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Measuring method of standing tree diameter at breast height based on optical similar triangle method

A technology of similar triangles and measurement methods, applied in the field of tree diameter measurement based on the optical similar triangle method, can solve the problems of result errors, environmental and human factors, etc.

Inactive Publication Date: 2016-04-27
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

The traditional method of measuring forest tree diameter at breast height, such as using a diameter measuring girth or a caliper, converts the length into a diameter scale, so as to estimate the forest tree diameter at breast height. The operation is greatly affected by environmental and human factors, and the result error is huge.

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  • Measuring method of standing tree diameter at breast height based on optical similar triangle method
  • Measuring method of standing tree diameter at breast height based on optical similar triangle method
  • Measuring method of standing tree diameter at breast height based on optical similar triangle method

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Embodiment Construction

[0038] The specific implementation method of the present invention provides a method for measuring the diameter of standing trees based on the optical triangulation method, the method is as follows figure 1 shown, including the following steps:

[0039] Step 1. Perform preprocessing on the photographed standing tree image, extract the laser spot skeleton part of a single pixel, and obtain the point (X', Y') of the laser spot on the phase plane;

[0040] The standing tree image preprocessing method described in this step comprises after carrying out G (green) component and B (blue) component weakening to image, carries out binarization processing to standing tree image; Said in this step extracts the laser spot skeleton of single pixel The method includes using the basic algorithm of mathematical morphology—expansion and erosion to realize the thinning of the laser spot, and then removing the noise points outside the skeleton of the laser spot by finding the largest connected a...

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Abstract

The invention provides a stumpage breast height diameter measuring method based on an optics similar triangle method. The stumpage breast height diameter measuring method based on the optics similar triangle method relates to forest measurement and includes the following steps: a camera and a laser are used to create a stumpage breast height diameter measuring system; the camera is used to take photos of a to-be-tested stumpage to obtain images of the stumpage; and after the shot images of the stumpage are preprocessed, a point, namely a laser spots falling on a phase plane, (X', Y') is obtained. According to an optics similar triangle principle, the point (X', Y' ) that the laser spot falls on the phase plane carries out coordinate transformation towards a three-dimensional space to obtain a point (X, Y, Z). The point (X, Y, Z) projects towards a horizontal direction to obtain a point (X projection, Y projection) after being processed. A least square circle fitting method is adopted to carry out circle fitting on the point(X projection, Y projection), and then a round radius parameter after fitting is a breast height diameter of the to-be-tested stumpage. The stumpage breast height diameter measuring method based on the optics similar triangle method has the advantages that algorithm can be realized easily and can measure the stumpage breast height diameter quickly in non-contact mode.

Description

technical field [0001] The invention relates to forest tree measurement, in particular to a method for measuring the diameter at breast height of a standing tree based on an optical similar triangle method. Background technique [0002] Forest stock volume is an important part of the country's natural resources, and its growth and decline dynamics are the main symbol of forestry economic benefits and the basis for formulating felling and cultivation plans. The traditional method of measuring forest tree diameter at breast height, such as using a diameter measuring girth or a caliper, converts the length into a diameter scale, so as to estimate the forest tree diameter at breast height. The operation is greatly affected by environmental and human factors, and the result error is huge. In order to solve the above problems, the inventor provides a method for measuring the diameter at breast height of standing trees based on the optical similar triangle method. Contents of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/08
Inventor 王典王建利李婷刘晋浩
Owner BEIJING FORESTRY UNIVERSITY
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