I've been using the ID Card Classifier in the program called "Classification Services" for the last days. It works quite vell (there are some false positives however!).
How does it actucally do the classification ? I have approx 70-80 samples in the system.
Does it "just" turn the input image around until it finds a match or? Next week I have to tell a potiential customer about it, so it would be nice to know some technical details about it :-)