基于B样条的云图非刚性配准方法  

Nephogram Nonrigid Registration Method Based on B-spline

作　　者：徐丽燕[1] 陈允杰[1] 邱军[1] 史栋林[1] 夏德深[1] 

机构地区：[1]南京理工大学计算机科学与技术学院,江苏南京210094

出　　处：《测绘学报》2011年第3期326-331,共6页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(60773172);江苏省自然科学基金(BK2008411);教育部博士学科点基金(200802880017)

摘　　要：针对气象卫星分时成像所获得的序列图像同时具有刚性及非刚性形变的特点,提出结合B样条的分级变换模型进行配准。该算法不但考虑到传感器位置变化引起的旋转和平移等整体刚性形变,而且还考虑云的扭曲所引起的局部非刚性形变。对于图像整体刚性形变采用仿射变换配准算法进行校正,使图像整体趋于一致;而云的局部扭曲等非刚性形变采用改进的基于B样条的自由形态变形模型(FFD)非刚性配准算法进行校正。试验结果表明,本算法能够达到亚像素级的配准精度,并且具有较快的运行速度。Serial images obtained by meteorological satellite have both rigid and nonrigid deformations.Due to this characteristic,a hierarchical transformation model of the motion based on B-spline is introduced.The global rigid deformation of the image is mainly caused by the position changes of the sensor,and it includes rotation and shift.Cloud＇s distortion results in the local nonrigid deformation.The global motion of the image is modeled by an affine transformation which carries out the rigid registration.While the local image deformation is described by an improved free-form deformation（FFD） model based on B-spline.The algorithm has been applied to the fully automated registration system of nephograms,and the results clearly indicate that the approach we proposed can not only achieve sub-pixel precision,but also decrease the runtime of the process.

关 键 词：云图 非刚性配准 B样条 FFD模型 归一化互信息 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]