Trinny and Susannah then monitor how men shop via secret cameras.

The pictures were taken via old-fashioned cameras, and were thus black-and-white.

However, in areas where humans are typically absent, they have been observed via remote-controlled, hidden cameras, hunting during the daylight hours.

The operating theatre is visible to the public and surgery is sent via cameras above the operating table to screens in the gallery.

The viewers get to see the action via infra-red cameras in the dark room.

He had not been far away, listening in on the proceedings via concealed cameras and microphones.

They could possibly be tracked via attached cameras or ultrasonic signals.

Referred to as "control", the player views events via hidden cameras set up in eight different locations, which can be viewed one at a time.

The current product features include: object tracking, video surveillance, face recognition, content based multimedia search and human interaction control via cameras.

The company gained notoriety last summer when the Tampa, Fla., police used its technology to search via closed-circuit cameras for wanted criminals among weekend crowds.