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The picture on the right shows a prototype system.
The main elements of this system are two infrared
cameras, which are synchronized in hardware in the master-slave
configuration. These cameras are fully calibrated, that is, the position
and orientation of the cameras are known and any pixel can be translated
from the image coordinates to the actual world coordinates.
Infra-red light sources are used for illumination.
Near infra-red spectrum is used in most eye-trackers to reduces
interference with ambient illumination and facilitate image processing.
This system operates in real time at a frame rate
of 30Hz. At each time frame, a stereo pair of images of the subject’s
face is captured. Each pair of images is then analyzed and a PoG
is estimated.
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