Tim Hawker Match Moving Blog

Matching in PFTrack

Before importing into PFtrack I used the lens correction tool in After Effects and exported as 720p footage with a pixel aspect ratio of 1.0. I was slighly worried that there would not be enough points to track properly when the camera pans left, but the arial and other sharp corners proved very useful. When filming we made sure that the camera was mounted as far back as possible on the tripod to reduce parallax error. Due to the footage being converted into sqare pixels, I changed the film back to 6.2x3.5mm. The focal length used was 7.5mm. After tracking and solving, the scene was scaled before exporting to match the real size of the building.