Standing-tree diameter measuring device based on laser ranging and image technologies

Abstract

The invention discloses a standing-tree diameter measuring device based on laser ranging and image technologies. The standing-tree diameter measuring device has the structure that a laser range finder is connected with a mobile phone based on an Android system through a data wire; a prime lens is arranged on the mobile phone based on the Android system; the laser range finder is used for transmitting the measured distance value u between the mobile phone and a standing tree to the mobile phone while the mobile phone based on the Android system takes a photo; and the actual diameter of the standing tree can be calculated according to a calibration function, the measured distance and the number of pixels of the standing-tree diameter on an image. By adopting the standing-tree diameter measuring device based on the laser ranging and image technologies, the diameter value of a trunk of the standing tree can be quickly detected.

Description

technical field [0001] The invention belongs to the technical fields of machine vision technology and tree detection, and in particular relates to a standing tree diameter measuring device based on laser ranging and image technology. Background technique [0002] Machine vision is a comprehensive technology that integrates digital image processing, machinery, control, optics, computer and other technologies. The machine vision system can realize non-contact detection of the target, can quickly obtain a large amount of information, and is easy to process automatically. Wide range of applications. [0003] In forest resources investigation, the measurement of tree diameter is a very important content. Internationally, it is generally believed that the diameter of the trunk at a height of 4.5 feet (about 1.37m) is closest to the true diameter of the tree. When measuring the diameter of a single standing tree in China, most of them rely on the operator's experience to estimate...

AI Technical Summary

Problems solved by technology

[0004] 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 when measuring each tree, a ruler needs to be placed at the trunk to be measured, and the efficiency is relatively low, and some trees that cannot be approached in mountainous areas and the side trunks at the height of trees cannot place rulers ,not measurable

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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