BioID® Anti-Spoofing Liveness Detection
“Are you really there?”
BioID®’s patented “fake defender” liveness detection uses several techniques, including:
- Capturing multiple face images and checking for changes and natural motion. A 3D face moves differently from a 2D photo, and our sophisticated algorithms can detect this difference.
- Detecting video replays and other copies with a special patent-pending texture-based algorithm that knows when a recaptured version of a person is presented instead of a real person.
- Guiding the user to turn their head a certain way and verifying that the head was turned in the specified direction.
- Requiring the user to speak multiple words or digits presented in a random order.
Techniques for live detection in biometrics
More sophisticated techniques use 3D cameras to look for depth information from a 3D face, or infrared cameras to detect thermal information. However, both require special equipment and so are not compatible with most webcams and mobile phone cameras available today.
Another method called optical flow analyzes movement between two or more pictures, because a 3D face moves differently from a 2D photo. The capture of the second photo can be triggered with sensitive motion detection, so that an attacker cannot simply present two slightly different photos; the second image would be captured before the attacker’s second photo was in place. This has proven to be an excellent way to detect and block fraud using a photo, and is one of the methods BioID® uses in its “fake defender”.