille :: design & hardware

holibraille :: localized feedback

holibraille :: localized feedback

evaluation :: character discrimination

11 blind participants

evaluation :: procedure

1. Audio signal

2. Delay (2 seconds)

3. Random braille character (from 26 letters)

4. Answer

5. Monitor register answer

26 le

tte

rs x

2 b

locks

results :: fingers vs. accuracy

A B F L

N Y Z

100

%

100

%

96% 96%

48% 39% 30%

results :: 61% - 1 finger errors

P Fomission

S Tinsertion

results :: finger-dependent errors

35%

18%

discussion :: overall accuracy

10 min. practice

overall - 73%

< 4 dots – 89%

discussion :: feedback design

braille21.com

HUGO NICOLAUpaper and slides @ http://web.ist.utl.pt/hugo.nicolau