基于EM算法的眼底OCT图像反卷积去模糊技术  

Deblurring Techniques Combined with Deconvolution of OCT Retinal Image Based on Expectation Maximization

作　　者：闫芳 宋双 连剑 任衍具[2] 尹义龙[3] 郑元杰[1] Yan Fang;Song Shuang;Lian Jian;Ren Yanju;Yin Yilong;Zheng Yuanjie(School of Information Science and Engineering,Shandong Normal University,Jinan,250014,China;School of Psychology,Shandong Normal University,Jinan,250014,China;School of Computer Science and Technology,Shandong University,Jinan,250100,China)

机构地区：[1]山东师范大学信息科学与工程学院,济南250014 [2]山东师范大学心理学院,济南250014 [3]山东大学计算机科学与技术学院,济南250100

出　　处：《数据采集与处理》2018年第2期299-305,共7页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金(61572300)资助项目;山东省自然科学基金(ZR2014FM001)资助项目;山东省人民政府泰山学者科研基金(TSHW201502038)资助项目

摘　　要：光学相干层析成像技术(Optical coherence tomography,OCT)在视网膜检查中十分重要,然而在获取OCT图像时眼球运动或者散焦作用都可能引起图像的模糊,从而为临床诊断造成困难。因此,从模糊OCT图像中恢复出清晰图像的去模糊技术研究至关重要。本文结合OCT成像原理,提出了一种基于最大期望(Expectation-maximization,EM)算法的OCT图像反卷积技术。该技术能够在一定程度上抑制OCT模糊图像中异常值对复原图像的干扰,从而有效去除OCT图像中的模糊。将本文技术与多种现有广义图像去模糊技术进行了实验比较,结果表明本文提出的复原OCT图像的反卷积算法在眼底OCT图像去模糊的细节恢复方面效果较好。Optical coherence tomography(OCT)plays a very important role in retinal/choroidal examination.However,image blurring can be introduced into the OCT images during the image acquirement process,resulted from the movement of eye or the out-of-focus effect of the imaging machine.Therefore,OCT image deblurring is of great importance in practice.In this paper,we use an expectation-maximization(EM)based image deconvolution technique for eliminating the blur effect in the OCT images.The proposed technique is designed based on several of the special characteristics of the OCT retinal image and is validated to be able to outperform various state-of-the-art image deblurring techniques as shown by the experimental results in the paper.

关 键 词：图像处理 光学相干层析成像(OCT) 图像去模糊 最大期望(EM)算法 眼底图像 

分 类 号：TN911[电子电信—通信与信息系统]