[1]高纪青,云挺,薛联凤*. 基于投影算法和活动轮廓模型的真实叶面积指数计算[J].西北林学院学报,2014,29(06):149-156.[doi:doi:10.3969/j.issn.1001-7461.2014.06.29]
　GAO Ji-qing,YUN Ting,XUE Lian-feng*. Calculation of Actual LAI Based on Projection Algorithm and Active Contour Model[J].JOURNAL OF NORTHWEST FORESTRY UNIVERSITY,2014,29(06):149-156.[doi:doi:10.3969/j.issn.1001-7461.2014.06.29]
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 基于投影算法和活动轮廓模型的真实叶面积指数计算()
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《西北林学院学报》[ISSN:1001-7461/CN:61-1202/S]

卷:
第29卷
期数:
2014年06期
页码:
149-156
栏目:
出版日期:
2014-11-30

文章信息/Info

Title:
 Calculation of Actual LAI Based on Projection Algorithm and Active Contour Model
文章编号:
1001-7461(2014)06-0149-08
作者:
 高纪青; 云挺; 薛联凤*
 （南京林业大学 信息科学技术学院，江苏 南京 210037）
Author(s):
 GAO Ji-qing;  YUN Ting;  XUE Lian-feng*
 （College of Information Science and Technology, Nanjing Forestry University, Nanjing, Jiangsu 210037, China）
关键词:
 ; 真实叶面积指数; 测地线活动轮廓模型; 球极平面投影; Lambert投影
Keywords:
 ; actual leaf area index;  geodesic active contour model;  stereographic projection;  Lambert azimuthal equal-area projection
分类号:
S718.4
DOI:
doi:10.3969/j.issn.1001-7461.2014.06.29
文献标志码:
A
摘要:
 为了准确获得树木的真实叶面积指数（LAIa) ，提出一种基于投影算法和测地线活动轮廓模型的计算方法。首先对激光扫描仪获取的树木点云数据通经一定比例缩放在一个球的上表面，再通过球极平面投影和Lambert方位角等面积投影将上球面图像投射到平面上，借助地理学上纬度线的概念来表征不同高度叶子的天顶角，通过统计学方法获取叶倾角，然后用测地线活动轮廓模型对投影后的图像进行叶面部分分割，获取孔隙率。根据Beer-Lambert定律即可计算有效叶面积指数（LAIe）。真实叶面积指数的获取则通过有效地分层处理，解决叶子的重叠问题。最后将得到数据与实测叶面积指数进行比较，证明该方法的准确性、可行性。
Abstract:
 In order to obtain accurate actual leaf area index (LAIa), this paper presented a method based on plane projection algorithm and geodesic active contour models. At first, the point cloud data of the tree acquired by laser scanning were zoomed on the surface of a sphere by appropriate scaling. Then, through stereographic projection and Lambert azimuthal equal-area projection, the spherical image was projected onto the plane, with the geography latitude line concept to characterize zenith angle of the leaves of different heights, and to get leaf angle through statistical methods. After that, through the geodesic active contour model, the projected leaf image was segmented to obtain porosity. Calculating effective leaf area index according to Beer-Lambert law, and LAIa was got through effectively slicing which solved the problem of overlapping leaves. The measurement data were finally compared with manually measured LAIa, and the method was proved to be accurate and feasible.

参考文献/References:

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备注/Memo

备注/Memo:
 收稿日期：2014-01-02修回日期：2014-04-12
基金项目：国家自然科学基金（31300472）；江苏省自然科学基金（BK2012418）。
作者简介：高纪青，男，在读硕士，研究方向：图像处理。E-mail : 873661534@qq.com
*通信作者：薛联凤，女，硕士，副教授，研究方向：图像处理。xuelianfeng@njfu.edu.cn
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