期刊论文

Automatic Focusing Algorithm of Pupil Image in Large Field of View

中文

天津师范大学学报(自然科学版)

1671-1114

2007

27

4

63-66

10.3969/j.issn.1671-1114.2007.04.016

天津市高等学校科技发展基金项目（20051017）； 中国民航大学基金项目（05yk26s）；

本校为其他机构

由于视线追踪系统对捕获的瞳孔图像的质量要求很高,而这对瞳孔的精确聚焦又非常重要,为此,首次提出了一种在大视场及光圈、焦距未确定条件下的自动聚焦算法.依据图像灰度信息控制光圈,依据图像中光斑信息调整焦距并实现眼睛定位,使用FSWM算子实现自动聚焦.系统能够在不同光强条件及大小视场情况下实现自动聚焦.实验表明,在不同光照条件及用户不同使用位置的情况下,通过自适应调节,可获得清晰的瞳孔图像.

The precisely focusing of pupil is very important because the gaze tracking system need a high-quality pupil image. An automatic focusing algorithm in large field of view with uncertain aperture and focus is presented firstly. The automatic focusing is realized by using FSWM operator, controlling the aperture according to the information of grayscale of the image and adjusting the focus according to the information of facula of the image. In the condition of large or small field of view the automatic focusing can be realized in different light intensity. The experiments show that the clear pup...