A Perth child psychiatrist has been banned from carrying a smartphone after more than 400 images and a dozen videos of young boys were allegedly found on his phone.

Aaron Szen Yang Voon, 41, allegedly filmed young boys' genitals in public toilets, including one child who he followed from a theatre lobby to film him urinating, "focusing on his genital area", a Perth court heard yesterday.

Perth Now reports some of the recordings even show Voon's face when he goes to turn off the camera.

A total of 409 images and 12 videos found on his devices have been deemed child exploitation material.

Voon was granted bail with strict conditions to stop working, surrender his passport, report to police twice a week and pay a $50,000 surety.

He is also banned from going within 100m of public places where children may frequent and must not have any device capable of recording or receiving electronic messages.

Voon was arrested last week when he flew back to Australia from Canada, where he also faces child pornography allegations.

He was arrested in the Canadian city of Edmonton last month after being confronted by the father of a boy he allegedly filmed in a shopping centre public toilet.