Deep fakes have so far not learned to simulate heart beats in images, and so they can be detected as fraudulent. But given time they will learn this as well; it’s an arms race.
In other news, heart beats are clearly visible in processed images!
In particular, video of a person’s face contains subtle shifts in color that result from pulses in blood circulation. You might imagine that these changes would be too minute to detect merely from a video, but viewing videos that have been enhanced to exaggerate these color shifts will quickly disabuse you of that notion. This phenomenon forms the basis of a technique called photoplethysmography, or PPG for short, which can be used, for example, to monitor newborns without having to attach anything to a their very sensitive skin.The Subtle Effects of Blood Circulation Can Be Used to Detect Deep Fakes (via Schneier on Security)
Check out the video at 1:30 and then again at 3:18:
The AI’s are certainly going to know a lot about us.