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Standing tree height measuring method based on monocular vision

A technology of height measurement and monocular vision, which is applied in the direction of measuring devices, mechanical measuring devices, instruments, etc., can solve the problems of time-consuming, complicated calculation of tree height measurement, and inability to detect the height of standing trees quickly and conveniently, achieving less time-consuming, The effect of convenient equipment integration and high degree of automation

Inactive Publication Date: 2020-01-10
ZHEJIANG FORESTRY UNIVERSITY
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  • Description
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Problems solved by technology

[0004] The present invention mainly solves the problems of complex computation and time-consuming tree height measurement in the prior art, and cannot quickly and conveniently detect the height of standing trees, and provides a method for measuring the height of standing trees based on monocular vision

Method used

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  • Standing tree height measuring method based on monocular vision
  • Standing tree height measuring method based on monocular vision
  • Standing tree height measuring method based on monocular vision

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Embodiment

[0062] This embodiment is a method for measuring the height of a standing tree based on monocular vision, specifically a method for measuring the height of a standing tree with the help of a smart phone combined with machine vision technology. The smart phone has a camera and a high-precision gyroscope. Methods The GraphCut algorithm is used to segment the standing tree image to realize the automatic acquisition of the height pixels of the standing tree in the standing tree image, and then the depth information of the standing tree image is automatically obtained through the geometric similarity model, and then the angle information of the built-in gyroscope of the mobile phone and the height information of the mobile phone shooting are extracted to solve the problem. It provides a set of new measurement methods and technical means for forest resource investigation.

[0063] The specific steps of the method of this embodiment include:

[0064] S1. Calibrate the camera and obta...

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Abstract

The invention discloses a standing tree height measuring method based on monocular vision. The problems that existing tree height measurement has complex operation and large consumed time and the standing tree height cannot be rapidly and conveniently detected are solved. The method comprises the following steps of calibrating a camera, acquiring internal parameters of the camera, performing standing tree contour extraction on an input image, establishing a geometric model of the distance between an image coordinate system and a world coordinate system, acquiring a standing tree image depth relational expression, establishing a height pixel coordinate mapping model, acquiring a to-be-measured target height relational expression, and calculating a standing tree height according to the shooting height and angle of the camera. The method has low measurement cost and high working efficiency, only an existing smart phone needs to be adopted, only the shooting angle and the shooting height need to be obtained, and operation is more convenient and faster. Moreover, the measurement method does not need complex operation, less time is consumed, the algorithm precision is high, the automation degree is high, and the operation is simple.

Description

technical field [0001] The invention relates to the technical scope of tree detection, in particular to a method for measuring the height of standing trees based on monocular vision. Background technique [0002] Tree height is one of the important symbols to evaluate the quality of standing trees and the growth status of trees, and it has become a necessary work in forest resources investigation. Tree measurement tools and their algorithms are the basic way to obtain basic tree measurement factors, their accuracy and practicability are extremely important, and their modernization level also reflects the forestry modernization level [5] . At present, mainstream altimetry instruments, such as the Brewles altimeter [6] Because of its low price, simple operation, and ability to meet the requirements of general accuracy, it is widely used, but it is limited by the need to measure horizontal distances, and it is easily affected by occlusion in actual forest measurement. 3D las...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/06
CPCG01B5/0035G01B11/0608
Inventor 徐爱俊陈相武
Owner ZHEJIANG FORESTRY UNIVERSITY
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