基于Shear-Warp的加速透视体绘制算法  

An Accelerating Perspective Volume Rendering Method Based on Shear-Warp

作　　者：李彬[1] 田联房[1] 陈萍[2] 王立非[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]广州医学院第一附属医院核医学科,广州510120 [3]广州中医药大学祈福医院影像中心,广州511495

出　　处：《中国生物医学工程学报》2007年第1期54-59,共6页Chinese Journal of Biomedical Engineering

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

摘　　要：在医学图像的三维可视化中,不透明度传递函数和观察角度是需要频繁调节的,因此,难以实现实时体绘制。为了提高三维图像的视觉效果和重建效率,提出了一种加速的透视体绘制算法。依据不透明度传递函数的相关性对原有的min-max octree数据结构进行有效的再利用,从而加速体数据分类编码,以使在频繁改变不透明度传递函数和观察角度时,也能实现快速重建;基于透视Shear-Warp算法,并用即时中间切片插值重采样的方法,提高重建的效果。实验证明该方法不仅效率高,而且显示效果好。In the visualization of 3D medical images, it is common to adjust the opacity transfer function and viewing angle frequently so that volume rendering is difficult to be realized in real-time. In order to enhance the visualization effect and reconstruction efficiency of 3D medical images, a novel speedy perspective volume rendering method based on Shear-Warp method is proposed in this paper. Based on the correlation of the opacity transfer function, the original min-max octree data structure is re-used to carry out rapid classification encoding, thus rapid reconstruction can be realized even under the condition that the opacity transfer function and viewing angle are frequently changed. On the basis of Shear-Warp method, intermediate slice interpolation method is used to improve the effect of reconstruction. Experiments demonstrate the good performance of the proposed method.

关 键 词：透视 体绘制 SHEAR-WARP 医学图像 

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]