探討拇指微型手勢之互動介面

Abstract

近期關於感測技術的進步，使得利用拇指微型手勢作為輸入方式得以實現，然而，過去跟介面設計相關的研究主要著重在觸控筆以及手指直接觸控的介面上，關於使用者是如何操作拇指微型手勢仍有許多值得探討的地方。所以，我們讓使用者在不同狀態（靜止站著、行進中）及手位於不同位置（胸前、身體側邊）的狀況下，去利用拇指及食指操作我們所指定的手勢，並將其動作軌跡記錄下來做分析。我們發現：(1)手勢的軌跡會明顯受到不同身體活動的影響，走路時所畫出來的軌跡較不精確(2)在不同的手擺放位置下，手勢的大小、位置以及書寫習慣均會受到影響(3)因為手指結構的關係，手勢本身的複雜度和幾何特徵均會影響到手勢的表現。基於這些發現，我們提出了一些設計的準則，供未來研究或設計拇指微型手勢時，可以設計出好操作的手勢以及具有穩定表現的互動介面。

Recent advances of input sensing technology enable users to perform thumb-tip micro gestures. However, the researches related to interface design mainly focus on stylus and touchscreen input. How well can people perform micro gestures in thumb-tip interactions remains unknown. We conducted an empirical study by analyzing kinematics of fingers when participants performed a series of micro gestures in different mobility (standing and walking) and hand postures (in front or at side of body). Our findings are as follows: (1) The stroke paths were significantly influenced by mobility conditions. Participants drew less accurate gestures when walking. (2) With different hand postures, the sizes, centroid positions, and writing behaviors of micro gestures were also affected. (3) Owing to the hand anatomy, the complexity and the geometry features of micro gestures affects the gesture performance. Based on the findings, we propose design guidelines for easy-to-perform gestures and interfaces with stable performance in thumb-tip micro gesture input.