A new scattering enhancement scheme for polarimetric SAR images based on covariance matrix

摘要

A new scattering mechanism enhancement scheme has been developed for natural targets based on the eigenvalues and eigenvectors of the covariance matrix in order to identify different scattering events. First, three new vectors were constructed by the eigenvectors of the covariance matrix with some modifications. Then, those modified vectors were weighted by the normalized eigenvalues of the covariance matrix as a weighting function. Thus, three vertices could be obtained in the three-dimensional space. In order to utilize them equally, a triangle was constructed by connecting these three vertices. The shape of the triangle may be changed due to the different scattering mechanisms because the vertices are obtained from the combination of eigenvalues and eigenvectors. The result indicated that different scattering mechanisms can be represented by using an exterior angle which derived from the interior angles of the triangle.