Microsoft representatives used a student engineering show in Seattle at the weekend to make 3D infrared scans of volunteers that will help test new versions of Windows Hello.As was reported in Geekwire, the idea is to gather real-world scans to improve the accuracy of the facial recognition technology.The scans are to be used purely for research purposes, but the students still signed privacy agreements ensuring this was the case.Windows Hello is expected to use devices such as Intel's RealSense 3D camera for facial recognition.