Image-based method for detecting tree diameter

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...

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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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