Structure-driven SAR Image Registration
Yi Yang · Jisuanji fangzhen · 2006
Due to the presence of speckle in SAR image,the existing registration algorithms which are successfully used in optical remote sensing image are usually not applicable to SAR image directly.Based on the idea that human observers could greatly simplify the matching problem at the level of object structure,a structure-driven SAR image automatic registration algorithm was proposed.Firstly,the virtual structures were constructed from the point targets detected from the SAR images;and then they were matched by using the combination of structure invariance and structure region invariant moments.Finally,the LMS algorithm was used to estimate the affine transformation parameters,thus the SAR images could be registered automatically.Practical experimental results show that the proposed new algorithm is not only valid in the automatic registration of SAR images,but also can avoid the influence caused by speckle in feature detection and feature matching process.