一种高效的光线投射体绘制优化算法  

An Efficient Ray Casting Volume Rendering Optimization Algorithm

作　　者：何楠[1] 杜宏伟[1] 

机构地区：[1]中国科学技术大学电子科学与技术系,安徽合肥230026

出　　处：《航天医学与医学工程》2015年第4期265-269,共5页Space Medicine & Medical Engineering

摘　　要：目的针对传统光线投射体绘制算法绘制速度慢,绘制图像有木纹效应的问题,提出一种高效的光线投射体绘制优化算法,消除绘制图像的木纹效应,同时提高体绘制的速度。方法采用预积分分类方法避免采样频率对传递函数的依赖,消除光线投射体绘制产生的木纹效应,利用平行线切割投射光线的数学特性实现高效的插值方法,提高体绘制的速度。利用图像的均方误差MSE和峰值信噪比PSNR评价图像的质量。结果本文的优化算法不但能够消除图像的木纹效应,而且使体绘制速度提高2.4倍以上。结论本文的光线投射体绘制优化算法能抑制图像的木纹效应,得到高质量图像,并且提高体绘制的速度。Objective To improve the slow rendering speed and eliminate wood grain effect in the traditional ray casting volume rendering algorithm, an efficient ray casting volume rendering optimization algorithm was proposed in this paper. Methods The pre-integrated classification was used to avoid the wood grain, caused by sampling frequency depended on transfer functions, of ray casting volume rendering. The mathematical proper- ties of ray through the parallel lines were used to speed up the rendering. The mean square error and peak sig- nal to noise ratio were used to assess the image quality. Results The proposed optimization ray casting volume rendering algorithm could not only eliminate the effect of wood grain and acquire good image quality, but also speed up the ray-casting volume rendering 2.4 times. Conclusion The experiment results demonstrate that the optimization volume rendering algorithm not only acquire good quality image, but also speed up volume rendering.

关 键 词：光线投射 体绘制算法 木纹效应 预积分体绘制 插值 

分 类 号：R445[医药卫生—影像医学与核医学]