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1 1,a) % 19.8% 9.8% One-hand and Eyes-free Text Input System on Touch Panel of Mobile Devices Yoshitomo Fukatsu 1,a) Buntarou Shizuki 2 Jiro Tanaka 2 Abstract: In this paper, we explain the kana letter text input system for eyes-free typing on mobile devices. This system uses touch panel as input device. To enable eyes-free typing with accuracy, it uses kana letter input based on 2 stroke input. First users manipulate flick operation for consonant input, and then vowel input similarly. We conducted an experiment to evaluate accuracy of input. Participants error rates of input ranged from 3.6% to 19.8%, and the grand mean error rate was 9.8%. 1. fat fingers [1] Karlson [2] 1 College of Media, Arts, Science and Technology, School of Informatics, University of Tsukuba 2 Faculty of Engineering, Information and Systems, University of Tsukuba a) fukatsu@iplab.cs.tsukuba.ac.jp 2 c 2012 Information Processing Society of Japan 1

2 iphone4 ios 2. Sánchez [3] 9 text-to-speech Bonner [4] 8 ABC B iphone VoiceOver VoiceOver Frey [5] Braille iphone Braille Fig. 1 Key arrangement. (This arrangement is not displayed on screen of the device.) 2 Fig. 2 Manipulation of backspace. 3 c 2012 Information Processing Society of Japan 2

3 Fig State transition diagram of input. 3 [6] 50 5 Bezel Swipe[7] [8], [9] Objective-C iphone4 ios5.1 ios c 2012 Information Processing Society of Japan 3

4 情報処理学会研究報告 4.3 実験環境 静音環境の部屋にて実験を行った その部屋には 被験 者 1 名 実験者 本稿の著者 1 名 実験協力者 1 名のみ がいた 4.4 姿勢条件 本手法の利用を想定する場面に応じて 以下に示す 3 つ の姿勢条件を設けた 座り姿勢 図 4a 被験者は 椅子に座り 端末を把持した手を机の下に 構えて 入力を行う 実験者がテスト紙を机の上に置 き 提示する 立ち姿勢 図 4b 被験者は 壁を向いて立ち 端末を把持した手を腰付 近に構えて 入力を行う 実験者がテスト紙を壁に貼 り 提示する 歩き姿勢 図 4c 被験者は 端末を片手に持ち 実験者の後ろに付いて 歩きながら入力を行う この姿勢条件は [10], [11] を参 考に設計を行った 実験者がテスト紙をクリップボー ドに貼り付け そのクリップボードを抱えることによ り 提示する 図 5 a キー配置とバックスペースの操作説明 b フリックの方向と入力文字の対応を示した五十音図 Fig. 5 (a)key arrangement and operating instractions of backspace. (b)kana syllabary that illustrates correspondence of in図 4 a 座り姿勢 b 立ち姿勢 c 歩き姿勢 put characters with flick. Fig. 4 (a) Sitting posture. (b) Standing posture. (c) Walking posture. 被験者に 10 分間自由に入力を行ってもらった 練習 モードにおいては 入力した文字が画面上部に表示さ れる なお この時 操作について不明な点がある場 4.5 実験の手順 1 操作方法と実験の流れの説明 合は質問をしてもらった 3 測定 プロトタイプの操作について キー配置とバックス 3 つの姿勢条件 座り 立ち 歩き において それ ペースの操作説明図 図 5a フリック方向と入力文 ぞれ 提示した短文を測定モード状態のプロトタイプ 字の対応を示した五十音図 図 5b を用いて説明し 図 6b を用いて入力してもらった ただし 3 つの た なお 特に分かりにくいと思われるや行とわ行の 姿勢条件の提示順を被験者毎に入れ替え カウンター フリック方向と入力文字の対応については 入念に説 バランスをとった 明を行った また 文字入力の際の姿勢条件が本手法 測定モードにおいては 画面は常に何も表示がない状 を実際に利用する場面を想定したものとなっているこ 態である 被験者には キー配置図と短文の書かれた とを説明し 速く入力することよりも正確に入力する 紙 図 7 ことを心がける様に依頼した 実験の流れを説明した を行ってもらった 測定を行う前に どちらの手で入 後に 実験への参加について書面による承諾を得た 力を行うか決めてもらい 3 つの姿勢条件すべてにお 2 入力練習 練習モード状態のプロトタイプ 図 6a を用いて c 2012 Information Processing Society of Japan 以下 テスト紙 を見ながら 片手で入力 いて 同じ手で入力を行ってもらった 実験者がテス ト紙を提示したら入力を始め 入力が終わったら 終 4

5 (a) (b) Fig. 6 (a) The screen of practice mode. (b) The screen of measurement mode. Table 1 1 The list of short sentences to input. ID Fig. 7 The test paper that illustrates key arrangement with a short sentence to input c 2012 Information Processing Society of Japan 5

6 A B D E F 1 C 8 9 [12] Fig. 8 Error rate per subject. 9 Fig. 9 Error rate per posture condition. 10 Fig. 10 Number of errors per error type. 11 Fig. 11 Number of errors per error type on each posture % c 2012 Information Processing Society of Japan 6

7 2 Table 2 [ ] Questionnaire result % D % 3 Table 3 D The result of subject D. (The table shows only the sentences that have errors.) ID [13] 36.6% F 52.0% % C 18.8% c 2012 Information Processing Society of Japan 7

8 ios 3 9.8% 3.6% 2 [1] Siek, K. A., Rogers, Y. and Connelly, K. H.: Fat finger worries: How older and younger users physically interact with PDAs, in Proceedings of the Tenth IFIP TC13 International Conference on Human-Computer Interaction, pp , Springer (2005). [2] Karlson, A. K. and Bederson, B. B.: Understanding single-handed mobile device interaction, Technical report, Department of Computer Science, University of Maryland (2006). [3] Sánchez, J. and Aguayo, F.: Mobile Messenger for the Blind, in Proceedings of the 9th conference on User interfaces for all, pp , Springer (2006). [4] Bonner, M. N., Brudvik, J. T., Abowd, G. D. and Edwards, W. K.: No-Look Notes: Accessible Eyes-Free Multi-Touch Text Entry, in Proceedings of the Eighth International Conference on Pervasive Computing, pp , Springer (2010). [5] Frey, B., Caleb, S. and Mario, R.: Brailletouch: mobile texting for the visually impaired, in Proceedings of the 6th international conference on Universal access in human-computer interaction: context diversity - Volume Part III, pp , Springer (2011). [6],,, Vol. 106, No. 535, pp (2007). [7] Roth, V. and Turner, T.: Bezel Swipe: Conflict-Free Scrolling and Multiple Selection on Mobile Touch Screen Devices, in Proceedings of the 27th international conference on Human factors in computing systems, pp , ACM (2009). [8] Jain, M. and Balakrishnan, R.: User Learning and Performance with Bezel Menus, in Proceedings of the 2012 ACM annual conference on Human Factors in Computing Systems, pp , ACM (2012). [9] Bragdon, A., Nelson, E., Nelson, E. and Hinckley, K.: Experimental Analysis of Touch-Screen Gesture Designs in Mobile Environments, in Proceedings of the 2011 annual conference on Human factors in computing systems, pp , ACM (2011). [10] Goel, M., Findlater, L. and Wobbrock, J.: WalkType: Using Accelerometer Data to Accommodate Situational Impairments in Mobile Touch Screen Text Entry, in Proceedings of the 2012 ACM annual conference on Human Factors in Computing Systems, pp , ACM (2012). [11] Nicolau, H. and Jorge, J.: Touch typing using thumbs: understanding the effect of mobility and hand posture, in Proceedings of the 2012 ACM annual conference on Human Factors in Computing Systems, pp , ACM (2012). [12],,, Vol. 28, No. 6, pp (1987). [13] Schildbach, B. and Rukzio, E.: Investigating selection and reading performance on a mobile phone while walking, in Proceedings of the 12th international conference on Human computer interaction with mobile devices and services, pp , ACM (2010). c 2012 Information Processing Society of Japan 8

325 In this research, we created smartphone cases attaching a dimple or a wedge shaped object in order to improve eyes-free and single-handed touch ac

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