一种在直径线方向拟合多项式的树干解析方法  

A method of stem analysis with polynomial fit by diameter line

作　　者：辛洪录 吴保国[1,2] 

机构地区：[1]北京林业大学信息学院,北京100083 [2]北京林业大学林业信息化研究所,北京100083

出　　处：《生态学杂志》2017年第3期854-861,共8页Chinese Journal of Ecology

基　　金：国家高技术研究发展计划项目(2012AA102003)资助

摘　　要：本文介绍了一种操作简便、精度较高的圆盘解析测量方法:先在圆盘上放置刻度尺,利用数码相机拍摄圆盘以获得数字影像,通过计算机软件对数字影像校正,并进行每圈年轮半径的测量;然后,依次点选直径线与每圈年轮的交点,算出交点和髓心之间的坐标距离,并代入拟合方程,即可得到年轮的径向尺寸。分析结果显示,此方法测量半径的最大误差为0.007650 cm,最小误差为0.000040 cm,平均误差为0.002477 cm,而常规的毫米刻度尺测量方法的精度仅达到毫米与亚毫米级,大型专业的树木年轮分析仪器精度一般精度范围在0.0005~0.0010 cm。此方法具有成本低、方便快捷、操作简单、精度较高等优点,是一种有推广价值的树木年轮半径测量方法,对分析树木生长过程具有重要意义。This study introduced a wooden disc measuring method with simple operation and high precision in tree stem analysis. The operational approach can be followed in four steps：（ 1） Apply digital camera to shoot the dividing ruler placed on the disc;（ 2） Measure the ring radius by correcting digital images,which is realized by fitting polynomial equation from several fit points;（ 3） Calculate the coordinate distance between the intersection and the pith through clicking the intersection of lines and the radial of tree-ring successively;（ 4） Substitute numbers into regression equation to obtain the radius value of ring. Compared to conventional millimeter scale measurement,whose precision reaches only millimeter and sub millimeter,and the professional analysis instrument,whose precision accuracy ranges from 0. 0005 cm to 0. 0010 cm,this method is more advantageous,with the maximum measure error in radius being 0.007650 cm,the minimum error 0.000040 cm,and the average error 0. 002477 cm. With low cost,convenient and simple operation as well as high-precision,this method deserves promotion in analyzing the development of trees.

关 键 词：圆盘 直径测量 数字影像 多项式拟合 

分 类 号：S758[农业科学—森林经理学]