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yes. use image convolution to define edges at the eyes and eyebrows. the movement of these edges can serve as parametrized inputs to the system. If you're using blinks (which occur quite rapidly), you're going to need a fairly high frame-rate. computation vs battery life is going to be your struggle i presume.
http://docs.opencv.org/doc/tutorials/imgproc/imgtrans/filter_2d/filter_2d.html
