关键词: 圆检测, 瞳孔检测, 中心定位, 霍夫变换, 暗瞳

Abstract: Eye movement is an important approach to get and promulgate the information of brain.In recent years，most researches are to model eyeball as a circle or an ellipse，to use Hough transform detect it，for locating the pupil center.For the traditional Hough transform（including random Hough transform） has a poor fristgerecht，in order to get more accurated eyemove information，the rate of frames gathering usually has to be over 100 f/s.So，by the special features of dark pupils and approximate circle of pupil，this thesis uses Video Oculographic（VOC） to gather the images，improves the traditional Hough transform，extracts the edge of pupil binary image，chooses three points on the boundary to get a parameter set，and replaces the traditional voting method with the mathematic expectation，calculates the mathematic expectation to get the center of pupil.The experiment proves that the method is feasible，accurate and stable.

Key words: circle detecting, pupil detection, center locating, Hough transform, dark pupil