Police will use Big Brother facial recognition cameras at the Coronation to pick out terrorists, Tarquins and tearaways in the crowds.

The artificial intelligence system uses mathematical measurements of people’s faces to compare them to photos on a police watchlist in real time.

When it finds a match a signal is sent to handheld devices alerting up to 29,000 officers stationed among the Royal revellers to the target.

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They can then intervene before threats materialise.

A Metropolitan Police spokesman said the technology – which has recently been approved for widespread use – will be deployed in central London in the build up to Saturday’s ceremony.

“The watchlist will be focused on those whose attendance on Coronation Day would raise public protection concerns, including those wanted for offences or have an outstanding warrant for arrest issued by the courts or those under relevant offender management programmes in order to keep the public safe,” the spokesman said.

“Our tolerance for any disruption, whether through protest or otherwise, will be low.

“We will deal robustly with anyone intent on undermining this celebration.”

In tests Scotland Yard deployed the cameras to scour crowds for individuals on watchlists containing up to 9,000 people including fugitives and offenders matching crime types – such as known muggers.

The software studied faces of anyone who came within around 20ft and compared them to images on the list.

Those who did not match were instantly pixelated – leaving only the faces of suspects exposed.

For the Coronation the tech is likely to be pre-loaded with the faces of suspected or convicted terrorists, known eco warriors who could disrupt the event, wanted criminals and escaped cons.

Stalkers identified as posing a potential danger by the police’s Fixated Threat Assessment Centre will also be planted in the software.

The unit handles 1,000 referrals a year about people who have engaged in ‘threatening or harassing communications towards politicians or the Royal Family’.

The tech is so sophisticated it can track down suspects police have photos of but have been unable to identify, missing people from old snaps, lags from custody pictures and can distinguish between identical twins.

The Met’s director of intelligence Lindsey (corr) Chiswick told the Daily Star: “It’s going to be a game-changer.

“It allows us to specifically target people we actively want to trace allowing us to be more focussed on the right individuals be they suspects, absconders or vulnerable missing people.

“It feels like we have reached a significant moment in the future of policing.”

But Big Brother Watch’s legal and policy officer Madeleine Stone said facial recognition was `an authoritarian mass surveillance tool that turns the public into walking ID cards’ and ‘may be used in China and Russia but has no place on the streets of Britain’.

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“The Coronation should not be used to justify the roll-out of this discriminatory and dangerous technology.

“The hundreds of thousands of innocent people attending this historic event must not be subjected tobiometric police identity checks as part of their celebrations.

“This could mean scores of people will be wrongly flagged as criminals and forced to prove their innocence.

“This dystopian technology must urgently be banned.”

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