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Position: Home > Articles > Segmental rectification of tree ring photogrammetry Chinese Journal of Ecology 2008,27 (10) 1830-1834

树木年轮照片测量的区段校正

作  者:
刘琪璟
单  位:
北京林业大学省部共建森林培育与保护教育部重点实验室
关键词:
年轮;照片测量;几何校正
摘  要:
树木年轮宽度可以利用数码照片进行测定,但照片的几何变形需要进行校正。本文介绍一种分区段对图像进行校正的方法,对各区段分别确定像素分辨率,以此计算对应区段内的年轮宽度。基本过程是首先按1cm或更小的间隔测定区段的像素密度以及像素分辨率,然后测定以像素为单位的年轮宽度,再根据每个年轮所在区段的像素分辨率计算年轮实际宽度。所使用的图像处理软件是普及型软件,操作简单,方便实用,并可以获得较高的测定精度。
译  名:
Segmental rectification of tree ring photogrammetry
作  者:
LIU Qi-jing (Key Laboratory of Forest Silviculture and Conservation of the Ministry of Education, College of Forestry, Beijing Forestry University, Beijing 100083, China)
关键词:
tree ring; photogrammetry; geometric rectification
摘  要:
Digital photos can be used conveniently for measuring the width of tree ring, but geometric rectification is required because of image distortion. This paper introduced a new and easy-to-use method for the correction, which is called segmental rectification. By dividing a section into segments with certain intervals, the pixel resolution is determined for each segment, which is then used to calculate the tree ring width in corresponding segment. The basic process is: 1) divide the section into segments with 1 cm or smaller intervals, 2) calculate the resolution after counting the number of pixels in each segment, and 3) measure the tree ring width in pixels before converting to length unit based on segment-specific resolution. With common image processing software, the approach is simple and practical, and high accuracy can be secured.

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