If the person in the video is to be the same
person whose face information have been stored, the number of
facial features regenerated from this video image must be same
or close enough (inside some pre decided threshold number)
with the number of facial features those have already been
stored in the same ambient light condition. If the person is to be
a different person than the house member, it has been observed
that the number of paired face features has decayed sooner with
respect to time in the real time video.