基于投影的视网膜眼底图像视盘检测方法  

Projection Based Optic Disk Detection Method in Retinal Fundus Image

作　　者：张东波[1,2] 易瑶[1] 赵圆圆[1] 

机构地区：[1]湘潭大学信息工程学院,湘潭411105 [2]湘潭大学智能计算与信息处理教育部重点实验室,湘潭411105

出　　处：《中国生物医学工程学报》2013年第4期477-483,共7页Chinese Journal of Biomedical Engineering

基　　金：湖南省教育厅资助科研项目(10B109);湖南省科技厅资助项目(2012FJ3113);湖南省重点学科资助

摘　　要：充分利用血管的分布特性和视盘区域的外观特性,本研究提出一种易于实现的基于一维投影的视盘检测方法。首先利用2倍主血管宽度的垂直窗计算各水平位置的血管散布度值,并绘出相应的水平投影曲线,投影曲线的最小值点被确定为视盘的水平坐标,然后在确定的水平位置,通过边长为视盘直径的矩形窗获取局部区域内的亮度和血管边缘梯度特征,并绘出相应的垂直投影曲线,该曲线最大值点即为视盘垂直坐标。将本方法在4个公开的眼底图像数据集和1个自选数据集上进行了测试,在整个380幅眼底图像中,检测准确率达到94%,在STARE数据库中平均用时13.2 s,综合准确率和效率来看,本方法易于实现,鲁棒性好,符合实际系统处理要求。In order to utilize the vessel distribution and optic disc （OD） appearance characteristics effectively, a novel OD localization method based on 1 - D projection was proposed in this work. First, vertical windows with 2 main vessel widths were used to compute the vascular scatter degree of every horizontal position, and corresponding horizontal projection curve was plotted, the horizontal location of OD was identified as the location of the minimum position of the horizontal projection curve. Next, a rectangular window slid up to down at determined horizontal location to obtain the brightness and edge gradient features of local regions, and corresponding vertical projection curve was plotted. The maximum peak of the vertical projection curve was set as the vertical position of OD. The proposed method was tested with four publicly-available databases and a self- selection database. The OD was successfully located in 357 images out of 380 images （94%）. And the average time for one image in STARE dataset was 13.2 s. Regarding to accuracy and efficiency, the proposed method was easy to implement and present good robust performance.

关 键 词：视盘检测 投影 视网膜图像 

分 类 号：R774.01[医药卫生—眼科]