玉米叶片形态建模与网格简化算法研究  

Maize Leaf Morphological Modeling and Mesh Simplification of Surface

作　　者：肖伯祥[1,2] 郭新宇[1] 王纪华 郑文刚[1] 王丹虹[3] 

机构地区：[1]国家农业信息化工程技术研究中心 [2]大连理工大学计算机技术研究所大连116024 [3]大连理工大学计算机技术研究所

出　　处：《中国农业科学》2007年第4期693-697,共5页Scientia Agricultura Sinica

基　　金：国家"863"计划课题(2003AA209020);北京市自然科学基金项目(4032011)

摘　　要：【目的】协调禾本科作物形态模型的可视化效果和计算效率之间的关系。【方法】提出一种利用非均匀有理B样条(NURBS)插值结合使用多直线段分裂算法(splitting)来重建玉米叶片三维形态并实现曲面网格简化控制的方法。【结果】该方法利用三维数字化仪采集的数据点,通过计算节点矢量、差值计算反求曲面控制点等步骤构造出玉米叶片曲面,具有较强地真实感效果;根据叶片形态特征,采用多直线段分裂算法的逆运算来对叶片曲面网格数量进行简化,在尽可能保持曲面特征的同时可显著降低网格数目。【结论】应用该方法进行玉米冠层可视化与光分布计算,结果表明,在不显著增大计算误差的前提下,可以明显地提高计算效率。[Objective] The study was conducted to harmonize the relationship between visual effects and calculation efficiency of crop morphological models. [Method] This was done using morphological modeling of maize leaves based on Non-Uniform Rational B-Splines （Nurbs） interpolation combined with multi-line segment splitting algorithms. Controllable mesh simplification of triangular surface was introduced. [Results] Scientists used a group of three-dimensional data points from a scanning device. The crop leaf crooked surface with a 3D effect was constructed using a vector calculation. Crooked surface control points resulted by useing interpolation calculation, etc. According to leaf morphological characteristic, leaf surface mesh amount was simplified by inverse operations of multi-line segment splitting algorithm, and the mesh amount declined with available maintenance of surface characteristics. [Conclusion] This method was used to calculate visualization and light distribution and the results showed that calculation effects could be improved clearly when a calculation error was not increased remarkably. The method could reflect model details and provide the solution to harmonize the relationship between visual effects and calculation efficiency of crop morphological models.

关 键 词：玉米叶片 NURBS 形态建模 网格简化 光分布计算 

分 类 号：S513[农业科学—作物学]