【作者】 宋亮；

【导师】 耿国华；

【作者基本信息】 西北大学 ， 计算机软件与理论， 2009， 硕士

【摘要】 颅面形态学通过研究找出人的颅骨和面貌之间的形态关系,为颅骨面貌复原提供科学依据,近年来这方面的研究受到了广泛的关注和重视。本文针对颅面信息提取与三维重建展开研究,以人体脑部CT图象作为样本数据,实现了CT图象的预处理、分割及轮廓线提取,为快速重建三维模型提供了良好基础。本文研究工作主要包括:(1)提出了一种剔除CT图象中冗余影象的方法,该方法结合图像分割与轮廓跟踪,在获得面皮轮廓线的同时能够自动进行冗余影像的剔除,实验表明该算法速度快,剔除效果好,能够实现大量CT数据的批处理。(2)利用遗传算法得到了吉布斯分布的参数估计,结合最大后验概率准则,提出了GA-MRF-MAP分割算法。与现有的几种CT图象分割算法相比,应用GA-MRF-MAP算法得到的分割结果区域一致性好,正确率高,并实现了无监督分割。(3)在梯度算子与四邻域法的基础上提出了射线扫射法与坐标法,只提取骨骼的最外层轮廓线,避免了多余轮廓线造成的数据存储及重建压力。(4)使用基于轮廓线的表面重建方法对颅骨和人脸进行三维模型重建,得到了无厚度的颅骨模型。以Visual C++ 6.0为主要开发工具,结合VTK开发包,设计实现了对CT图象处理及三维重建的系统“CTManageSys”,该系统为颅面信息后处理提供了基础平台。更多还原

【Abstract】 Skull-face morphology research is to find the morphologic relationship between the skull and face, it provides a scientific foundation for the skull-face reversion research, the two researches have been paid wide attention these years. This paper does researches on skull-face information extraction and 3D reconstruction, it has realized CT preprocessing, segmentation and contour track based on CT images, providing a better base for fleetly 3D reconstruction. The work in this paper mainly include:(1)Proposes a new method which combines contour track and segmentation together to clear the redundancy in CT images, the method could extract the face’s contour, at the same time, it could automaticly remove the redundancy in CT images. The method is proved fast and good by experiments and it has application value.(2)Gets the estimation of Gibbs parameter through the genetic algorithm, combines the maximum a posteriori probability rule, proposes a segmentation algorithm called GA-MRF-MAP. Comparing with some existed segmentation algorithm, GA-MRF-MAP algorithm is consistent, accurate, and it is an unsupervised method .(3)Based on the method of Tidusuzi and Silinyu, this paper proposes the other two methods: line scanning method and coordinate judgement method , the two methods only extract the outer contours of skull, they avoid the pressure from data store and 3D construction.(4)Gets single-layer 3D models of face and skull through the surface reconstruction method.Designed a system called "CTManageSys" to dull with CT images and to make 3D reconstruction, this system is a basic flat for later researches.更多还原