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Development of head-free remote eye gaze detection system

无头远程眼球注视检测系统的开发

基本信息

批准号：
14550415
负责人：
EBISAWA Yoshinobu
金额：
$ 1.86万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550415/
关键词：
eye gaze detection ultrasonic distance measurement real time image processing remote detection pupil detection head motion detection stereo camera infrared light 視線検出頭部運動追尾超音波距離計測画像処理ズーム・フォーカス制御

项目摘要

Studies for development of non-contact, remote video-based, high-precision eye-gaze detection systems in which users can move their head around 10 cm were conducted for information input into a computer using light of sight. In the principle of the final eye gaze detection system, the precise 3-D pupil position was detected by two stereo wide cameras which can grab whole image of users' face. Another narrow camera fixed on a pan-tilt unit was directed toward user's eye, and grabbed a magnified eye image. In the image, the center of the pupil image and the center of the corneal reflection of the light source were detected. Using their relative positions, the angle of the light of sight relative to the light axis of the narrow camera was determined. The intersection between the light of sight and the visual object was detected as the eye gaze point.Until 2003 fiscal year, the infrared LEDs were arranged in a ring shape around the aperture of each of the stereo cameras. The two rings of t … More he LEDs were switched on synchronously with an odd/even signal of the video and, the pupil and dark pupil images were alternately obtained in each camera. Diffentiating these images eased pupil detection. The 3D positions of the pupil was calculated and the narrow camera was made to direct toward the pupil. On the narrow camera, the rings of LEDs having a different wavelength from that of the stereo wide cameras were attached to near the aperture and a little far from there, and the pupil was detected in the same fashion, and the carnal reflection was detected in the bright eye image.In 2004 fiscal year, an eye gaze calibration method was proposed, which utilized an assumption that the optics of eye ball has a shape of axial symmetry around the visual axis of the eyeball. This could easily calibrate eye gaze point by just looking at one known point on a PC screen and the narrow camera. The experimental results indicated that the detected eye gaze points showed the systematic errors in some positions of the screen. However, the change of the distance between the screen and the face of the subject did not influence the eye gaze detection results. This result showed the efibctiveness of this eye gaze detection method. In addition, it was difficult to estimate the pupil center in the image obtained from the narrow camera when the oarneal reflection was located at the edge of the pupil. The improvement of this problem made the dispersion of the eye gaze point on the screen less than 1.5 cm. Less

研究人员开发了一种非接触式、远程视频、高精度的眼球注视检测系统，在这种系统中，用户可以将头部移动约10厘米，利用视觉将信息输入计算机。在最终眼球注视检测系统的原理中，通过两个立体广角摄像头来检测精确的三维瞳孔位置，该摄像头可以抓取用户面部的整个图像。另一个固定在平移装置上的窄摄像头直接对准用户的眼睛，并捕捉到放大的眼睛图像。在图像中，检测瞳孔图像的中心和光源的角膜反射中心。利用它们的相对位置，确定了瞄准光相对于窄相机光轴的角度。视光与视觉物体的交点被检测为眼睛注视点。直到2003财政年度，红外led都是在每台立体相机的光圈周围排成环形。随着视频的奇/偶信号同步点亮，每台摄像机交替获得瞳孔和暗瞳孔图像。区分这些图像简化了瞳孔检测。计算瞳孔的三维位置，使窄摄像头对准瞳孔。在窄摄像头上，与立体宽摄像头波长不同的led环附着在靠近光圈的地方和稍远的地方，以同样的方式检测瞳孔，在明亮的眼睛图像中检测到肉体反射。2004财年，提出了一种人眼注视标定方法，该方法假设眼球的光学元件围绕眼球视觉轴呈轴对称形状。这可以很容易地校准眼睛的注视点，只要看着一个已知的点在PC屏幕上和狭窄的相机。实验结果表明，检测到的眼球注视点在屏幕的某些位置存在系统误差。然而，屏幕与受试者面部之间距离的变化并不影响眼睛注视检测结果。实验结果表明了该方法的有效性。此外，当耳膜反射位于瞳孔边缘时，在窄相机获得的图像中很难估计瞳孔中心。这一问题的改善使得眼睛注视点在屏幕上的分散小于1.5 cm。少