节点文献
人体三维重建的实践和技术研究
Practice and Research on Reconstruction of Human Body
【作者】 陈秦玉;
【导师】 汪国昭;
【作者基本信息】 浙江大学 , 计算机辅助几何设计与图形学, 2004, 博士
【摘要】 本文对人体三维重建技术进行了研究,包括轮廓线表面重建算法、对已分割数据的可见面算法以及对平行轮廓线数据的扫描可见面算法,最后提出了两个新的曲线曲面造型工具一拟Bezier曲线和NUAT B样条曲线。 为了建立人体躯干模型,作者使用了轮廓线表面重建方法。主要对Tiling问题进行了研究,并提出了一个“分而治之”的算法,在很大程度上减轻了因为轮廓线不相似产生的曲面扭曲。同时,利用该算法得到了人体的躯干模型。 由于人体内部器官结构复杂,使用传统的轮廓线表面方法很难进行重建。作者提出了一个新的基于体素的重建算法—可见面算法,该算法实现简单,并且能够获得多个组织的分割面。对平行轮廓线数据,提出了所谓的扫描可见面算法,该算法能从平行轮廓线数据中迅速的重建出形体的三维表面。 最后,作者提出了两类新的曲线曲面造型工具一拟Bezier曲线和NUAT B样条曲线。它们包含传统的Bezier、B样条曲线,并且能够精确的表示圆弧和椭圆。
【Abstract】 This paper summaries our researches on the reconstruction of human body, which includes the modified algorithm based on contour, the visible-face algorithm for segmented data and scanline visible-face algorithm for the data of parallel contours, finally, two modeling tools, Bezier craves and NUAT B-spline curves, are presented for modeling the shape of human organs.For the reconstruction of the human trunk, the method based on contours is used. The tiling problem is discussed mainly and a "divide and conquer" method is presented. This method behaves better in the case of dissimilar contours.Since the complexity of human organ, the reconstruction is difficult to use the above method. A new voxel-based algorithm ,visible-face algorithm, is presented. This algorithm is easy to implement and can be used to obtain the separating surface. For the data of parallel contours, an algorithm named scanline visible-face algorithm is presented.Finally, two modeling tools , Bezier-like curves and NUAT B-spline curves, are presented. They includes the Bezier curves and B-spline curves, and can represent circle and ellipse accurately.
【Key words】 virtual human; visualization; 3D reconstruction; scanline transition; contour-based; cross-section; voxel-based; Bezier curves; B-spline curves; C-B-spline;