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arXiv · 2406.15304

Learning Object Compliance via Young's Modulus from Single Grasps using Camera-Based Tactile Sensors

Michael Burgess·Jialiang Zhao·Laurence Willemet
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Abstract

Compliance is a useful parametrization of tactile information that humans often utilize in manipulation tasks. It can be used to inform low-level contact-rich actions or characterize objects at a high-level. In robotic manipulation, existing approaches to estimate compliance have struggled to generalize across both object shape and material. Using camera-based tactile sensors, proprioception, and force measurements, we present a novel approach to estimate object compliance as Young's modulus (E) from parallel grasps. We evaluate our method over a novel dataset of 285 common objects, including a wide array of shapes and materials with Young's moduli ranging from 5.0 kPa to 250 GPa. Combining analytical and data-driven approaches, we develop a hybrid system using a multi-tower neural network to analyze a sequence of tactile images from grasping. This system is shown to estimate the Young's modulus of unseen objects within an order of magnitude at 74.2% accuracy across our dataset. This is an improvement over purely analytical and data-driven baselines which exhibit 28.9% and 65.0% accuracy respectively. Importantly, this estimation system performs irrespective of object geometry and demonstrates increased robustness across material types. Code is available on GitHub and collected data is available on HuggingFace.

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Michael Burgess, Jialiang Zhao, Laurence Willemet. 2024-06-18. Learning Object Compliance via Young's Modulus from Single Grasps using Camera-Based Tactile Sensors. https://arxiv.org/abs/2406.15304

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