Anti-aliasing technique for surface reconstruction of confocal data
-
摘要: 用边界体素的集合表示物体表面,将边界体素作为点投影到屏幕上形成光照图像时,可能出现空洞和图像走样.改进了体素表面算法:用剖分立方体算法得到物体的边界体素集,然后用边界体素的中心点构造投影表面点,用脚印函数计算表面点对显示图像平面上像素的影响范围,以此值作为该像素的权值,形成最后的图像.这样,边界体素不是只投影到一个点上,而是有一个投影区域,从而避免空洞现象,并减轻走样现象.实验证明,该方法具有较快的表面重建速度,消除了空洞,改善了显示效果.Abstract: There might exists missing holes and aliasing on the projected image by way of representing object surface with boundary voxels and projecting boundary voxels to the screen as points to render the shading image of the object. An anti-aliasing technique for surface reconstruction is proposed. Firstly, the boundary voxel sets is generated by dividing cubes; Secondly, the values of the center point of the boundary voxel sets is obtained to form the surface point sets; Then, a footprint function is chosen to calculate the effect region of the surface point on the pixel on the screen, and the result value is used as the weight of the pixel. This processing is just like splatting, so the missing holes is eliminated and the display quality is improved. Experimental results show that both the surface reconstruction and the display performance of the technique are satisfactory.
-
Key words:
- confocal imaging /
- surface reconstruction /
- anti-aliasing /
- dividing cubes algorithm
-
[1] Gu Min. Principles of three-dimensional imaging in confocal microscopes[M] World Scientific Pub Co, 1996 [2] Lorensen W E, Cline H E. Marching cubes:a high resolution 3D surface construction algorithm [J] Computer Graphics, 1987, 21(4):163~169 [3] Cline H E, Lorensen W E, Ludke S. Two algorithms for the three-dimensional reconstruction of tomograms [J] Medical Physics, 1988, 15(3):320~327 [4] Pfister H, Zwicker M. Surfels:surface elements as rendering primitives . Proceedings of SIGGRAPH 2000 . New Orleans, USA, 2000.335~342 [5] Zwicker M, Pauly M, Knoll O, et al. Pointshop 3D:an interactive system for point-based surface editing . Proceedings of SIGGRAPH 2002 . San Antonio, USA,2002.322~329 [6] Alexa M, Behr J. Computing and rendering point set surfaces[J] IEEE Transactions on Computer Graphics and Visualization, 2003, 9(1):3~15 [7] Dzik S, Ezrieley J. Representing surfaces with voxels[J] Computer & Graphics, 1992, 16(3):295~301 [8] 吴良武. 体素建模、绘制及其在医学图像中的应用 .大连:大连理工大学机械工程学院,2001.54~63 Wu Liangwu. Modeling and rendering of voxel and their application in medical images . Dalian:School of Mechanical Engineering, Dalian University of Technology, 2001.54~63(in Chinese) [9] Westover L. Footprint evaluation for volume rendering[J] Computer Graphics, 1990, 24(4):367~376
点击查看大图
计量
- 文章访问数: 2491
- HTML全文浏览量: 94
- PDF下载量: 1193
- 被引次数: 0