三维重建表面任意切面图像提取及映射有效方法  

Effective method for arbitrary image of clip plane extraction and mapping on 3D reconstructed surface

作　　者：傅由甲[1,2] 洪雄[1] 张建勋[1] 杨长辉[1] 

机构地区：[1]重庆理工大学计算机科学与工程学院,重庆400050 [2]重庆大学光电工程学院,重庆400038

出　　处：《计算机应用研究》2009年第9期3548-3549,3565,共3页Application Research of Computers

基　　金：重庆市重大科技攻关项目(CSTC;2006AA1005)

摘　　要：针对三维重建表面模型的任意切面纹理显示,分为3D纹理采样和切面纹理映射两阶段。前者通过模型包围盒及模型横断面轮廓定位纹理部位并去掉图像背景,经采样形成多精度3D纹理;后者先计算剖切平面和模型及纹理空间中包围盒交面,然后利用向量叠加原理及立方体线性插值方法快速提取纹理空间的交面图像,经A lpha测试后映射到模型空间相应切面上,形成具有切面纹理的剖切模型。实验表明,该方法克服了面绘制技术不能体现内部数据的缺点,有效地提高了大数据量模型任意剖切面纹理绘制速度。Focused on the display of the texture on the arbitrary clip plane of 3D reconstructed surface model, this paper pres- ented a two-phase approach to solve the issue, namely, the 3D texture sampling phase and the section texture mapping phase. In the first phase, determined the 3D texture＇ s position and removed its background by the hounding box and the transect out- line of the cutting model, then weaved the multi-precision 3D texture by sampling. In the second phase, computed the inter- secting polygons of cutting plane and the bounding boxes in the model and texture spaces, and the fast abstracted image of the texture space on it using vector superposition principle and cubic linear interpolation. Then mapped the section texture to the clip section in the model space after Alpha testing, thus formed the cutting model with section texture. Experiments show that the proposed method solves the problem that inner data is invisible in surface rendering, and effectively improves the texture rendering speed of arbitrary clip plane.

关 键 词：三维重建 面绘制 3D纹理 任意剖切 纹理映射 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]