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

An image technology and laser ranging technology, applied in the field of standing wood caliper devices, can solve the problems of low measurement efficiency, large data processing capacity, low efficiency, etc., and achieve the effect of being easy to carry and use

Inactive Publication Date: 2013-07-10
BEIJING FORESTRY UNIVERSITY
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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 b

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

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] Such as figure 1 , 2 Shown, the structure of device of the present invention and detection process are:

[0015] Such as figure 1 As shown, the device of the present invention uses a fixed-focus lens to take pictures, and when the object distance u of the fixed-focus lens is the same, the magnification of the camera is the same. The present invention uses a mobile phone to take pictures, and in order to ensure measurement accuracy, the distance between the mobile phone and the measured standing tree is no more than 3m.

[0016] The laser range finder (1) is connected with the mobile phone (3) based on the Android system through the data line (2), and the mobile phone (3) based on the Android system is equipped with a fixed-focus lens (4); the mobile phone (3) based on the Android system While taking pictures, the laser range finder (1) transmits the measured...

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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...

Claims

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Application Information

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IPC IPC(8): G01B11/08
Inventor 程朋乐于文华
Owner BEIJING FORESTRY UNIVERSITY
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