Well, I think the best way is to see as much of what the head is looking at as you can, and then figure out how to move the head to where you want it to be — and to do it with the same motion that you’d normally use when you draw a person, which is usually a forward-moving motion and a downward-moving motion, but sometimes you’ll see them looking up, and so they’re looking at something really weird. So you can see the heads of people that aren’t humans. You see faces, and sometimes you actually get to work with the heads of people — and they will actually smile a little smile at you, sometimes — you get to put them back on the model. You figure out what these heads see, and then you’re looking to work with the face of the model to get the model’s emotions just right.
So this might sound like a really weird question to a computer science student. But most of us are not just doing facial recognition because we’re trying to do things like take better pictures. We’re doing it because there are all kinds of people who walk by our offices everyday and sometimes look at our computers, and those people are doing stuff that can’t easily be done by humans, because they don’t have brains to handle it. I don’t have the time; I don’t have enough free time. But a few years ago, I got to work with John Goodenough, one of our great facial recognition experts, to figure out what it was going to take to create one of those software products for them that was going to be pretty sophisticated.
And so John and I worked and worked, and we figured it out a long time ago. And we knew that there had to be some kind of visual system that I didn’t know about, or couldn’t do. So we spent seven or eight months just trying to figure out how do you get around that and actually do it. And we had to have a way of making that software easy for us to use — you don’t necessarily need to have full control of it to do it, but just enough that it could be done. You couldn’t have a computer, which can do the processing at about two hundred times the speed of a human.
So what that means is that it’s really a software design problem, a hardware design problem. It doesn’t necessarily make sense to ask a computer how to do the face, because I can have any face, and they’ll do that without any
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