一种用于半透明体绘制的光学模型  

An Optical Model for Translucent Volume Rendering

作　　者：李彬[1] 田联房[1] 王立非[2] 陈萍[3] 毛宗源[1] 

机构地区：[1]华南理工大学自动化科学与工程学院,广州510640 [2]广州中医药大学祈福医院影像中心,广州511495 [3]广州医学院第一附属医院核医学科,广州510120

出　　处：《中国图象图形学报》2008年第2期322-327,共6页Journal of Image and Graphics

基　　金：国家自然科学基金项目(30570458);广东省自然科学基金项目(05006530);广州市番禺区科技攻关项目(2005-Z-55-1)

摘　　要：为了高效率地重建3维医学图像,并能充分显示内部隐含分界面及内部细节的详细信息,提出了一种能在普通硬件条件下实现的用于半透明体绘制的光学模型IVROM(improved volume rendering optical model)。该模型在光线吸收与发射模型的基础上,考虑了阴影、直接散射与间接散射等因素。此外,还详细介绍了结合该模型与Shear-Warp算法的半透明体绘制方法的实现。实验结果表明,采用该模型的半透明体绘制方法不仅效率高,而且显示效果好。In order to efficiently reconstruct 3D medical image and clearly display the detailed information of inner structures and the inner hidden interfaces between different mediums, an improved volume rendering optical model （IVROM） for translucent volume rendering is proposed, which can be easily realized on a general PC. On the basis of classic absorption and emission model, the effects .of volumetric shadows, direct and indirect scattering are also considered in the proposed model Moreover, the implementation of the translucent volume rendering method incorporating the IVROM model and Shear-Warp is described detail. Experiments demonstrate the good performance of the proposed method.

关 键 词：光学模型 Shear—Warp 医学图像 半透明体绘制 明暗化 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术] R319[自动化与计算机技术—计算机科学与技术]