VICTORIAN police will trial using recording equipment attached to their uniforms to tape their interactions with the public.

The uniform cams will be tested out by police in Melbourne's southern region, The Age newspaper says.

The police union criticised the trial, fearing it could make people reluctant to share information with police, and said information gathered could be used against officers in court.

Police Association assistant secretary Bruce McKenzie called on members not to volunteer for the trial, which he said was the first of its kind in Australia.

Liberty Victoria, which has a history of campaigning against the use of surveillance cameras, said it could see some benefits.

Some highway patrol cars are already fitted with video devices and cameras will be fitted to Tasers, which will become standard issue.

Victoria Police says the idea is still in development and there is no date yet for when the trial will start.

A spokeswoman said individuals would always be given notice when the cameras are switched on.