masui - An Efcient Text Input Method for Pen-based...

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An Efficient Text Input Method for Pen-based Computers Toshiyuki Masui Sony Computer Science Laboratory Inc. 3-14-13 Higashi-Gotanda Shinagawa, Tokyo 141-0022, Japan +81-3-5448-4380 [email protected] ABSTRACT Pen-based computing has not yet taken off, partly because of the lack of fast and easy text input methods. The situation is even worse for people using East Asian languages, where thousands of characters are used and handwriting recogni- tion is extremely difficult. In this paper, we propose a new fast text input method for pen-based computers, where text is not composed by entering characters one by one, but by selecting words from a menu of candidates created by filter- ing the dictionary and predicting from context. Using our approach, users can enter Japanese text more than twice as fast as recognition-based and other existing text input meth- ods. User studies and detailed analysis of the method are also given. KEYWORDS: Input devices, Pen-based input, Predictive interface,Hand-held devices, Internationalinterfaces, POBox INTRODUCTION Althoughavariety ofpen-based computersare availablethese days, they are not as widely used as keyboard-based comput- ers, partly because entering text is much harder on pen-based machines. Traditionally, handwriting recognition techniques and the soft keyboard (virtual keyboard displayed on the tablet of a pen computer) used to be the main techniques for entering characters on pen-based computers, although other techniques have also been proposed[4][6]. However, using any of these techniques takes much longer to enter text than with a standard keyboard. The situation is worse for East Asian languages such as Chi- nese, Japanese, etc. These, unlike European languages, have thousands of character faces. Even with a keyboard, it is not easy to enter a character. A variety of techniques for en- tering text into computer have been investigated. The most widely-used Japanese input technique is “Roman-Kanji con- version” (RKC), in which a user specifies the pronunciation of a word with an ASCII keyboard, and the system shows the user a word with the specified pronunciation 1 . If the word 1 Japanese characters consist of two character sets. Kanji characters, Published in: Proceedings of the ACM Conference on Human Factors in Computing Systems (CHI’98) (April 1998), ACM press, pp. 328–335. was not the one that the user intended to use, the user types a “next candidate key” until the correct word appears as the candidate. On almost all the pen-based computers available in Japan, either RKC or handwriting recognition is supported. Text input is slow and tiring using either of the techniques, for the following reasons. Specifying the pronunciation of every input word using a soft keyboard takes a lot of time, and the user must convert the pronunciation to the desired Kanji strings with extra keystrokes. Handwriting recognition has more problems. First, the recognizer has to distinguish be- tween thousands of characters, often making errors. Many of
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This note was uploaded on 06/13/2011 for the course CAP 6938 taught by Professor Staff during the Spring '08 term at University of Central Florida.

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masui - An Efcient Text Input Method for Pen-based...

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