Robust Surface Recognition With the Maximum Mean Discrepancy: Degrading Haptic-Auditory Signals Through Bandwidth and Noise

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Behnam Khojasteh - , Max Planck Institute for Intelligent Systems, University of Stuttgart (Author)
  • Yitian Shao - , Clusters of Excellence CeTI: Centre for Tactile Internet, Max Planck Institute for Intelligent Systems (Author)
  • Katherine J. Kuchenbecker - , Max Planck Institute for Intelligent Systems, University of Stuttgart (Author)

Abstract

Sliding a tool across a surface generates rich sensations that can be analyzed to recognize what is being touched. However, the optimal configuration for capturing these signals is yet unclear. To bridge this gap, we consider haptic-auditory data as a human explores surfaces with different steel tools, including accelerations of the tool and finger, force and torque applied to the surface, and contact sounds. Our classification pipeline uses the maximum mean discrepancy (MMD) to quantify differences in data distributions in a high-dimensional space for inference. With recordings from three hemispherical tool diameters and ten diverse surfaces, we conducted two degradation studies by decreasing sensing bandwidth and increasing added noise. We evaluate the haptic-auditory recognition performance achieved with the MMD to compare newly gathered data to each surface in our known library. The results indicate that acceleration signals alone have great potential for high-accuracy surface recognition and are robust against noise contamination. The optimal accelerometer bandwidth exceeds 1000 Hz, suggesting that useful vibrotactile information extends beyond human perception range. Finally, smaller tool tips generate contact vibrations with better noise robustness. The provided sensing guidelines may enable superhuman performance in portable surface recognition, which could benefit quality control, material documentation, and robotics.

Details

Original languageEnglish
Pages (from-to)58-65
Number of pages8
JournalIEEE Transactions on Haptics
Volume17
Issue number1
Publication statusPublished - 1 Jan 2024
Peer-reviewedYes

External IDs

PubMed 38252576

Keywords

Keywords

  • Haptic-auditory sensing, haptic surface recognition, kernel methods, machine learning, Touch Perception, Fingers, Humans, Mechanical Phenomena, Haptic Technology, Touch