スマートフォンにおける背面タップと傾け動作を用いた文字入力手法の検討

抄録

This paper examined character input using tilting motion and back tap for a smartphone.

Character input in smartphones has a problem such as erroneous input and large size input screen. To solve these problems, a multi-choice input method with a low degree of freedom had been designed to be able to input to sixty-four characters by flicking four buttons in two directions up and down and repeating it twice.

Besides, it was possible to input not only by touch, proposing four alternatives and a method of dividing these alternatives into two. In this research, the aim is to develop a multi-choice input interface with a low degree of freedom, in which four actions are taken by moving corners of the device closer and far from the body, and eight actions are performed by tapping the back of the device before performing these actions.

The three-axis acceleration sensor of smartphone was used to determine the movement. For the tilt movement, it was possible to determine using the z-axis or y-axis and the phase of the x-axis and y-axis. For the back tap, discrimination could be performed by the z-axis. Accordingly, all movements could be determined the average was 90% more.