结合SIFT变换与Otsu匹配的彩色眼底图像拼接方法  

Color fundus image mosaic method based on SIFT and Otsu matching

作　　者：张欣鹏[1] 杜伟强[1] 肖志涛[1] 张芳[1] 耿磊[1] 吴骏[1] 苏龙[2] ZHANG Xinpeng;DU Weiqiang;XIAO Zhitao;ZHANG Fang;GENG Lei;WU Jun;SU Long(School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin 300387, China;The Second Hospital of Tianjin Medical University, Tianjin 300211, China)

机构地区：[1]天津工业大学电子与信息工程学院,天津300387 [2]天津医科大学第二医院,天津300211

出　　处：《计算机工程与应用》2017年第18期176-181,249,共7页Computer Engineering and Applications

基　　金：天津市科技支撑计划重点项目(No.13ZCZDGX02100);天津市应用基础与前沿技术研究计划一般项目(No.15JCYBJC16600)

摘　　要：针对多幅单模彩色眼底图像的拼接问题,提出一种基于尺度不变特征变换(Scale Invariant Feature Transform,SIFT)与最大类间方差(Otsu)匹配的拼接方法。为克服光照不均对特征提取造成的影响,采用SIFT变换提取眼底图像特征点;利用Otsu剔除误匹配点,提高特征点的匹配精度;在此基础上,计算匹配点对之间的仿射变换矩阵,进行图像空间变换实现图像配准,并对配准图像进行融合。结果表明,提出的方法可实现对多幅单模彩色眼底图像的高精度自动拼接,具有很强的鲁棒性。A new mosaic method is proposed using Scale Invariant Feature Transform(SIFT)and Otsu matching for singlemodefundus images.SIFT features are extracted for fundus images to overcome the influences of uneven illumination.Otsu algorithm is utilized to remove false matching points for improving the accuracy of feature matching.Then,thematrix of affine transformation is calculated among the matching points to complete image registration by space transformation.Finally,the registrated images are fused.The experiment results show that the proposed method is robust and canachieve high precision automatic single-mode fundus images mosaic.

关 键 词：彩色眼底图像 图像拼接 SIFT特征 Otsu匹配 图像融合 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]