241 citations · 508 across the 14 of their papers we have counts for
4 papers · 1 filter
Curvature Under Attack in hZACH-ViT: Gauge Symmetry, Boundary Saturation, and Adversarial Failure
Athanasios Angelakis, Marta Gomez-Barrero
Curvature is often treated as an intrinsic property of a representation, although its empirical effect also depends on coordinate scale, learned logit temperature, and numerical sa…
From ECG Signals to Representative-Morphology Heatmaps for Biometric Recognition
Athanasios Angelakis, Marta Gomez-Barrero
Electrocardiography (ECG) contains subject-specific morphology that supports biometric recognition, yet image-based performance depends on how the waveform is rendered. We introduc…
Compact Vision Models for Iris Presentation Attack Detection under Presentation Attack Instrument Shift and Environmental Degradation
Athanasios Angelakis, Marta Gomez-Barrero
Iris presentation attack detection (PAD) is security-critical when a subsystem that appears reliable during development encounters presentation attack instruments (PAIs) or acquisi…
Extending ZACH-ViT to Robust Medical Imaging: Corruption and Adversarial Stress Testing in Low-Data Regimes
Athanasios Angelakis, Marta Gomez-Barrero
The recently introduced ZACH-ViT (Zero-token Adaptive Compact Hierarchical Vision Transformer) formalized a compact permutation-invariant Vision Transformer for medical imaging and…