| 摘要 |
An eye tracking system for monitoring the movement of a user's eye comprises an eye camera (2) and a scene camera (4) for supplying to interlace electronics (6) video data indicative of an image of the user's eye and an image of the scene observed by the user. In addition the system incorporates a frame grabber (8) for digitising the video data and for separating the eye and scene data into two processing channels, and a spot location module (12) for determining from the video data the location of a reference spot formed on the user's eye by illumination of the user's eye by a point source of light. The spot location module (12) includes adaptive threshold sub-module for providing an indication of parts of the image produced by the eye camera (2) which have a brightness greater than a threshold value, and a spot identification sub-module for selecting a valid reference spot by comparing those parts of the image with predetermined validity criteria. The system further incorporates a pupil location module (14) for determining the location of the pupil of the user's eye relative to the reference spot in order to determine the user's line of gaze, and a display for indicating the user's point of regard from the user's line of gaze determined by the pupil and spot location modules. Such an arrangement provides a fast and versatile eye tracking system. |
