Police also discovered covert footage of an unknown female after seizing the 50-year-old man’s phone when they detained him on May 5.
Officers are attempting to find the unidentified victim.
Acting Senior Sergeant Stuart Fairlie said a 17-year-old girl alerted police after she saw the accused allegedly filming her in the bathroom on April 19.
Get in front of tomorrow's news for FREE
Journalism for the curious Australian across politics, business, culture and opinion.
READ NOW“Forensic examination of a shoe left at the scene helped to identify the suspect by DNA,” he said. “Police found a mobile phone with a number of videos of naked women. Three different victims were identified.
“The victim identified herself and her sister.”
The footage dated back to December 12.
Police charged the man, of no fixed address, with 18 counts of using an optical device to record a private activity and 12 counts of trespass.
MORE: Cancer Council WA puts out call for therapist volunteers
MORE: Curtin Uni professor plays key role in Zika virus study
MORE: Scarborough businesses suffer as City scrambles to help