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Gesture Keyboard - User centered design of a unique input device
for Indic Scripts
Ashish Krishna
1
, Rahul Ajmera
1
, Sandesh Halarnkar, Prashant Pandit
HP Laboratories India
HPL-2005-56
March 18, 2005*
devnagari text
entry, gesture
keyboard (GKB),
matras, modifier,
syllable, IMEs
Indic text input presents a unique challenge in the field of keyboard
design because of the number of standalone characters, conjuncts, matras,
and symbols. It poses a huge challenge to the HCI practitioners to
accommodate the humongous array of Devnagari characters in a
keyboard. Solutions for input in Devnagari scripts using a physical
keyboard have been around for a while but none of them have emerged as
a standard mechanism due to several usability related concerns. In this
paper we have described the design of a new gesture based keyboard,
which has a dual input mode 1. Gesturing 2. Tapping. The "gesture
keyboard" concept is based on partial hand writing recognition as well as
touch-typing paradigms. Conceptually, it is a stylus sensitive keypad tha
t
supports tapping for getting the base consonants and some symbols,
while it also recognizes handwritten matras as per handwriting
recognition methods. This paper also reports the findings of the use
r
study, which was carried out to find the optimum sizes of the keys and
layouts.
* Internal Accession Date Only
HCI International 2005, 22-27 July 2005, Las Vegas, Nevada, USA
1
Human Factors International, 4
th
Floor, Chemtex House, Hiranandani Gardens, Mumbai – 400 076, India
Approved for External Publication
© Copyright 2005 Hewlett-Packard Development Company, L.P.
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Inhaltsverzeichnis

Seite 1

Gesture Keyboard - User centered design of a unique input device for Indic Scripts♦ Ashish Kris

Seite 2 - Scripts

Bottom Strip Size Plot3012340 5 10 15 20 25Participantssize in mms sizes in mms90th percentile data Figure 9: Graphs showing cluster data for handwri

Seite 3

5 Conclusions This keyboard has been accepted quite well with the novice users who have never used Devnagari keyboard before. In our small sessions

Seite 4 - 3 Introduction to the GKB

Gesture Keyboard - User centered design of a unique input device for Indic Scripts Ashish Krishna1, Rahul Ajmera1 Human Factors International 4th Fl

Seite 5

Figure 1: typical computer setup with a gesture keyboard 2.1 Need for a Devnagari input device Computer usage in India is almost entirely in Engl

Seite 6

Figure 2: Inscript keyboard (with multiple characters on a single key) Commercially the demand for Devnagari input has been patched by the Inscript k

Seite 7

3.2 Spatial mapping of gestures In order to limit the technological complexity of recognition and thereby trying to reduce instances of errors, we

Seite 8

3.5 Deleting using the GKB The Devnagari script is very differently from roman scripts because of the conjuncts it forms when Consonant-Consonant-Vo

Seite 9

4.1 User study 4.1.1 Objective The objective of this exploration was to find the average size users take to write consonants and modifiers (matr

Seite 10 - 4.1.7 Results

Figure 6: Pens used for study (middle one is the stylus) 4.1.4.3 Hindi corpus used: The Hindi paragraph used for this user study was taken from the

Seite 11 - 8 References

Bottom strip. Since, the dataset was very distributed, we adhered to the 90th percentile data so that almost all of the population could be accommodat

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