基于图像处理技术的高鲁棒性角膜曲率测量方法  

A highly robust corneal curvature measurement method based on image processing technology

作　　者：黄铭斌 陈隆 黄沃杰 郑伊玫 丁文正 HUANG Ming-bin;CHEN Long;HUANG Wo-jie;ZHENG Yi-mei;DING Wen-zheng(School of Mechatronic Engineering and Automation,Foshan University,Foshan 528225,China;School of Physics and Optoelectronic Engineering,Foshan University,Foshan 528225,China)

机构地区：[1]佛山科学技术学院机电工程与自动化学院,广东佛山528225 [2]佛山科学技术学院物理与光电工程学院,广东佛山528225

出　　处：《佛山科学技术学院学报（自然科学版）》2022年第4期58-65,共8页Journal of Foshan University(Natural Science Edition)

基　　金：广东省大学生创新创业训练计划资助项目(S202111847099);佛山科学技术学院学生学术基金资助项目(xsjj202105kjb14);广东省大学生科技创新培养专项资金资助项目(pdjh2022b0544)。

摘　　要：为了解决现有角膜曲率测量方法的低适应性问题,提出了一种新的人眼角膜图像处理方法。首先,对相机接收到的角膜图像进行归一化处理,通过阈值化处理与闭运算提取出只含角膜瞳孔区域的二值化图像;然后,利用大津法Otsu二值化对原始角膜图像进行处理,减去瞳孔外部的最大连通区域,利用所得二值化图像与只含瞳孔区域的图像求积,提取出靶环的像,滤除图像噪点对靶环拟合的干扰;最后,实现系统对靶环的拟合,获得高精度的角膜曲率半径。实验结果表明,该方法可以很好地滤除图像噪点,精确地提取出靶环特征,具有较高的鲁棒性,系统测量的角膜曲率精度达±2μm。This paper proposes a new image processing method,which realizes a highly robust corneal curvature measurement system by processing the corneal images collected by the corneal curvature measurement system.This method is to normalize the corneal image received by the camera,and extract the binarized image containing only the corneal pupil area through thresholding and closing operations;then use Otsu’s Otsu binarization to process the original corneal image,subtract the maximum connected area outside the pupil,and then use the resulting binarized image to multiply the image with only the pupil area to extract the image of the target ring and filter out the interference of image noise on the target ring fitting.Finally,the system can fit the target ring and obtain high-precision corneal curvature radius.The processing results show that this method can more completely filter out the image noise,accurately extract the target ring features,and has high robustness,and the accuracy of the corneal curvature measured by the system can reach±2μm.

关 键 词：角膜曲率测量 图像处理 特征提取 大津法Ostu二值化 高鲁棒性 

分 类 号：TN911.73[电子电信—通信与信息系统] R318[电子电信—信息与通信工程]