[NickNameNick]

I shared an office space with a company that provided video analysis and recognition as a commercial expert witness service. (This was in The UK).

They had a system of levels of confidence they would use in their reports when identifying someone.

The highest level of confidence was achieved when a close friend or family member identified the person in the picture of video.

There were progressively lesser levels of confidence for people less close to the purported subject of the image.

They also had a system of points of similarity/difference. but they normally only used that to establish that the same subject had been observed by multiple cameras, rather than to establish the identity of the subject.