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Check 03 · liveness prompts

A person, not
a photo.

The member follows a few short prompts on screen — blink, smile, turn your head. A printed photo or a picture on another screen cannot follow them, so this makes the easiest kind of cheating much harder.

Prompts
blink, smile and turn — followed live in front of the camera
Rules
hand-written image checks, not a trained anti-spoofing model
None
success rate published
Evidence
for the reviewer — liveness never verifies anyone alone
What the software does

Prompt, watch,
score.

Frame by frame, while the prompts run on the member’s screen.

  1. 01

    Find the face

    A face detector locates the face in each frame. If the face does not move at all between frames, that counts against the session.

    Movement
  2. 02

    Follow the prompts

    Eye and smile detectors and an estimate of where the head is turned check that each prompt was actually carried out.

    Challenge
  3. 03

    Look at the image

    Texture, reflection and frequency checks look for the marks a printed photo or a screen leaves. These are rules, and they are logged rather than allowed to block on their own.

    Image texture
  4. 04

    Score the session

    The prompt results and image checks are combined into a liveness score. A session without a liveness result goes to a reviewer.

    Liveness score
Said plainly

It raises the bar.
It is not a wall.

Liveness prompts stop a held-up photo. Someone determined, with video or other tools, could get further. That is why liveness is one piece of evidence a reviewer weighs, alongside the document and the face match — not a gate that verifies anyone by itself.

L.01
What it catches

A printed photo, a still picture held up to the camera, a face that never moves.

L.02
What it may miss

A well-made video or a sophisticated replay. We do not claim to detect deepfakes.

L.03
What happens next

The score, the prompts and a snapshot go to the reviewer with the rest of the verification.

A person approves every member.
No check on this page verifies anyone by itself. The results go to a reviewer for the organisation, who approves or rejects — and that decision, with their name and any note they add, is written to the record. Where a member needs help at a station, a returning officer assists and is named too.
What it does not do

What the liveness check
does not do.

Detect deepfakes
The image checks are rules for spotting photos and screens. There is no trained deepfake detector behind them.
Give a spoof-block rate
We publish no success or failure rate for liveness.
Use 3D face mapping
It works from an ordinary phone or tablet camera, frame by frame.
Verify a member
A good liveness score is evidence for the reviewer, nothing more.
The four checks

Ask us how it
handles your roll.

Bring your questions to a briefing — about review queues, officer assists, data protection and what happens when a check is unsure.

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