Instruction/ maintenance manual of the product Gesture Keyboard HP (Hewlett-Packard)
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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 1.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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