中文摘要：

为了得到真实的水泥颗粒初始水化演化模型,提出一种基于轮廓的重构方法和多层次单元分解（MPU）重构方法相结合的水泥颗粒重构方法.首先引入权重函数将提取轮廓的测地线/几何动态轮廓模型和无边缘动态轮廓模型结合到一起,利用动态轮廓模型快速全局最小化方法提取颗粒轮廓,并采用最大类间方差求出边缘阈值,提取出水泥颗粒精确的边缘轮廓线 然后使用平面拟合方法将其转化为带有＂法矢＂的三维空间点 最后采用改进的MPU方法重构出光顺的三维水泥颗粒.实验结果表明,文中方法比目前水泥材料领域已有的重构方法简单易行,重构效果理想.

英文摘要：

In order to obtain the real initial hydration model of cement particles,a novel shape reconstruction approach of cement particles,which integrates methods of slices-based reconstruction and multi-level partitioning of unity（MPU） implicit model,is presented.It combines the geodesic/geometric active contour（GAC） model and the active contour without edges（ACWE） model with a weight function to extract the raw contours of cement particles from a series of sample grey images by global minimization.The accurate particle contours are determined by accounting for the largest grey variance between-different classes.These 2D contours are then converted to 3D points and the normal at each sample point is estimated by plane fitting.The global shape of the 3D cement particles are reconstructed with the improved MPU method.Experimental results show that the proposed approach is not only capable of acquiring more satisfactory reconstruction results compared with other cement material reconstruction methods but also easy to implement.