摘要
采用光线投射法对连续CT图片进行三维重建,针对传统的光线投射法采样点计算量大,难以实现交互的问题,在采样过程中,利用平行投射直线之间的空间递推关系,提出了快速计算射线与平面集合的交点的算法,加快采样点的获取速度,实现重建速度上的提高。针对光线计算重复的问题,采用简化后的Phong光照模型,使得最后重建的显示效果更加理想。通过一台带有独立显卡的PC机,实现了改进后的算法,验证了该算法的实际效用。
Ray casting algorithm is adapted to reconstruct the continuous CT images to three-dimensional. Aimed at the shortcoming that computation of traditional sampling-points method is overlarge and hardly to interact, an algorithm that takes advantage of the recurrence relation of parallel projection line during the sampling process is presented to improve the speed of obtaining the sampling-points and the speed of reconstruction. To avoid the reiteration of ray calculation, a simplified Phong illumination model is used to make the display quality better. This improvement of this algorithm is achieved on a PC, which has a separate graphics card. The effect of this algorithm is proven.
出处
《计算机工程与设计》
CSCD
北大核心
2011年第11期3780-3783,共4页
Computer Engineering and Design
基金
重庆邮电大学自然科学基金项目(A2009-58
T3012198)
关键词
三维重建
光线投射法
采样点
体素
三线性插值
PHONG光照模型
three-dimensional reconstruction
ray casting
sampling-point
volume
trilinear interpolation
Phong illumination model
