中文摘要：

以类球型小行星模型数据为基础，提出一种球面窗口扫描与等值线分析相结合的撞击坑自动提取方法。首先，在极坐标系中建立小行星模型，设置方形球面窗口并映射模型数据；其次，在基本面上优化局部形貌信息，提取并分析其等值线，确定区域内的撞击坑特征；再以环带滚轮旋转、窗口横向扫描的方式获取整个小行星模型的撞击坑特征；最后，将所提取的撞击坑特征信息统一至小行星模型中。以Mimas和Dione小行星模型为例，实验结果表明该方法能够稳定、准确地提取模型表面的撞击坑特征，分析其表面撞击坑的分布情况，进一步说明其具有一定的实用性。

英文摘要：

In this paper, a method for automatic extraction of impact craters is proposed by combining with spherical window scanning and contour analysis for similar-spherical asteroid model. First of all, the asteroid model is constructed in the polar coordinate system, the square spherical window is set and the corresponding model data is mapped. Secondly, local shape information on the basic curved surface, the contour lines are extracted and analyzed to identify the impact craters from local area. Then the way combined band rotation with window scanning is applied to obtain all the craters from whole asteroid model. Finally, all the extracted crater feature information are unitized into the asteroid model. Taking the topography models of Mimas and Dione asteroid as examples, the experimental results show that the method can be used to extract the craters steadily and accurately, and to analyze the distribution of craters on the surface.