Software recognition

Question

Hi all,

Im starting a project, where i have to use 6 cameras (web cams, digital cams, ethernet cams) to control them via software, i have to take a picture and compare each of them to a standar one, and tell how similary are they in %.

Im wondering is there any software, libraries, applications, sourcode in c# or maybe in other plataforms, that you guys know, which i could use.. to learn how or to complement or modify it.

any suggestion??