Study on eye gaze estimation
Study on eye gaze estimation
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DOI：
10.1109/tsmcb.2002.999809
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发表时间：
2002-06-01
影响因子：
--
通讯作者：
Sung, E
中科院分区：
文献类型：
--
作者：
Wang, JG;Sung, E
人类视觉视线有两个组成部分：人类头部的姿势和眼睛在眼窝内的方向。我们已经研究了这两个方面，但本文将重点关注眼睛注视估计。我们提出了一种称为“单圆”算法的新颖方法，用于使用仅放大人的一只眼睛的单眼图像来测量眼睛注视。观察到虹膜轮廓是一个圆圈，我们从椭圆图像中估计出虹膜圆圈的法线方向，即眼睛的注视方向。从基本的射影几何中，椭圆可以反投影到空间中两个不同方向的圆上。然而，通过使用几何约束，即眼球中心和两个眼角之间的距离应该彼此相等，可以消除正确解的歧义。这使我们能够使用变焦相机获得更高分辨率的虹膜图像，从而实现更高的估计精度。还提出了一种将头部姿势确定与眼睛注视估计相结合的通用方法。眼睛注视的搜索由头部姿势信息引导。我们的注视确定方法的稳健性通过对合成和真实图像数据的大量实验进行了统计验证。本文的两个关键贡献是，我们展示了从一只眼睛的单个图像中找到独特的眼睛注视方向的可能性，并且因此可以获得更好的准确性。
There are two components to the human visual line-of-sight: pose of human head and the orientation of the eye within their sockets. We have investigated these two aspects but will concentrate on the eye gaze estimation in this paper. We present a novel approach called the "one-circle" algorithm for measuring the eye gaze using a monocular image that zooms in on only one eye of a person. Observing that the iris contour is a circle, we estimate the normal direction of this iris circle, considered as the eye gaze, from its elliptical image. From basic projective geometry, an ellipse can be back-projected into space onto two circles of different orientations. However, by using a geometric constraint, namely, that the distance between the eyeball's center and the two eye corners should be equal to each other, the correct solution can be disambiguated. This allows us to obtain a higher resolution image of the iris with a zoom-in camera, thereby achieving higher accuracies in the estimation. A general approach that combines head pose determination with eye gaze estimation is also proposed. The searching of the eye gaze is guided by the head pose information. The robustness of our gaze determination approach was verified statistically by the extensive experiments on synthetic and real image data. The two key contributions in this paper are that we show the possibility of finding the unique eye gaze direction from a single image of one eye and that one can obtain better accuracy as a consequence of this.