The Government has moved to expand the use of the software, which Sarah Jones, the policing minister, previously called the “the biggest breakthrough for catching criminals since DNA matching”.
However, civil rights groups have opposed the plans, warning that the expansion would enable “historic breaches of Britons’ privacy”.
Det Supt Dan St Quintin, gold commander for the fair, said: “The Live Facial Recognition technology will help us to identify the minority who are either intent on causing trouble or here to commit crime.
“Once we have spotted the potential troublemakers, we will have our officers on the ground able to approach the individual, take them to one side, and speak with them.”
The fair is expected to take place this year from June 4 to June 10. It usually attracts up to 10,000 Roma and travellers, as well as hundreds of horse-drawn cars and 30,000 visitors.
Horses are washed and ridden in the River Eden in a tradition that has its origins in the 18th century.
During the fair, Cumbria Constabulary will compile a watchlist before each deployment that includes individuals wanted by police or the courts, as well as those who may pose a risk to themselves or others.