Real-time Face Liveness Detection

Important

The face liveness detection can be enabled only on the GPU-accelerated video face detector findface-video-worker-gpu.

To spot fake faces and prevent photo attacks, use the integrated 2D anti-spoofing system that distinguishes a live face from a face image. Due to the analysis of not one, but a number of frames, the algorithm captures any changes in a facial expression and skin texture. This ensures that it is a live person in front of a camera and eliminates the possibility of fraud using images on paper or mobile device screens.

The liveness detector estimates a face liveness with a certain level of confidence and returns the confidence score along with a binary result real/fake, depending on the pre-defined liveness threshold.

In this section:

Enable Face Liveness Detector

To enable the face liveness detector, do the following:

  1. Open the /etc/findface-video-worker-gpu.ini configuration file. In the liveness –> fnk parameter, specify the path to the face liveness detector model as shown below.

    sudo vi /etc/findface-video-worker-gpu.ini

[liveness]
#------------------------------
## path to liveness fnk
fnk = /usr/share/findface-data/models/faceattr/liveness.v1.gpu.fnk

  2. Restart findface-video-worker-gpu.

    sudo systemctl restart findface-video-worker-gpu

Configure Liveness Threshold

If necessary, you can adjust the liveness threshold in the /etc/ffsecurity/config.py configuration file. The liveness detector will estimate a face liveness with a certain level of confidence. Depending on the threshold value, it will return a binary result real or fake.

Note

The default value is optimal. Before changing the threshold, we recommend you to seek advice from our experts by support@ntechlab.com.

sudo vi /etc/ffsecurity/config.py

‘LIVENESS_THRESHOLD’: 0.945,

Face Liveness in Web Interface

Once the face liveness detector configured, you will see liveness estimation for each event.

liveness_en

Use the Liveness filter to display only real or only fake faces in the event list.

liveness_filter_en