Two-step Text Entry for Touchscreen Mobile Devices

Korištenje virtualne tipkovnice pri interakciji s mobilnim napravama sa zaslonom osjetljivim na dodir jedan od najčešćih interakcija čovjeka s računalom. Međutim, problem unosa teksta na standardnim tipkovnicama je broj grešaka koje korisnik unese. Jedan od tehnika za rješavanje problema je ograničavanje broja tipki što uzrokuje unošenje znakova u dva koraka. Tipkovnica je oblikovana za dvokoračni unos čiji se raspored slova te tehnika unosa temelji na učestalosti pojave bigrama u hrvatskom jeziku. Dvokoračni unos se usporedio s QWERTY tipkovnicom. Prilikom vrednovanja korišten je standardizirani skup fraza u hrvatskom jeziku. Vrednovanje je provedeno za različite stavove korisnika i veličine zaslona mobilnih naprava.Using virtual keyboard on touch screen mobile devices is one of the most common human computer interactions. However, the problem with the text entry keyboards is the number of mistakes the users make. One way of solving this problem is to limit number of keys what brings us to two-step text entry. The keyboard is created for two-step text entry. The letters on the keyboard and the way of text entry is based on the frequency of bigram in Croatian language. Two-step entry is compared to QWERTY keyboard. The evaluation was based on a set of standard phrases in Croatian language.¬¬ Variables in evaluation are size of touch screen on mobile devices and body position