Modeling Gliding-based Target Selection for Blind Touchscreen Users.
Modeling Gliding-based Target Selection for Blind Touchscreen Users.
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为盲人触摸屏用户建模基于滑动的目标选择。
DOI：
10.1145/3447526.3472022
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Bi,Xiaojun
中科院分区：
文献类型：
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作者：
Ko,Yu-Jung;Feiz,Shirin;Ramakrishnan,IV;Putkonen,Aini;Wang,Yuheng;Oulasvirta,Antti;Aydin,AliSelman;Ashok,Vikas;Bi,Xiaojun
在触摸屏上滑动手指到达目标，即触摸探索，是盲屏阅读器用户常见的选择方式。本文研究了它们的滑翔行为，并提出了它们运动性能的模型。我们发现，盲人的滑行轨迹是两种策略的混合：1)依靠非视觉反馈进行迭代修正的弹道运动，2)多个子运动由停止分隔，并串联直到到达目标。基于这一发现，我们提出了混合指向模型，该模型将运动时间与目标的距离和宽度联系起来。该模型优于已有的模型，将R2从Fitts定律的0.65提高到0.76，并且在交叉验证和信息标准方面具有优势。该模型促进了对基于滑动的目标选择的理解，并作为基于屏幕阅读器的触摸探索的界面布局设计工具。
Gliding a finger on touchscreen to reach a target, that is, touch exploration, is a common selection method of blind screen-reader users. This paper investigates their gliding behavior and presents a model for their motor performance. We discovered that the gliding trajectories of blind people are a mixture of two strategies: 1) ballistic movements with iterative corrections relying on non-visual feedback, and 2) multiple sub-movements separated by stops, and concatenated until the target is reached. Based on this finding, we propose the mixture pointing model, a model that relates movement time to distance and width of the target. The model outperforms extant models, improving R2 from 0.65 for Fitts’ law to 0.76, and is superior in cross-validation and information criteria. The model advances understanding of gliding-based target selection and serves as a tool for designing interface layouts for screen-reader based touch exploration.