ScraTouch: Extending Interaction Technique Using Fingernail on Unmodified Capacitive Touch Surfaces
ScraTouch: Extending Interaction Technique Using Fingernail on Unmodified Capacitive Touch Surfaces
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We present ScraTouch, an interaction technique using fingernails, as a new input modality by leveraging capacitive touch sensing. Differentiating between fingertip and fingernail touches requires only tens of milliseconds worth of shunt current data from unmodified capacitive touch surfaces, thus requires no hardware modification. ScraTouch is simple but practical technique for command invocation and mode switching. An evaluation using a point-and-select task on a touchpad showed that although the switching between the finger and nail in ScraTouch required a little more time compared with the baseline (finger touching without mode switching), in overall the operations, ScraTouch was just as fast as the baseline, and on average, 29 % faster than a long press with 500-ms threshold. We also confirmed that setting a simple threshold on the measured shunt current for recognition works robustly across users (97 % accuracy).
静電容量方式のタッチパッドやタッチパネルにおいて，手指の爪を介したタッチ入力手法であるScraTouchを提案する．本手法はタッチサーフェス内電極からの流出電流値変化により爪の接触有無を検出し，指のタッチと区別することで，新たな入力をタッチサーフェス操作へ導入する．本論文では，ラップトップPC搭載のタッチパッドを対象に初期的な調査を行い，通常の指によるタッチ入力と爪によるタッチ入力の電気的特性の差異による識別可能性について検討し，また，本手法の適用可能性について議論する．
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Kaori Ikematsu and Shota Yamanaka. 2020. ScraTouch: Extending Interaction Technique Using Fingernail on Unmodified Capacitive Touch Surfaces. PACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT), Vol. 4, No. 3, Article No. 81 (September 2020), 19 pages (UbiComp'21) [DOI]
Kaori Ikematsu and Shota Yamanaka. 2020. ScraTouch: Extending Touch Interaction Technique Using Fingernail on Capacitive Touch Surfaces. In the 2020 CHI Extended Abstracts on Human Factors in Computing Systems (CHI ’20 EA). ACM, New York, NY, USA, LBW060, 6 pages
池松 香, 山中 祥太, ScraTouch: 静電容量方式タッチサーフェスにおける手指の爪を使用したタッチ入力拡張技法, 第 27 回インタラクティブシステムとソフトウェアに関するワークショップ(WISS2019) 論文集, 6 pages (ロング発表採択)
WISS2019 登壇発表賞, ScraTouch: 静電容量方式タッチサーフェスにおける手指の爪を使用したタッチ入力拡張技法, 池松 香, 山中 祥太 (2019)
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