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arXiv · 2610.15891

Learning Multimodal Sensor Fusion with JEPA Representations for Breathing Activity and Pose Recognition

Yunxiang Luo·Constantino Álvarez Casado·Xiaoting Wu·Nhi Nguyen·Le Nguyen·Manuel Lage Cañellas·Miguel Bordallo López
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Abstract

Predictive video representations do not by themselves specify how a multimodal system should handle missing sensors. We transfer frozen V-JEPA2 features to a set of heterogeneous sensors comprised by RGB video, depth video, and radar time series. A shared fusion model uses modality queries, fixed sensor slots, and explicit availability to classify breathing activity and pose from all seven non-empty sensor subsets. The contribution is a controlled evaluation of subset supervision, pooling capacity, and representation transfer on 39 OMuSense-23 subjects with five subject-group folds and three seeds. With matched downstream parameter counts, the final model reaches recording-level activity macro-F1 of $75.23%\pm0.60$ averaged across seven subsets. Supervising all subsets in each batch improves the matched query-pooling control by 1.923 percentage points (conditional 95% subject-bootstrap interval [0.647, 3.209]), while query pooling shows no clear advantage over matched mean pooling under balanced supervision. Radar probes support transfer beyond pooled wavelet pixels, 64-token inference approximately preserves mean activity performance, and the tested Consensus-JEPA loss adds no measured benefit against its exact control.

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Yunxiang Luo, Constantino Álvarez Casado, Xiaoting Wu, Nhi Nguyen, Le Nguyen, Manuel Lage Cañellas, Miguel Bordallo López. 2026-10-11. Learning Multimodal Sensor Fusion with JEPA Representations for Breathing Activity and Pose Recognition. https://arxiv.org/abs/2610.15891

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