http://www.techradar.com/news/advanced-facial-recognition-could-be-coming-to-the-samsung-galaxy-s9

Although Samsung included face unlock functionality with its Galaxy Note 8, S8 and S8 Plus handsets, it was quickly upstaged by Apple's own Face ID technology on the iPhone X, which took a 3D scan of the user's face to provide more advanced security. 

Now, it appears that Samsung is planning to update its facial unlock tech with 'Intelligent Scan Biometrics', according to hidden information discovered by SamCentral in the Note 8's Oreo beta settings APK.