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Last week we talked about how people recognize objects and really how well people recognize objects, given how difficult the problem is, given how objects can be seen in all different sorts of illumination, in different positions, in different angles. And yet we are able to extract that information, we are able to take the visual stuff out there, interpret it in a way that allows us to recognize all the different things that we can in our environment. Today we’re gonna kind of carry on looking at that, but we gonna look at what’s really a special class of objects. That’s the human face. So we gonna look at how we recognize human faces and how we do it quite as well as we do. We’re really expert at recognizing faces. So again we can think about how do we take that visual information and how do we transform it into a form which allows us to put a name to a face, and to do all the other clever things that we can do with faces. So I’m gonna start off again by just pointing out that it’s a hard problem. Face recognition is a hard problem, and it’s a clever thing we do. If you think about all the different types of faces you can recognize, and all the different types of information you can get from the face, you kind of start to appreciate how well we can do face recognition.