Author

C. A. Casado

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#artificial intelligence Preprint Oct 2026

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

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 expl...

Yun-Xiang Luo, C. Álvarez Casado, Xiao-Ting Wu et al. · 0 citations

Preprint Oct 2026

Oracle headroom without signal: null-calibrated evaluation of candidate selection for thermal heart rate estimation

Camera-based physiological monitoring can produce multiple estimates from several facial regions, extraction methods, and processing settings. Signal quality indices aim to select reliable estimates without a physiological reference, and their potential is often assessed with an oracle that selects the estimate closest...

M. Rahman, Nhi Nguyen, Sasan Sharifipour et al. · 0 citations

Preprint Sep 2026

GA-EIRFS: A Geometry-Augmented Repeat-Factor Sampling Method for Long-Tailed LiDAR 3D Object Detection

Long-tailed 3D object detection is treated as a class-frequency problem, but LiDAR supervision quality depends on object observability: similar frequencies can hide different geometric evidence. We introduce Geometry-Augmented Exponentially Weighted Instance-Aware Repeat Factor Sampling (GA-EIRFS), a detector-agnostic...

Taufiq Ahmed, C. A. Casado, Daniel Herrera Castro et al. · 0 citations

#machine learning Sep 2026

Phenomenon-Graph JEPA: Label-Efficient Representation Learning for Contactless Cardiorespiratory Sensing

The study separates the measured benefit of predictive representations from the physiological prior used to organize their training, and presents Phenomenon-Graph JEPA, a joint-embedding predictive architecture that learns from four processed one-dimensional streams without negative pairs or synthetic augmentation in i...

C. Álvarez Casado, Nhi Nguyen, Mohammad Rahman et al. · arXiv.org · 0 citations

#machine learning Preprint Sep 2026

Handwritten Digit Leakage from Smartphone Motion Sensors Across Unseen Users and Phone Models

Digits are thus predictable beyond familiar users and phone models under assumed segmentation, while acquisition-order shortcuts limit conclusions about practical privacy exposure.

C. A. Casado, Erkka Rantahalvari, Matteo Pedone et al. · 0 citations

#machine learning Apr 2026

Selfie-Capture Dynamics as an Auxiliary Signal Against Deepfakes and Injection Attacks for Mobile Identity Verification

The findings support selfie-capture motion as a low-friction auxiliary signal, while leaving cross-device, cross-session, and real injection-attack evaluation as necessary next steps.

Erkka Rantahalvari, Olli Silvén, Z. Boulkenafet et al. · arXiv.org · 1 citation