CAJ | 학술논문

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.
위료득도진실적수니과립초시수화연화모형,제출일충기우륜곽적중구방법화다층차단원분해(MPU)중구방법상결합적수니과립중구방법.수선인입권중함수장제취륜곽적측지선/궤하동태륜곽모형화무변연동태륜곽모형결합도일기,이용동태륜곽모형쾌속전국최소화방법제취과립륜곽,병채용최대류간방차구출변연역치,제취출수니과립정학적변연륜곽선;연후사용평면의합방법장기전화위대유"법시"적삼유공간점;최후채용개진적MPU방법중구출광순적삼유수니과립.실험결과표명,문중방법비목전수니재료영역이유적중구방법간단역행,중구효과이상.
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.