arXiv:2504.16183cs.RO2025-04被引 4

通过量化形状补全不确定性,提升机器人抓取成功率。

Measuring Uncertainty in Shape Completion to Improve Grasp Quality

  • 在单视角点云上计算3D形状补全的不确定性
  • 引入不确定性改进抓取姿态质量评分,提升抓取成功率
  • 实测7自由度机械臂抓取家用物体,排名前5抓取成功率达最优

近年来,形状补全网络被用于真实机器人实验中,以补全因自遮挡导致观测不完整环境中的物体信息。当前多数方法依赖深度神经网络处理丰富的3D点云数据,生成更精确、真实的物体几何结构。然而,这些模型因推理过程具有非确定性/随机性,仍存在误差,在抓取场景中误差累积可能导致抓取失败。本文提出一种在单视角点云推理时计算3D形状补全模型不确定性的方法,并改进抓取姿态算法的质量评分,引入完成点云中的不确定性。我们通过7自由度机械臂搭配双指夹爪,在大量家用物体上进行真实世界抓取实验,对比了不测量不确定性的先前方法。结果表明,本方法能更准确评估抓取质量,使排名前五的抓取候选成功率优于现有最先进水平。

原文摘要 · Abstract (English)

Shape completion networks have been used recently in real-world robotic experiments to complete the missing/hidden information in environments where objects are only observed in one or few instances where self-occlusions are bound to occur. Nowadays, most approaches rely on deep neural networks that handle rich 3D point cloud data that lead to more precise and realistic object geometries. However, these models still suffer from inaccuracies due to its nondeterministic/stochastic inferences which could lead to poor performance in grasping scenarios where these errors compound to unsuccessful grasps. We present an approach to calculate the uncertainty of a 3D shape completion model during inference of single view point clouds of an object on a table top. In addition, we propose an update to grasp pose algorithms quality score by introducing the uncertainty of the completed point cloud present in the grasp candidates. To test our full pipeline we perform real world grasping with a 7dof robotic arm with a 2 finger gripper on a large set of household objects and compare against previous approaches that do not measure uncertainty. Our approach ranks the grasp quality better, leading to higher grasp success rate for the rank 5 grasp candidates compared to state of the art.

3D补全机器人抓取不确定性建模

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