Labiomancy

They are so proficient in labiomancy that they can follow a private conversation anywhere if they can see the speakers' faces.

Source: wiktionary

Nay, so very well skilled was she in this art (which we may call Labiomancy) as 'tis generally believed (though I could get no personal testimony of it, some persons being dead, and otherers removed into Ireland, who sometimes lay with her), that in the night time when in bed, if she might lay but her hand on their lipps, so as to feel the motions of them, she could perfectly understand what her bedfellows said though it were never so dark.”

Source: wiktionary

Here we shall use the former for no better reason than that it is in common use in Britain and has a more ancient history; Berger (1972a) recounts that three centuries ago the English Dr. Plot was writing on "labiomancy".

Source: wiktionary

Nowadays, face detection is beyond the face recognition sphere and is the essential foundation of expression analysis and labiomancy technology.

Source: wiktionary