arXiv Machine Learning By Ihsan Ul Haq (Centre for Computational Science and Mathematical Modelling, Coventry University, United Kingdom, School of Architecture and Built Environment Deakin University, Australia), James Brusey (Centre for Computational Science and Mathematical Modelling, Coventry University, United Kingdom), Farnad Nasirzadeh (School of Architecture and Built Environment Deakin University, Australia), Chandan Karmakar (School of Information Technology Deakin University, Australia)

Towards Field-Deployable Wearable IMU Systems for Occupational Activity Recognition

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The study evaluates wearable inertial measurement unit (IMU) systems for construction worker activity recognition using the VTT‑ConIoT benchmark. It systematically analyzes six classifiers, five sensor placements, and three window sizes under a leave‑one‑subject‑out protocol, revealing per‑subject accuracy ranging from 61.9 % to 88.7 % (mean 77.5 %). Findings show that multi‑sensor fusion and longer windows improve accuracy, standard augmentation offers modest gains, CTGAN augmentation degrades performance, and personalized calibration can recover up to 16.8 pp for the weakest participants.

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arXiv AI
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arXiv:2607. 06617v1 Announce Type: cross Abstract: Wearable motion sensing provides a continuous and scalable window into human behavior and health, making it a natural fit for foundation models, yet its pretraining and scaling principles remain poorly understood.

By Zongzhe Xu, Aakarsh Anand, Sarah Jiang, Chuntung Zhuang, Zitao Shuai, Sriram Sankararaman, Yuzhe Yang
arXiv Computer Vision
Oct 12

What Egocentric Video Embeddings Encode and How to Combine Them with Inertial Sensors for Human Activity Recognition

The paper investigates what information is captured by egocentric video embeddings from models such as VideoMAEv2, CLIP, DINOv2, and VC-1, finding that the leading principal components largely reflect where the head‑mounted camera is looking. It also explores how to combine these video embeddings with body‑worn inertial sensor data for human activity recognition, showing that propagating inertial predictions over a video‑based graph can significantly improve classification performance (macro‑F1 from 0.648 to 0.852). The study demonstrates that video and inertial modalities play distinct roles—video identifies similar clips within a set, while inertial data labels the activities—yet fusing them directly in a single classifier or adding inertial edges to the graph does not yield better results.

By Kansuke Habano