JOEL WILLIAMS, ASSOCIATE EDITOR [email protected]New technology from researchers at Tel Aviv University has the potential to help cameras recognize colors that are invisible to the human eye. The development has potential to advance applications in fields such as computer gaming, photography, security, medicine, and astronomy. The technology relies on imaging upconversion, a nonlinear optical technique in which mid-infrared photons combine with pump photons in a nonlinear crystal and are converted into visible near-infrared photons. 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