System for measuring canopy density

A technology of canopy density and tree canopy, which is applied in the system field of measuring tree canopy density, can solve the problems of cumbersome operation of digital cameras and fisheye lenses, high computer image analysis skills, high cost, etc., and improve the level of fine management of blueberries , the calculation result is intuitive and clear, and the effect of low cost

Active Publication Date: 2018-06-05
DALIAN UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, digital fisheye image technology has been widely used in canopy density measurement. This method has the advantages of high efficiency and low cost, but the photo processing is more complicated.
[0005] For ordinary blueberry growers, there are several problems in the current methods of measuring canopy density: (1) The accuracy of visual inspection and looking up methods is low, which cannot meet the requirements of tree pruning, and is not suitable for small shrub blueberry tree species; (2) Instrument measurement methods such as canopy meters are expensive and high-technical, and can only be used by professionals; (3) 3S technology to measure canopy density is used in large-scale forest lands, and requires relatively high Computer image analysis skills; (4) Digital cameras and fisheye lens methods are cumbersome to operate, and photo processing is more complicated; (5) The parameters such as canopy closure calculated by the above-mentioned various methods can only be understood by professionals, but it is difficult for blueberry growers to understand , it is impossible to judge whether these parameters are good or not

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Embodiment 1

[0050] The present embodiment provides a kind of device of measuring and calculating the canopy density of blueberry canopy, comprising: Android mobile phone, selfie stick and fisheye lens; The back of Android mobile phone is clamped upward on the selfie stick, and bluetooth is adopted between the Android mobile phone and the selfie stick Connected, the fisheye lens is clipped on the camera on the back of the Android phone, and the selfie stick adjusts its length according to the needs of taking pictures.

Embodiment 2

[0052] The present embodiment provides a system for measuring the canopy density of blueberry trees, including:

[0053] The image acquisition module is used to obtain the fisheye photo and record the sensor value of the smart device at the same time;

[0054] The image rotation module uses three parameters of X, Y, and Z to describe the rotation state of the smart device, where X represents the azimuth of the horizontal rotation of the smart device, and rotates the photo according to the X value recorded when taking pictures;

[0055] The image preprocessing module removes the images of the ground, weeds under blueberry trees and other trees in the fisheye image, and extracts the canopy photos;

[0056] In the fisheye image segmentation module, the combination operator R-G-B is selected as the feature quantity for algebraic operation, and the obtained grayscale image is used as input, and the threshold segmentation is performed using the Otsu maximum inter-class variance meth...

Embodiment 3

[0062] The present embodiment provides a kind of method of measuring and calculating the canopy density of blueberry canopy, specifically comprising:

[0063] S1, to obtain a 180° full-frame fisheye image: select the morning before the sun comes out, with the fisheye lens up, lean over and hold the selfie stick, and extend the mobile phone into a certain height inside the blueberry tree canopy, adjust the mobile phone to make it horizontal, when When the phone prompts with vibration and sound, press the camera button on the selfie stick to take a fisheye photo, and record the value of the phone's orientation sensor at the same time. Fisheye photos should be checked after shooting to ensure the quality of the photos is acceptable.

[0064] S2. Rotate the image: According to the azimuth value of the direction sensor when taking the photo, rotate the photo clockwise. At this time, the photo is up north and down south, left west and right east, which is in line with the user's hab...

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Abstract

The invention relates to a system for measuring the canopy density, which comprises the steps of obtaining a fisheye picture, and recording the value of an intelligent equipment sensor at the same time; rotating the picture according to the sensor value recorded during photographing; removing images of ground, weed under a blueberry tree and other trees in the fisheye picture, and extracting a canopy image; dividing the canopy image into two classes which are branches and leaves and the background; referring to the image before classification, and removing a main branch image spot from a canopy classification result image; dividing the fisheye picture into fan-shaped sections in a plurality of directions; calculating the proportion of the total number of pixels of branch and leaf classification spots in the fan-shaped sections to the number of pixels in the fan-shaped sections, i.e., the canopy density of the fan-shaped sections. The system can judge whether the canopy density of the blueberry is high or low and is reasonable or not so as to achieve scientific pruning for the tree, thereby having important significance for improving the fine management level of the blueberry and achieving good quality and high yield of the blueberry.

Description

[0001] This application is a divisional application with application number 2017100129285, application date January 09, 2017, and the title of the invention "Devices, systems and methods for measuring canopy density of blueberry trees". technical field [0002] The invention belongs to the field of fruit tree planting, and in particular relates to a system for measuring and calculating the crown canopy density. Background technique [0003] The canopy is an important place for photosynthesis of trees and plays a vital role in the vitality and productivity of trees. Canopy density is one of the important parameters to describe the canopy structure, indicating the degree of canopy closure. This concept has been widely used in stand quality evaluation, forest landscape, forest light, canopy diversity, wildlife habitat and forest management, etc. field. Blueberry is a small shrub and light-loving tree species of the genus Vaccinium in the Rhododendronaceae family. Reasonable p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/11G06T7/136G06T7/194
CPCG06T7/0002G06T2207/10004G06T2207/30188G06T7/11G06T7/136G06T7/194
Inventor 张自川李根柱
Owner DALIAN UNIV
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