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Can (or maybe should) I use facial recognition software to detect non-faces? For example, let’s say I’m trying to find a can of soda in a picture of a bedroom. If I use the haartraining algorithms on many pictures of cans of soda, will the facial recognition feature then find the can of soda in a picture of a bedroom?
Yes you can. Those algorithms are based on extracting features from training sets. If you pass them faces the will be good at detecting features from faces. If you pass them cans they will be good at detecting cans.
A different idea is when you specialize an algorithm on a specific object by restricting the search, but haar are not the case.