Fourthline’s biometrics products analyze the client's facial traits and confirm they are the person they claim to be.

We offer the following:

Product	Description
Selfie Photo	We perform a facial similarity check between a selfie of the client and the portrait on their ID document to confirm they are the document holder.
Selfie Liveness	We record video of the client’s face as they turn their head left then right to confirm they are a living human being who is physically and voluntarily participating.
Selfie Audio	Optionally, we can record audio while the client takes the selfie photo and performs the liveness check. This helps detect fraud, e.g. a third party instructing or coercing the client.

Selfie Photo

The client takes a selfie and Fourthline performs a facial similarity check against the portrait on their ID document to confirm they are the document holder.

The client mustn't receive assistance from any third party while taking the selfie photo. They can wear glasses but their face must otherwise be fully visible, e.g. no surgical face masks.

Selfie - introduction — Introduction screen

The client positions their face within the mask and takes a selfie, and then confirms the photo.

Fourthline first tries to take the selfie photo automatically. This involves loading and starting facial recognition models, and then waiting until the device is steady and the client's face is correctly positioned. If we can't take the photo automatically, a Take photo button appears.

Fourthline performs the following checks:

Check	Description	Required
Self-capture	The client took the selfie themselves during the workflow using the device camera, and it wasn't otherwise inserted via captures, camera roll or library sources, or by any third party.
Image quality	The quality of the selfie photo is acceptable so that we can process it correctly.
Single face	There is only 1 face visible in the photo for GDPR compliance.
Authenticity	The selfie is authentic (not a photo of another photo or a screen) and a true likeness of the client.
Facial similarity	The face in the selfie matches the ID document portrait. We compare the faces and generate a percentage similarity score. We automatically accept scores of at least 90%. If the score is less than 60%, our human agents perform an additional four-eyes review.

We send selfies back if we detect that:

The selfie doesn't show the client’s face.
The selfie photo is of another photo, even if the selfie video is authentic and shows motion.
There are multiple faces in the selfie photo.
The angle of the selfie photo doesn't let us compare it against the document portrait.
The selfie photos is poor quality, e.g.:
- The client is too far from the camera.
- The client’s eyes are closed.
- The client is wearing sunglasses, or a reflection off glasses is covering their eyes.
- The client is not looking straight at the camera. In this case, we check the device model before sending back, because it might still be acceptable.

Selfie Liveness

The client turns their head left, then right to confirm they are a living human being who is physically and voluntarily participating, while Fourthline records video.

Note

Clients generally don’t know that we record video because this helps us detect fraud.

Client performs liveness check — Selfie Liveness

Fourthline performs the following checks:

Check	Description	Required
Self-capture	The client did the liveness check themselves and responded as directed to turn their head left and then right. The selfie video was recorded using the device camera, and not inserted via video captures, camera roll or library sources, or by any third party.
Image quality	The image quality of the selfie video is sufficient for us to process it correctly.
Authenticity	The selfie video is authentic and shows a live client who is voluntarily participating. We automatically check that: • It is not a video of a video. • The client moves their head sufficiently. • The client isn’t wearing a physical or digital mask.

Next steps

Learn how to combine these products in your Identity Verification solution.

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