PPGSecure: Vital Signs for Liveness Detection and Face Anti-spoofing

Although the biometrics-based authentication systems are already widely used, they are still vulnerable to spoofing attacks where an attacker can gain access to a user’s biometric and fool the system. For example, an image of the user can be easily obtained from their social media page and it can be used to spoof the authentication system. I am working on vital signs extraction from a camera in order to verify the liveness of the face presented to the authentication system. Hemoglobin present in the blood absorbs in the green channel spectrum, therefore; as blood volume changes over time with the cardiac cycle, these small color changes signs can be measured from a regular webcam by observing intensity changes in the green spectrum. Careful spectral analysis of these signals can allow to distinguish between a live face and a fake. [poster download] [publication pdf]