Visual spectrum only: no benefit from near-infrared spectrum light (which allows the algorithm to accurately detect the pupil against the surrounding iris).Webcams, or consumer application cameras, are tuned for the visual spectrum and that poses some limits: Visual spectrum, resolution, and contrast This is because we only really need or want a webcam that operates with visible spectrum light – video conferencing in near-infrared spectrum light would be a peculiar experience. To begin with, webcam eye tracking essentially means getting eye tracking data from a “normal” camera – a camera that only detects light in the visible spectrum. Webcam eye tracking has none of these benefits. The typical eye tracker is a dedicated piece of camera hardware designed and optimized for capturing eye movement in any lighting condition, and can compensate for head movement, and a wide range physiological variation of the eye region. In this post we will dig into the world of dedicated eye tracking hardware and webcam-based eye tracking and potentially what the future holds. However other options have begun to emerge and we believe in always providing the full image. These features work together to create a highly accurate system for eye tracking. State-of the-art eye tracking utilizes high performance industry cameras that detect near-infrared spectrum light, and also benefit from active illumination in that spectrum.
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