The van is in Market Square today Monday (13/04).
The specialist LFR team are working with local officers to identify known suspects and deter crime.
Police say advance warning means some individuals may choose to avoid the area, but say that preventing crime is just as important as catching those who break the law.
Anyone is welcome to visit the van to chat to officers and see how the technology works.
According to the Thames Valley Police's website (external link):
Thames Valley Police uses facial recognition technology to prevent and detect crime and help protect the vulnerable.
Facial Recognition is a technology capable of comparing a digital image taken of a human face, against a database of facial images.
Live Facial Recognition is used as a precision crime-fighting tactic to locate people who are of interest to the police. It helps us reduce violence and the risk of harm, prevent and detect crime, apprehend and prosecute offenders, protect the public, secure the administration of justice and maintain public confidence.

It analyses key facial features and generates a mathematical representation of these features called a biometric template. It then compares this template against the biometric templates of known faces in a database, generating possible matches.
Thames Valley Police uses Facial Recognition Technology in two ways:
- Live Facial Recognition (LFR) – this compares a live camera feed of faces against a predetermined watch list to find a possible match that generates an alert.
- Retrospective Facial Recognition (RFR) – this is a post-event tactic which compares still images of faces of unknown subjects (for example, CCTV from a crime scene) against the Police National Database in order to identify the unknown person.

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