测绘学报

• 学术论文 •    

局部单应约束的高精度图像自动配准方法

杨化超1,张磊1,姚国标1,王永波2   

  1. 1. 中国矿业大学
    2. 中国矿业大学环境与测绘学院
  • 收稿日期:2011-03-28 修回日期:2011-05-30 出版日期:2012-06-25 发布日期:2012-06-25
  • 通讯作者: 杨化超

An Automated Image Registration Method with High Accuracy Based on Local Homography Constraint

2, 3, 4   

  • Received:2011-03-28 Revised:2011-05-30 Online:2012-06-25 Published:2012-06-25

摘要: 提出一种基于SIFT特征的鲁棒图像匹配算法。算法分为两个阶段:(1) 初始匹配。综合利用SIFT特征匹配方法和基于SIFT特征尺度和方位信息的自适应归一化互相关(Normalized Cross Correlation, NCC)方法建立初始相关,并基于几何关系一致性检测剔除误匹配;(2) 匹配传播。在初始相关的基础上,利用自适应NCC和局部单应约束进行匹配传播,迭代产生更多的匹配点并采用几何关系一致性检测剔除可能的误匹配。初始单应采用最小二乘匹配方法估计得到,并采用自适应NCC为其提供良好的初始值。与现有的基于SIFT特征的图像配准方法相比,算法在抗几何变形和配准精度等方面具有优越性。

Abstract: This paper proposes a robust image registration algorithm which includes the following two stages: (1) initial matching. SIFT matching method and the normalized cross correlation (NCC) metric modified with adaptive scale and orientation of SIFT features are proposed to find good initial matches, and the geometric consistency check is used to identify false matches; (2) matching propagation. A robust matching propagation using adaptive NCC and local homography constraint starts from the initial correspondences established in the first phase, and the geometrical consistency check is used simultaneously to eliminate the incorrect matches. By using matching propagation, we can get control points used to image registration as many as possible. Initial local homography is estimated using least squares matching algorithm and the initial values of unknown parameters needed for it is provided by adaptive NCC method. Compared to existing point-based image registration methods, the proposed algorithm has better performance in terms of registration accuracy and robustness to geometric deformations within images.