A stumpage height extraction method under a plane constraint

A technology of plane constraint and extraction method, applied in image data processing, measurement devices, instruments, etc., can solve the problems of high scene geometry requirements, unstable measurement result accuracy, and different measurement result accuracy, so as to reduce errors and improve flexibility. sex, reduce the effect of cumbersome process

Inactive Publication Date: 2019-03-08
ZHEJIANG FORESTRY UNIVERSITY
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Problems solved by technology

Wang Meizhen [11] The camera plane and the three-dimensional scene are used to calculate the line segment distance through the parameters obtained by linear transformation; but the accuracy of the algorithm is affected by the selection of the reference length in the three-dimensional scene, and the measurement results of the length of the line segment to be measured in different directions ha

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  • A stumpage height extraction method under a plane constraint
  • A stumpage height extraction method under a plane constraint
  • A stumpage height extraction method under a plane constraint

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Embodiment Construction

[0052] In order to make the technical solution of the present invention clearer, the following in conjunction with the attached Figures 1 to 7 , the present invention will be described in detail. It should be understood that the specific implementations described in this specification are only for explaining the present invention, and are not intended to limit the protection scope of the present invention.

[0053] Step 1: Selection of Reference Objects

[0054] Select a cuboid whose length is greater than width and whose height and width are equal as a reference object; the specifications of the reference object are 70cm in length, 50cm in width, and 50cm in height. The plane constraints provided by the reference object under this size facilitate the extraction of the coordinates of the vanishing point. Such as figure 1 shown.

[0055] Step 2: Obtain the standing tree image of the height to be measured

[0056] Firstly, use a digital camera to capture the image of the r...

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Abstract

The invention discloses a stumpage height extraction method under a plane constraint, which is characterized in that the method comprises the following steps of step 1 selecting a reference object; 2obtaining a standing wood image of that height to be measured; 3 identifying that outline of the reference object; 4 detecting that coordinates of the extinction point; 5 constructing cross ratio information, setting MN as a reference object of a known height, so that that height of the object to be measure MQ can be calculated through the ratio of the two, the height of the tree to be measured isset as T2, and the height of the tree to be measured can be obtain according to the proportional relationship between pixels when the height of the tree to be measured is known T2=MQ. The method of the invention can complete the height measurement of the standing timber without obtaining the internal and external parameters of the camera, simplifies the tedious process in the computer operation process, reduces the error of the straight line detection result, improves the flexibility of the line segment calculation in the plane, and is particularly suitable for the geometric information extraction of the standing timber scene object under the structured condition.

Description

technical field [0001] The invention relates to a method for measuring tree heights, in particular to a method for extracting standing tree heights under plane constraints. Background technique [0002] Determining the height of trees has become a must in forest resource surveys [1] . At present, in addition to the traditional visual method, simple methods such as manual contact surveying and mapping methods [2] In addition, the sensor-based laser dendrometer [3] , telescopic dendrometer [4] Measurement methods such as tools are also widely used. Traditional surveying and mapping methods are labor-intensive, labor-intensive, and inefficient, while professional precision measuring equipment has problems such as complicated operation, difficult portability, and high cost [5-6] . With the development of science and technology, machine vision technology for tree height measurement has the advantages of accurate image information, simple equipment operation, and low cost. ...

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Application Information

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IPC IPC(8): G06T7/60G01B11/06
CPCG06T7/60G01B11/0608G06T2207/20068G06T2207/20016G06T2207/30188
Inventor 徐爱俊陈相武周素茵
Owner ZHEJIANG FORESTRY UNIVERSITY
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