基于EM算法和单幅雷达图像阴影的控制点坡度校正

Correction of Control Point Slope Based on EM Algorithm and Shading of Single SAR Image

摘要: 对在我国现有的条件下进行控制点坡度校正的必要性进行了阐述,并分析了EM算法。根据EM算法以及基于区域增长的余弦散射模型建立了控制点坡度校正模型,并用河北省张北地区的雷达影像进行了实验,取得了较高的精度初值。

Abstract: This paper introduces a new algorithm based on EM algorithm to get precise postion and slope. We find the postion of notable geographic characteristic in the SAR image and the contour map. Then the postion of the seed is adjusted. We correct the postion and slope of the seed through iterative computation by cosine backscatter model based on EM algorithm.