| 摘要 |
PURPOSE:To enhance the success probability for detecting the line of sight, and to detect the line of sight with high accuracy by detecting the line of sight again after changing an image output of a reflected image of an eyeball, or changing the detection threshold of a feature point of the reflected image in the case of being unsuccessful in the detection of the line of sight. CONSTITUTION:Whether a Purkinje image and the pupil center position are detected already or not, and when the detection is unsuccessful, when the number of times of the unsuccess for detecting a line of sight is a first time or a second time, whether the unsuccess is caused by the detection of the Purkinje image or not is decided. As a result, when the detection of the Purkinje image is successful, the detection of the pupil center is unsuccessful, and since this case is generally supposed so that the difference of output levels of the pupil and the iris does not reach a threshold V, the level of the iris part is raised by changing a storage time of a CCD-EYE (image sensor) 14, or an amplification characteristic of a sensor output. Also, in the case of being unsuccessful in the detection of the Purkinje image, the position of an infrared emitting diode (IRED) 13 being a light source is changed. |
