Just did a bit of research on facial recognition software and how it could possibly be tweaked, depending on the conditions of the outdoor location (i.e, lighting, angle, etc).
Facial recognition software generally looks at certain “nodal” points which are found on a face. These might include points between the eyes, ears, nose and the head. So for example, a situation arises where a person’s face “merges” with the background in terms of, say colour or brightness, the software might not work as efficiently as it should. In such cases, it might be possible to just tweak the parameters of the facial recognition software to compensate for certain external factors.
Links:
http://mambo.ucsc.edu/psl/beymer.html
http://mambo.ucsc.edu/psl/ntt.html
