arXiv:2601.03907cs.RO2026-01中稿 · publication in Fro…被引 1

用事件驱动的视觉传感器实现大面积柔性触觉皮肤,响应快且省电。

An Event-Based Opto-Tactile Skin

  • 通过双摄像头侧视皮肤,以事件流检测压力变化并三角定位
  • 在4620mm²区域定位误差仅4.66mm,1/1024数据量下仍保持85%有效率
  • 低延迟(31ms)且极端稀疏数据仍可用,适合低功耗软机器人

本文提出一种基于动态视觉传感器(DVS)与柔性硅胶光波导皮肤的神经形态、事件驱动触觉传感系统。该系统不重复扫描嵌入式光电接收器,而是采用两个侧视的DVS相机,通过检测亮度变化产生事件,并利用密度聚类算法(DBSCAN)识别按压事件的质心,结合三角测量法估计二维皮肤表面的压力位置。在4620 mm²的探测区域内进行蛇形扫描测试,95%可见按压事件的定位均方根误差(RMSE)为4.66 mm。进一步实验显示,当事件流随机下采样至原数据的1/1024时,平均定位误差仅升至9.33 mm,仍有85%试验成功定位,表明系统在极稀疏事件下仍具实用性。该特性对降低未来应用中的功耗与计算负载具有重要意义。系统检测延迟分布特征宽度为31毫秒。

原文摘要 · Abstract (English)

This paper presents a neuromorphic, event-driven tactile sensing system for soft, large-area skin, based on the Dynamic Vision Sensors (DVS) integrated with a flexible silicone optical waveguide skin. Instead of repetitively scanning embedded photoreceivers, this design uses a stereo vision setup comprising two DVS cameras looking sideways through the skin. Such a design produces events as changes in brightness are detected, and estimates press positions on the 2D skin surface through triangulation, utilizing Density-Based Spatial Clustering of Applications with Noise (DBSCAN) to find the center of mass of contact events resulting from pressing actions. The system is evaluated over a 4620 mm2 probed area of the skin using a meander raster scan. Across 95 % of the presses visible to both cameras, the press localization achieved a Root-Mean-Squared Error (RMSE) of 4.66 mm. The results highlight the potential of this approach for wide-area flexible and responsive tactile sensors in soft robotics and interactive environments. Moreover, we examined how the system performs when the amount of event data is strongly reduced. Using stochastic down-sampling, the event stream was reduced to 1/1024 of its original size. Under this extreme reduction, the average localization error increased only slightly (from 4.66 mm to 9.33 mm), and the system still produced valid press localizations for 85 % of the trials. This reduction in pass rate is expected, as some presses no longer produce enough events to form a reliable cluster for triangulation. These results show that the sensing approach remains functional even with very sparse event data, which is promising for reducing power consumption and computational load in future implementations. The system exhibits a detection latency distribution with a characteristic width of 31 ms.

触觉传感事件驱动软机器人神经形态

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