特集

学生の研究活動報告−国内学会大会・国際会議参加記 29IEEE GCCE 2018 にて研究発表

ciently bright and has a simple background, and (c) thedevice must be hand held or mounted on an arm.

中村優

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Yugo NAKAMURA
情報メディア学科

Because of these reasons, it cannot be said that these
display device operation methods are sufficient.

3年

The authors propose a new remote operation methodfor display devices for solving these problems in this

1. Preface

paper.

I participated in IEEE GCCE 2018 held at the Nara
Royal Hotel from 9th to 12th October 2018 and made a

2.3 Study outline

poster presentation on the theme of “Operation Method

A compact device with acceleration sensors is placedfor Display Screen Using Acceleration Sensors on aon the user’s fingertip to detect the fingertip movement.

Fingertip”.

The proposed system is configured of a compact device with an acceleration system and the display screen

2. Presentation content

to be operated as shown in Fig. 1.

2.1 Abstract
This paper describes a new method of operating display screens. The authors propose a method of operating the display screen by detecting the movement ofacceleration sensors attached to a fingertip.
In experiments, the acceleration of linear movement
and rotary movement in three axial directions was detected, and the screen was operated following thesemovements.
As a result, we verified that this proposal is valid.
Fig. 1

Acceleration sensor on a user fingertip

2.2 Introduction
On some modern display devices, such as digital sig-

The user can perform various display screen opera-

nage and electronic books, the user can operate the dis-tions through linear movement and rotary movement inplay screen.

three axial directions achieved by moving the fingertip

The operation methods include a touch panel on theup/down, left/right, and forward/backward and rotate.

display operated by directly touching it, methods thatThe device is connected with wireless communicationuse cameras and infrared sensors to detect the user’s

assuming the user and display device will be separated.

movements, and methods that use terminals or watch

The evaluation system shown in Fig. 2 was preparedtype wristbands equipped with acceleration sensors.

to evaluate the proposed details. A TWILITE by MON-However, these methods have the following types of

OWIRELESS was used for the acceleration sensors andproblem: (a) the operation range in which the user canwireless module. This device has 3-axis acceleration

directly touch the display screen is limited, (b) the de-sensors and a 2.4 GHz Wi-Fi module. Each data unit

vice must be placed in an environment that is suffi-

has a 16-bit resolution. The 3-axis acceleration values― ７３ ―

can each be obtained at a maximum 10-millisecond interval as the time interval Δt of Formula (1).

Finally, when the screen operation is judged, thecommand corresponding to the result is used to control
the operation target display device screen.

3. Results of using evaluation system
The results of the evaluations conducted by tilting afingertip are given as an example.
Fig. 3 shows the relation of the detected accelerationand time. In the evaluation, the data from the acceleration sensors was retrieved with 0.1 second as the timeinterval Δt of Equation（1）. The first 1 second and lastFig. 2

1 second were a stationary state.

Evaluation system

The acceleration sensors on the fingertip detect the 3-axis acceleration for the x, y, and z axis. The linearmovement and rotary movement are detected from thisacceleration data as explained below.
For the linear movement, distance x is calculated andobtained with Formula（1）. Movement distance x here
is obtained with acceleration αx, detected from the acceleration sensors, which is integrated twice with theFig. 3

minimum time interval Δt. Distance y and z can be obtained in the same manner. Where m and n are integers.

!
"! "# # ! !!$ !!$%

# "%#"#y element and z element data

4. Conclusion
A method of operating the display screen by detect-（1）ing the movement of acceleration sensors attached toon a fingertip is proposed. In the evaluations, the accel-

For the 3-axial direction rotary movement, angle θxeration of linear movement and rotary movement in 3-

was calculated with the following Formula（2）. A θyaxial directions was detected, and the screen was oper-and θz can be obtained in the same manner.

ated following these acceleration. As a result, it was!""&"!$"%!# !!%'

verified that this proposal is valid.
（2）― ７４ ―