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The edges of individual eyebrow hairs, which are visible on a normal photo like this one, are lost when two photos are merged together
Jurgen Falchle / Alamy
Suspiciously smooth eyebrows could be a giveaway for criminals who try to evade artificial intelligence-powered border crossings by using passports with doctored images.
Abdullah Zafar and Christoph Busch at the Norwegian University of Science and Technology say the increased use of automatic face recognition at border crossings means it is often an AI, rather than a person, that checks whether a traveller’s face matches the identity…
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