ABSTRACT
Rapid scan cameras provide random access to every single line of the sensor. If rapid scan is applied to measure eye movements, it is necessary to analyze the video data online, since the image of the eye on the sensor has to be tracked to always grab those lines of the sensor which cover the pupil. Since the advent of electro-oculography, the recording of eye movements has played an important role in many neurological tests, e.g., the examination of the vestibulo-ocular reflex. Horizontal and vertical eye movements can be measured from an image of the eye by detecting the edges of the pupil and fitting an ellipse to them. The advantages of video-oculography – high accuracy, insignificant artifacts, non-invasiveness, and free head movement of the patient during measurement — are self-evident. Standard video cameras always grab the entire picture projected on their imaging sensors by horizontally scanning the frame line by line from top to bottom.
