Perth, Bunbury police trial body cameras

AAP

Police will start wearing body cameras as part of a trial in Western Australia to see how video footage can help officers in the field and expedite court cases.

The six-month trial of 300 body-worn cameras will be conducted in Perth and Bunbury, and police expect the footage or evidence they capture will help free up court time.

Police Minister Liza Harvey said on Sunday the body-worn video could provide greater credibility for police and result in calmer interactions between officers and offenders because they both know they are being filmed.

Ms Harvey denied it was an invasion of privacy, saying people often use phones to film incidences across Australia.

"I think the community, particularly in Northbridge, understand that there's CCTV everywhere and when they're in a precinct like this they're likely to be captured on film somewhere," she told reporters.

"This is about people who need the intervention of police officers because of their behaviour.

"They will be filmed and we make no apology for that."

Deputy Commissioner Stephen Brown said the cameras were highly visible and officers had a standard script to inform people they were being filmed.