Abstract: In order to reduce the number of triangular patches in surface rendering, save space and improve reconstruction results, a contour connecting method based on interzone line was proposed in this paper. This connecting method needed to resample with angle and generate secondary resampling points with geometric methods. And resampling points corresponded with each other. Tissue surfaces were reconstructed with quadrilateral patches and 3D reconstruction was realized. In experimental simulation, a series of head CT images were researched. The simulation analysis shows that to resample the contour line and use quadrilateral patches instead of triangular ones, the number of patches is reduced and the storage space is saved. The reconstruction time is short and the reconstruction efficiency is high.

Key words: surface rendering, resampling, contour connecting

摘要： 为了减少面绘制中三角面片数量,节省空间,提高重建效果,提出了经纬线连接法。该方法利用夹角对轮廓线进行重采样,并用等比法生成辅助采样点,实现采样点一一对应,连接采样点形成四角面片来组成物体表面,实现三维重建。以一组头部CT图像为研究对象进行实验仿真,仿真分析表明对轮廓线进行重采样,用四边形代替三角形,减少了面片数量,节省了存储空间,重建时间较短,重建效率较高。

关键词: 面绘制, 重采样, 轮廓连接