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:
Open the
/opt/findface-multi/configs/findface-video-worker/findface-video-worker.yaml
configuration file. In theliveness
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 ...
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