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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 * 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         * DONE!
  15 * fire up the face detector only just before going to inactive mode.
  16         * that way the camera isn't running all the time
  17         * maybe start 10 seconds before going inactive, then run until activity
  18 * authenticating a user based on face recognition (as opposed to face
  19 detection)
  20         * much more difficult to do reliably
  21 * be more aggressive with turning off the screen.  dim the screen as soon as
  22 it's not being looked at.  turn it off soon thereafter.
  23         * could be enough to save battery.  would need to power the camera sometimes,
  24         but would save on backlight.  need to test.
  25 * don't prevent sleep when face is detected, but user isn't actually looking at
  26 screen.
  27         * requires pose estimation.
  28         * also requires estimating the direction of the eye.