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HP (Hewlett-Packard) Gesture Keyboard manual

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Table of contents for the manual

  • Page 1

    Gesture Keyboard - User centered de sign 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), matr a s, mod ifi e r , syllable, IMEs Indic text input presents a unique challenge in the fiel[...]

  • Page 2

    Gesture Keyboard - User centered design of a unique input device for Indic Scripts Ashish Krishna 1 , Rahul Ajmera 1 Human Factors International 4 th Floor, Che mtex House Hiranandani Garde ns Mumbai – 4 00 076 {ashish.krishna, rahul.ajmera}@hp.com 1 Currently at HP labs Sandesh Hal arnkar an d Prasha nt Pandit HP labs 24, Salarpuri a Arena, Hosu[...]

  • Page 3

    Figure 1: typical com puter se tup with a g esture key board 2.1 Need for a Devnagari input device Computer usa ge in India is almost enti rely in Englis h and is restri cted to the E nglish- speaking, up per and uppe r- middle class peop le. This stands in direct contrast with the demand for communication in Indian languages. Census data for the y[...]

  • Page 4

    Figure 2: Inscript keyboard (with multiple characters on a sing le key) Commercia lly the dema nd for Devnaga ri input has been patche d by the Insc ript key board. This is essential ly a QWERTY keyboa rd with Devnaga ri characters m apped onto the keys. T he minim um num ber of charact ers that are required even rep resenting D evnagari i s 54, ba[...]

  • Page 5

    3.2 Spatial mapping of gestures In order to limit the technological complexity o f recogniti on and ther eby trying to reduce ins tances of er rors, we have mapped t he gestures on the coordinat es of the writi ng space. This means that th e number of e lements t hat needs to be recognized has been reduced. The same gestures m ade in differe nt are[...]

  • Page 6

    3.5 Deleting using the GKB The Devnagari script is very diffe rently from rom an sc ripts because of the conjun cts it forms when Consonant- Consonant-Vowel modifier, Consonant-Vo wel-Vowel com bination happens. So, i n the case of normal ‘backspace’ where 1 unicode is deleted at a time and it b ecomes very irration al to display the left ov er[...]

  • Page 7

    4.1 User study 4.1.1 Objective The objective of this e xplorat ion was to find the ave rage size users take t o write conso nants and m odifiers (mat ras) and to find relat i ons hip between han dwritin g sty l es with di f fere nt pen grip diam eter and tip thic kne ss. 4.1.2 Method Each user was given a Hindi paragraph (76 words) and they had to [...]

  • Page 8

    Figure 6: Pens use d for study (middl e one is the sty lus) 4.1.4.3 Hindi corpus used: The Hindi paragraph used for th is user study was taken from the BBC’s Hindi news portal (http://www.bbc.co.uk/hind i/news/020419_vajpayee_ac.shtml) a nd was modified a bit so that we could get all the nuances of Hindi m atras in the corpus. Figure 7: Hindi Cor[...]

  • Page 9

    Bottom stri p. Since, the data set was very di stributed, we adhere d to the 90 th percentile data so that almost all of the population could be accommodated. Top Strip Size Plot 4.19 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 0 5 10 15 20 25 Participants size in mms sizes in mms 90th percentile data top strip C o re S t ri p S i ze P l o t 4.63 0 1 2 3 4 5 6 0[...]

  • Page 10

    Bottom Strip Size Plot 3 0 1 2 3 4 0 5 10 15 20 25 Participants size in mms sizes in mms 90th percentile data Figure 9: Graphs s howing cluster data for hand writing sa mples (X axis shows the size in mm and Y axis denotes the no of particip ants) 4.1.7 Results The final gesturable keypad sizes, wh ich is analogous to handwriting was 11.82 mm. The [...]

  • Page 11

    5 Conclusions This keyboard has been accepted quite well with the novice users who have ne ve r used Devnagari keyboard before. In our smal l sessions of use r studies they all seem to be satisfied and were able to achieve a speed of 10- 12 syllables per minut e. Also after a dedic ated usage of an hour everyda y for 2-3 days they were able to go u[...]