Enable Face Liveness Detection

The FindFace Multi face liveness detector tells apart live faces from face representations, such as face images, videos, or masks. The liveness detector estimates 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.

The face liveness detector can be automatically enabled and configured during the installation. If you skipped this step, you can manually enable it later, following the instructions below.

Note

The face liveness detector functions on both GPU- and CPU-acceleration. However, it is much slower on CPU.

In this section:

Enable Face Liveness Detector

To enable the face liveness detector, do the following:

1. Open the /opt/findface-multi/configs/findface-video-worker/findface-video-worker.yaml configuration file. In the liveness section, specify the neural network models as shown in the example:

   GPU

   sudo vi /opt/findface-multi/configs/findface-video-worker/findface-video-worker.yaml
   
   liveness:
     fnk: /usr/share/findface-data/models/faceattr/liveness.pacs.v2.gpu.fnk
     norm: /usr/share/findface-data/models/facenorm/facenorm.multicrop_full_crop2x_size400.gpu.fnk
   ...
   

   CPU

   sudo vi /opt/findface-multi/configs/findface-video-worker/findface-video-worker.yaml
   
   liveness:
     fnk: /usr/share/findface-data/models/faceattr/liveness.pacs.v2.cpu.fnk
     norm: /usr/share/findface-data/models/facenorm/facenorm.multicrop_full_crop2x_size400.cpu.fnk
   ...
   

2. Restart the findface-multi-findface-video-worker-1 container.

   sudo docker container restart findface-multi-findface-video-worker-1
   

Configure Liveness Threshold

If necessary, you can adjust the liveness threshold in the /opt/findface-multi/configs/findface-multi-legacy/findface-multi-legacy.py configuration file. The liveness detector will estimate 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 that you seek advice from our experts at support@ntechlab.com.

sudo vi /opt/findface-multi/configs/findface-multi-legacy/findface-multi-legacy.py

FFSECURITY = {
    ...
    # feature specific confidence thresholds
    'LIVENESS_THRESHOLD': 0.674,  # model: [liveness.pacs.v2]
    ...

Restart the findface-multi-findface-multi-legacy-1 container if you have configured the liveness threshold.

sudo docker container restart findface-multi-findface-multi-legacy-1