For the speckle depressing , we develop a multi - description model to describe the fundamental properties of the sar images . different models are used to describe different type of regions in sar images . these models include the homogeneous region model and the non - homogeneous region model , and the later consists of the strong scatterer model , the line - like region model and the weak edge region model 在sar图像相干斑抑制方面,建立了一种针对相干斑抑制的sar图像多描述模型,用不同模型描述sar图像中不同类型区域,涉及到平稳区域模型和非平稳区域模型,非平稳区域模型又细分为强散射中心模型、线状区域模型和弱边缘区域模型等。