通过独特震动信号提升腕戴触觉显示的识别准确率
Heterogeneous Stroke: Using Unique Vibration Cues to Improve the Wrist-Worn Spatiotemporal Tactile Display
- 为每个触觉单元分配独特震动模式，减少位置混淆
- 26个字母识别率达93.8%，10个数字达92.4%，跨姿势稳定
- 适合需要高精度触觉输入的可穿戴设备开发者
除了简单通知外，腕戴触觉显示（WTD）可通过时空触觉模式（STPs）传递字母与数字等复杂信息。然而，由于手腕皮肤面积有限且空间分辨能力弱，相邻触觉单元易混淆，导致识别准确率低。以往研究的准确率多在特定姿势下测量，实际自由姿态下可能进一步下降。本文提出异质震动（Heterogeneous Stroke）设计概念，为每个触觉单元分配独特振动刺激，有效降低混淆。实验实现中，26个字母识别率达93.8%，10个数字达92.4%，且在多种手臂姿势下保持稳定性能。
原文摘要 · Abstract (English)
Beyond a simple notification of incoming calls or messages, more complex information such as alphabets and digits can be delivered through spatiotemporal tactile patterns (STPs) on a wrist-worn tactile display (WTD) with multiple tactors. However, owing to the limited skin area and spatial acuity of the wrist, frequent confusions occur between closely located tactors, resulting in a low recognition accuracy. Furthermore, the accuracies reported in previous studies have mostly been measured for a specific posture and could further decrease with free arm postures in real life. Herein, we present Heterogeneous Stroke, a design concept for improving the recognition accuracy of STPs on a WTD. By assigning unique vibrotactile stimuli to each tactor, the confusion between tactors can be reduced. Through our implementation of Heterogeneous Stroke, the alphanumeric characters could be delivered with high accuracy (93.8% for 26 alphabets and 92.4% for 10 digits) across different arm postures.
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