個人化調整觸控平板參數以改善動作技能障礙人士之操作易用性

Abstract

觸控螢幕裝置-如iPad已成為市場新主流，擁有比電腦更高的可攜性，以觸控螢幕取代實體按鍵，可用來查看電子郵件、閱讀雜誌、傳送訊息、瀏覽網頁，還有超過30萬個應用App，提供學習、娛樂、等實用工具。為提升觸控平板對於有動作技能障礙人士之易用性，本研究針對觸控平板裝置之核心控制手勢，招募15位腦性麻痺受試者記錄與分析其操作動作，發現有69%的錯誤來自於點按後的觸控點移動，導致系統的誤判。本研究提出TapAssist，透過個人化的系統參數調整，改善動作技能障礙人士之平板易用性。研究結果指出相較於iPad內建之手勢辨識機制，TapAssist顯著改善點按時的正確辨識率。

Although touchscreens may require less physical demand than physical buttons and offer faster input compared to mouse, trackball, and stylus for people with motor impairments, many usability challenges remain. Our user study with 15 participants with Cerebral Palsy showed that most significant source of tapping errors was due to the system's gesture recognizer incorrectly recognizing tapping as scrolling (69%), followed by the participants missing the targets (49%). We present TapAssist, which personalizes touchscreen settings for individuals with motor skill impairments to improve tapping performance. TapAssist adapts gesture recognizer settings to an individual by measuring the distance of un-intended movements when tapping, called touch slop. It then adjusts the touch slop threshold to improve the recognition of tapping and scrolling. Study results showed that TapAssist significantly improved tapping recognition rate by a factor of 2 (from 45% to 90%) and the overall tapping success rate by a factor of 2.25 (from 20% to 45%) compared to iPad's gesture recognizer.