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   1 prevent the system from sleeping when a user is looking at the screen.
   2
   3 this is accomplished using the built-in camera on my laptop screen's top bezel
   4 and opencv to detect a face.  i'm going to use the API used by the default movie
   5 player in ubuntu for preventing system sleeps.
   6
   7 OTHER IDEAS:
   8 1. detecting a face could simulate user activity.  this would prevent sleeping
   9 and bring up the password prompt when the system is already asleep.
  10         * how cool would that be?  if the system is asleep and you sit down at it, the
  11         password prompt comes up before you touch anything!
  12         * or if the screen saver doesn't lock the screen, then the laptop just wakes
  13         up.
  14 2. authenticating a user based on face recognition (as opposed to face
  15 detection)
  16         * much more difficult to do reliably
  17 3. be more aggressive with turning off the screen.  dim the screen as soon as
  18 it's not being looked at.  turn it off soon thereafter.
  19         * could be enough to save battery.  would need to power the camera sometimes,
  20         but would save on backlight.  need to test.
  21 4. don't prevent sleep when face is detected, but user isn't actually looking at
  22 screen.
  23         * requires pose estimation.
  24         * also requires estimating the direction of the eye.