Added calibration routine.  The calibration launches at beginning of program and stays for about 5 seconds.  Place you hand on the left image for calibration and hold there until about 5 seconds.

Need to tweak parameters.
Added Calibration routine.  It will launch at beginning of program and stay waiting for 5 seconds before using whatever it captures inside the rectangle for performing calibration (note: calibration based on left image at the moment).

Need to tweak parameters for histogram.