A formula calculates the direction of the eye’s gaze based on the shape of this curve. But as you glance to the side, the angle of the curve changes. ![]() If you look directly at a camera, your cornea (the transparent outer covering of the eyeball that covers the pupil and iris) appears perfectly round. To do this, a computer program identifies the line where the iris (the colored part of the eye) meets the white of the eye. Computers can then analyze these images to determine in which direction the people are looking. It requires only a point-and-shoot or video camera that takes high-resolution pictures of people’s faces. That may make them act unnaturally, which could confuse the scientists who study them. The pupil and iris are covered by a transparent membrane called the cornea.įinally, under these circumstances, users know that their eyes are being followed. The iris is the colored area around the pupil. Or they have to wear special contact lenses or headgear so that a computer can read the movement of the centers of their eyes, or pupils. Users often have to keep their heads still. “It’s very exciting.”Įye-tracking technology already exists, Feiner says, but most systems are clunky or uncomfortable to use. “This is a method that people hadn’t thought of before,” says Columbia computer scientist Steven Feiner. Filmmakers, video game creators, and advertisers are finding applications of Nayar’s research as well. Such a capability could help historians and detectives reconstruct scenes from the past. Giving computers the power to trace our gaze could help them interact with us in more humanlike ways. In this case, you can see the sky and buildings Nayar’s computer programs can even pinpoint what a person is looking at.Īfter magnifying the right eye (middle) of the person shown at the left in this high-resolution photo, a computer can use the reflections in the eye (center) to produce an image of the person’s surroundings. ![]() “If you look up close,” he says, “you’re actually getting a reflection of the world.”īy analyzing the eye reflections of people in photos, Nayar and his colleague Ko Nishino have figured out how to re-create the world reflected in someone’s eyes. ![]() In this case, you also see the camera that took the person’s picture.įrom a distance, we see shiny glints in the eyes of other people, says Shree Nayar, a computer scientist at Columbia University in New York City. If you look closely into a person’s eye, you’ll see a reflection of the scene in front of the person. Covered by a layer of salty fluid (tears), their surfaces reflect light just like the surface of a pond does. Our eyeballs are like small, round mirrors. If you look deep into a friend’s eyes, you may imagine that you can see his or her thoughts and dreams.īut more likely, you’ll simply see an image of yourself-and whatever lies behind you.
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