This takes me back to the time when I wanted to determine which of my two cats is the one who makes the first move in their daily game of shess (it's like chess, but both the colours are black/brown and you don't move pieces - you just place them) in the bathroom. I hooked a webcam to an old netbook and downloaded an app which would take a picture whenever it detected motion. What I didn't take into account was the m…
Picture based detection can be a time sink by itself.