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Method for acquiring tree branch and trunk factors based on three-dimensional photographical measurement

A technology of stereo photography and branches, applied in the field of stereo photography of tree branches, can solve the problems of poor precision, long acquisition cycle, low efficiency, etc., and achieve the effect of accurate measurement, simple measurement, and simplified field measurement

Inactive Publication Date: 2013-12-18
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

[0003] In order to overcome the disadvantages of long acquisition period, low efficiency and poor precision of tree branch factor parameters obtained by traditional methods, improve efficiency and precision, and realize accurate measurement of parameters such as branch diameter, branch angle and branch azimuth angle of tree branches, this paper The invention provides a method for obtaining tree branch factors based on stereo photogrammetry, which is characterized in that a single tree is taken as the research object, a 3D digital camera is used as a shooting tool, and a single tree is stereoscopically photographed, and multiple cylinders are segmented Simulate the trunk and branches, restore the shape of the tree branches, and calculate and obtain tree branch factors such as the base branch diameter, branch angle, and branch azimuth of the primary, secondary, and tertiary branches of the tree

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  • Method for acquiring tree branch and trunk factors based on three-dimensional photographical measurement
  • Method for acquiring tree branch and trunk factors based on three-dimensional photographical measurement
  • Method for acquiring tree branch and trunk factors based on three-dimensional photographical measurement

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Embodiment Construction

[0016] The method of obtaining tree branch factors based on stereo photogrammetry is different from the existing methods, specifically:

[0017] (1) In the winter after the trees have fallen leaves, select a shooting point with a good observation range for a single tree, and use a 3D digital camera to shoot a single tree to obtain three-dimensional photo data of a single tree branch;

[0018] (2) According to the point cloud density and distance, the three-dimensional photography photos of single trees are used to simulate the trunk and branches of N small cylinders, and restore the shape of the branches of the whole tree;

[0019] (3) Obtain the diameter d of the first primary branch by calculating the diameter of the simulated cylinder at the first primary branch 1 ;

[0020] (4) By calculating the central axis L of the simulated cylinder at the first level branch 1 , the included angle with the central axis of the simulated cylinder at the trunk, to obtain the included an...

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Abstract

The invention discloses a method for acquiring tree branch and trunk factors based on three-dimensional photographical measurement. A 3D digital camera is utilized to shoot and acquire three-dimensional photos of an individual tree, a plurality of cylinders are utilized to simulate tree branches and tree trunks in a subsection mode to restore the shapes of the tree branches and the tree trunks, and the tree branch and trunk factors of the root branch diameters, branch and trunk included angles and branch azimuth angles of a first-level branch, a second-level branch and a third-level branch are acquired. The method improves the efficiency and the accuracy for acquiring the tree branch and trunk factors and overcomes the defects that existing tree branch and trunk factors are difficult to measure and low in accuracy.

Description

1. Technical field [0001] The invention relates to a method for obtaining tree branch factors based on stereo photogrammetry, in particular to using a 3D digital camera to perform stereo shooting of tree branches, and then measuring and obtaining the tree branch factors. 2. Technical background [0002] A tree has several branches, and the base branch diameter of each level branch is the main parameter for calculating the annual growth of the tree. Parameters such as branch inclination angle and branch azimuth angle are important factors affecting plant photosynthesis. The traditional tree branch factor measurement method is based on manual operations such as girth ruler and square ruler measurement readings. Not only the means are backward, the efficiency is low, and the accuracy is poor, but also due to the complexity of the tree branch shape and the inaccessibility of tall trees , the measurement object is limited to young trees, and it is difficult to measure the paramet...

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Application Information

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IPC IPC(8): G01C11/04
Inventor 冯仲科闫飞韦雪花巩垠熙高原
Owner BEIJING FORESTRY UNIVERSITY
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