Small update on face detection post
Just a quick update on my previous post. I hooked my code up to a D-Bus daemon, and used it to detect if I was sitting behind my desk or not.
I had to position the camera a bit lower, because it would sometimes not recognize my face when I was looking at the bottom of my screen. Having a dual-monitor setup doesn’t help either, since you should ideally position the webcam in the middle of the two displays to have good coverage. I positioned the webcam in the middle of the two displays at the bottom and tilted it upwards, which gives good results:
I guesstimated that if the system couldn’t detect a face for a period of 10 seconds, I would be away from my desk (or at least not paying attention to the screen). I played around a bit with pygtk and notify-python to create a status icon and show notification bubbles whenever my status changed. Here’s what happens when it detects that I’m away from my desk (notice the bubble in the upper right corner):
When I return, the system will change its status icon accordingly and notify me again:
OpenCV is fun! 
Tags: CVtypes, facade, facedetection, opencv, programming, python, webcam