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UPDATE 31 August 2019:  See my RoadTest of the Raspberry Pi 4B using OpenCV to do face recognition here UPDATE 23 August 2019:  This is an update of an earlier post about a RoadTest of the Raspberry Pi 4B with a comparison to the Raspberry Pi 3B+ using OpenCV to do facial recognition.  Issues were identified in that post that held up the RoadTest.  The issues have now been resolved and the solution posted at the bottom of this post.   I am one of the fortunate persons ...