Detection of Pupil and Corneal Reflection Using High-speed Camera for Gaze Detection Under Face Intense Illumination and a Solution of Glass Reflection Problem by Improving Light Source
In our pupil-corneal reflection-based gaze detection system, when users move the head quickly, the image difference method for detecting the pupils does not tend to function accurately. In addition, it becomes more difficult to detect the corneal reflection of the near-infrared light source as well as the pupil under face intense illumination condition because the pupils constrict and the disturbance light source, e.g. the sun, is misdetected as the corneal reflection. Moreover, when the users wear glasses, the reflections of glasses tend to be misdetected as the pupil and corneal reflection (feature points). In the present paper, we introduce a high-speed camera (2,000 fps) and propose a new detection method additionally acquiring a non-lighting image and then differentiating the image from the bright and dark images to detect the feature points even under the face intense illumination condition. In addition, a new light source for removing the glass reflections and enhancing the brightness difference between the bright and dark pupils is developed. The experimental results show that the robustness for the detection of the feature points is improved both under the face intense illumination condition and under the glasses-wearing condition.
KeywordsHigh-speed camera Pupil Corneal reflection Intense illumination
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