Image-based method for detecting tree diameter

A detection method and tree diameter technology, applied in the direction of measuring devices, instruments, optical devices, etc., can solve the problems of unable to place scales, large amount of data processing, low measurement efficiency, etc., to improve measurement efficiency, improve detection efficiency, hardware little effect

Inactive Publication Date: 2012-01-25
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

[0003] The School of Mechanical Engineering, Huazhong University of Science and Technology proposed a method of calibrating the camera with a measuring scale for measurement (Song Xiaochun, Kang Yihua, etc., Research on Forest Automatic Measurement System Based on Digital Image Processing, Computer Engineering and Design, 2005, 26(5): 1187 1189 .), the disadvantage of this method is that a ruler needs to be placed at the trunk to be measured, and the efficiency is relatively low, and it is impossible to place a ruler at the side trunk of some trees that cannot be approached and the height of the tree, so it cannot be measured
The disadvantage of this method is that it needs to use other measurement tools to measure the three-dimensional coordinates of space points, the amount of data processing is large, and the measurement efficiency is low.

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  • Image-based method for detecting tree diameter
  • Image-based method for detecting tree diameter
  • Image-based method for detecting tree diameter

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Embodiment Construction

[0014] Image-based tree diameter detection method, the laser beam is collimated and expanded and irradiated on the tree trunk where the tree diameter needs to be measured, a digital camera is used to take an image of the trunk where the laser spot is located, and the tree diameter is measured according to the number of pixels of the laser spot in the image , the specific implementation is as follows:

[0015] (1) The diameter of the beam emitted by the laser is d after being collimated and expanded 1 The beam of mm is irradiated on the trunk where the diameter of the tree needs to be measured,

[0016] (2) Take the image of the trunk at the position of the laser spot with a digital camera, and save the image in JPEG format,

[0017] (3) the taken digital photo is transmitted to the computer with the data line, and the number of pixels occupied by the laser spot diameter on the taken digital image along the trunk height direction is n 1 , the number of pixels occupied by the ...

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Abstract

The invention discloses an image-based method for detecting tree diameter, belonging to the technical field of non-contact measurement. A laser spot serves as an image measurement scale, a laser beam after collimated beam expansion irradiates a tree trunk the diameter of which is required to be measured to generate a light spot, a digital camera is used to take the image of the tree trunk at the position of the laser spot, and the tree diameter is measured according to the number of pixels of the laser spot in the image. In the measurement method of the invention, the less hardware is required, the calculated amount is small and the detection accuracy and the detection efficiency of tree diameter are improved.

Description

technical field [0001] The invention belongs to the technical field of image measurement, and relates to a method for detecting the diameter of a tree by using a digital camera, and is particularly suitable for measuring the diameter of a trunk at a long distance. Background technique [0002] In forest resources investigation, the measurement of tree diameter is a very important content. Traditional measurement methods are often used to measure directly with calipers, diameter tapes and gauges (hook rulers), but these tools can only measure the diameter at breast height of trees, but cannot measure the upper diameter of trees, and the measurement efficiency is relatively low. The non-contact measurement of tree diameter using image method can make up for the shortcomings of traditional measurement methods, and it has been paid more and more attention at present. [0003] The School of Mechanical Engineering, Huazhong University of Science and Technology proposed a method o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/08
Inventor 程朋乐李晓慧
Owner BEIJING FORESTRY UNIVERSITY
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