Zoom backgrounds work by some sort of machine learning to identify humans while the Photo Booth backgrounds just did a diff between an initial image and the cur

Zoom backgrounds work by some sort of machine learning to identify humans while the Photo Booth backgrounds just did a diff between an initial image and the current image, and displayed anything that was different. The plus side to Zoom is that you can move a chair or even the camera without messing everything up. The plus side to Photo Booth is that it had cleaner edges.