2. 1 LED Nakata, et al LED [2] LED LED [3] LED LED LED LED LED 2 3 3 LED LED 3 LED 3. 3.1 [4] LED [5] [6] LED 2 LED LED 1 2 LED 1 2 1 LED LED 2 LED LE

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1,a) 2,b) LED LED LED Customizing Illumination Patterns through Spotting with Smartphone Nagase Daigo 1,a) Fujinami Kaori 2,b) Abstract: Illumination is often used to make atmosphere about various events better, and can be various design by place which is decorated with LEDs. However, LEDs for illumination on the market have few patterns about blinking. In this paper, we suggested input method which allows users to input various illumination patterns intuitively. Also, we experimented the customization method using a prototype system. We define the difference between existing LED devices and proposed system to consider about quality of proposed method from the result. A user study showed that the customization by first-spotting-next-setting was easy for beginners. 1. [1] LED 1 Department of Computer and Information Sciences, Tokyo University of Agriculture and Technolog 2 Department of Computer and Information Sciences, Tokyo University of Agriculture and Technology a) d.nagase0220@gmail.com b) fujinami@cc.tuat.ac.jp LED 1 2 3 4 5 6 Processing Society of Japan 755

2. 1 LED Nakata, et al LED [2] LED LED [3] LED LED LED LED LED 2 3 3 LED LED 3 LED 3. 3.1 [4] LED [5] [6] LED 2 LED LED 1 2 LED 1 2 1 LED LED 2 LED LED 3.2 LED LED LED Processing Society of Japan 756

3 (i) (a (b) (c) (d) ID ID 2 [7][8] ID [9] 2 1 LED LED LED 2 2 LED LED [10] LED LED [13] LED 3.3 LED LED LED 3 LED ( 1 ) ( 2 ) ( 3 ) 4 (a) (b) (c) (d) 4 4 Android 3 3 i 4 (a) 3 a RGB 3 8 1 (b) 3(b) (c) 3(c) LED (d) 3(d) HIGH LOW HIGH LOW HIGH LOW 4. 4.1 3 LED Processing Society of Japan 757

4 6 LED 5 Android Bluetooth Arduino Arduino LED LED 2 Arduino 2 Arduino 4 LED(NeoPixel Diffused 8mm[14]) Arduino(UNO)[15] Arduino(MEGA) Bluetooth Bluetooth Mate 4.2 LED LED 4.2.1 Arduino LED [10][11] Arduino Arduino LED 5 Arduino Arduino 0 5V 10bit AD 6 2 6 55 0.2695V 7 LED Arudino LED1 4.2.2 LED [10] LED LED LED LED ON/OFF Arduino ON/OFF 7 0.5 0.5 1 Processing Society of Japan 758

情報処理学会 インタラクション 図 9 (a) プロトタイプシステムと b 評価実験風景 図 8 様々な状況下で発生する LED のセンサ値 れにより LED は入力状態と出力状態を高速に変化させた 場合でも どちらの役割も失わずに機能できる 4.2.3 環境光の影響調査 提案する入力方法では光を使用しているため 環境光に よる影響も考慮しなければならない イルミネーションの 装飾を行う際に 想定できる環境光について 屋外 天候 晴れ 屋内かつ日向 屋内かつ日陰 蛍光灯の近くの 4 つ を想定し これらの状況下で発生する LED の起電力を調 査した その結果を図 8 に示す 図 8 を見ると 太陽光が関係している屋外と日向では高 い値を出力し 屋内環境では比較的低い値であった そし て フラッシュライトをかざしたときのセンサ値はその中 間に位置していることがわかる ゆえに 閾値の範囲に下 図 10 入力時間と SUS の合計得点の 2 軸グラフ 限だけではなく上限を定めることによって 環境光による 影響の除外が可能であると推測される 定 が 4 人 設定 選択 が均等になるよう 4 人ごとに分 以上をふまえて 本研究で定める閾値はセンサ値 25 以 けた 入力方法を扱ってもらった後 被験者らに対してア 上 70 以下 電圧値 0.1225 0.343V とする しかしなが ンケートの記入とインタビューを行った アンケートには ら この閾値はスマートフォンのデバイスに依存するため ユーザビリティを簡易的に数値化できる System Usablity 汎用性を高めるためにはこの制限を除去する必要がある Scale(SUS)[16] を用いた あらかじめ 16 個の LED を高さ 5. 評価実験 5.1 実験概要 40cm のクリスマスツリーに飾り付けておき 被験者は図 9 に示すようにパターンの設定を行った また 実験風景 も図 9 に示す 3.1 節で提案した二つの入力方法適性を理解するために プロトタイプシステムを用いて イルミネーションの装 5.2 結果および考察 飾を行ったことがほとんどない被験者 男性 6 人 女性 2 それぞれの入力方法を用いたときの時間と SUS の合計 人 により 評価実験を行った まず被験者らには 実際 得点を図 10 に示す 8 人中 7 人のユーザが 選択 設定 に LED に対してフラッシュライトをかざしてもらい 選 の方法を用いた場合 設定 選択 の方法を用いた場合 択方法に慣れた後で 全被験者共通の特定のイルミネー より入力時間が短くなった 一方 SUS の得点には大きな ションパターンを提案した二つの入力方法 すなわち 選 差が見られなかった それぞれの平均点を算出した結果 択 設定 と 設定 選択 を搭載したシステムで入力し 選択 設定 の方法が 79.4 であり 設定 選択 の方法 てもらった このとき 入力方法が直感的であればその入 が 77.2 であった どちらの方法についても SUS の平均点 力時間も短いものであると考えたため 評価指標として入 である 68[17] を超えていたため 最低限のユーザビリティ 力時間を計測した また 被験者らが用いた入力方法の順 が確保できたと考えられる 以上のことから 選択 と 番の影響を回避するために 最初に扱う方法が 選択 設 設定 の二つの操作は複雑ではないことが推測される し Processing Society of Japan 759

10 A C D SUS 6 LED LED 5 2 LED 6. LED LED 16 LED LED [1]? 2014( I) pp 425-426 (2014) [2] Mami Nakata et al Design and Implementation of a Ubiquitous OpticalDevice Controlled with a Projector Proc of lnternational Conferenceon Adwnces in Mobile Cemputing and Multimedia (MoMM2008) pp 130 135(2008) [3] LED. EC, (26) pp 65-70 (2009) [4] 26 http: //www.soumu.go.jp/johotsusintokei/whitepaper/ ja/h26/html/nc253110.html(2015 12 20 ) [5] iphoneos Arduino (13) pp 16-23 (2012) [6] Meet hue ja-jp http://www2.meethue.com/ ja-jp/(2015 12 20 ) [7] Naoya Isoyama et al A method to control LED blinking for position detection of devices on conductive clothes Proc of the 9th International Conference on Advances in Mobile Computing and Multimedia(MoMM 11) pp 123-130 (2013) [8] u-photo :. OS, [ ] 96 pp 65-72 (2004) [9]. UBI, [ ] 2015-UBI-47 (2015) [10] LED. USN, 110(50) pp 5-10 (2010) [11]. CS, 106(450) pp 31-35 (2007) [12] Shirakawa Yasutomo et al JR East Contact-less IC Card Automatic Fare Collection System Suica IEICE transactions on information and systems E86-D(10) pp 2070-2076 2003 [13] Junichi Akita et al Interactive block device system with pattern drawing capability on matrix leds Proc of The ACM SIGCHI Conference on Human Factors in Computing Systems (CHI2012) pp 1059-1062(2012) [14] Adafruit Industries, Unique Fun DIY electronics and kits https://www.adafruit.com/(2015 12 20 ) [15] Arduino HomePage http://www.arduino.cc/(2015 12 20 ) [16] John. Brooke SUS - A quick and dirty usability scale, Usability Evaluation in Industry pp 189-194 (1996) [17] System Usability Scale (SUS) Usability.gov, http://www.usability.gov/how-to-and-tools/ methods/system-usability-scale.html(2015 12 20 ) Processing Society of Japan 760