CONF Lorenz_ECCV_2026/IDIAP Adaptation Alone Is Not Enough: Understanding the Limits of Foundation Models for Face Presentation Attack Detection Lorenz, Peter George, Anjith Marcel, Sébastien EXTERNAL https://publications.idiap.ch/attachments/papers/2026/Lorenz_ECCV_2026.pdf PUBLIC ECCV 2026 Workshop on Foundation and Generative Models in Biometrics 2026