Detection of Gaze Direction by Using Improved Eye-Tracking Technique

Among the various techniques used for the detection of gaze direction, the procedure based on determining pupil or iris position using video camera connected to a computer deserves special attention. Gaze follows the movement of an item - "a target point" on the PC screen, the video camera captures the images of the eye and the PC determines the gaze position; this appears as "a map" on which the positions detected show as points around the target point. It is essential for the result to consist in a stable image or a map for gaze direction to be recognized by the PC. This paper presents a procedure for achieving stable cursor movement using low-pass filtering. It discusses the design, achievement and test results of a digital low-pass filter used in order to ensure the stableness of the point on the map that corresponds to gaze direction.