While text entry is an essential and frequent task in Augmented Reality (AR) applications, devising an efficient and easy-to-use text entry method for AR remains an open challenge. This research presents STAR, a smartphone-analogous AR text entry technique that leverages a user's familiarity with smartphone two-thumb typing. With STAR, a user performs thumb typing on a virtual QWERTY keyboard that is overlain on the skin of their hands. During an evaluation study of STAR, participants achieved a mean typing speed of 21.9 WPM (i.e., 56% of their smartphone typing speed), and a mean error rate of 0.3% after 30 minutes of practice. We further analyze the major factors implicated in the performance gap between STAR and smartphone typing, and discuss ways this gap could be narrowed.

翻译：尽管文本输入是增强现实（AR）应用中一项必不可少且频繁执行的任务，但为AR设计一种高效且易于使用的文本输入方法仍是一个悬而未决的挑战。本研究提出了STAR，一种类智能手机的AR文本输入技术，它利用了用户对智能手机双拇指打字的熟悉度。在STAR中，用户在一个叠加于手部皮肤上的虚拟QWERTY键盘上进行拇指打字。在STAR的评估研究中，参与者在30分钟练习后，平均打字速度达到21.9 WPM（即其智能手机打字速度的56%），平均错误率为0.3%。我们进一步分析了导致STAR与智能手机打字之间性能差距的主要因素，并探讨了缩小这一差距的可能途径。