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Grassland coverage measurement method based on computer image processing

An image processing and computer technology, applied in the field of image processing, can solve the problems of different measurement results, differences in lighting environment, and inability to batch process massive photos, etc.

Inactive Publication Date: 2018-02-09
TIANJIN RES INST FOR WATER TRANSPORT ENG M O T
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are differences in the lighting environment when each photo is taken, and the artificial setting of the recognition rules brings in subjective factors, causing the measurement results to vary from person to person, and the recognition rules that cannot be adaptive do not have the ability to batch process massive photos ability

Method used

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  • Grassland coverage measurement method based on computer image processing
  • Grassland coverage measurement method based on computer image processing
  • Grassland coverage measurement method based on computer image processing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Taking a photo of grassland taken vertically downward in a certain area as an example, the grassland coverage measurement method based on computer image processing is used to automatically measure the coverage of the grassland taken by it.

[0045] Such as figure 1 As shown, the specific calculation steps are as follows:

[0046] Step 1. Obtain the color image of the grass in the specified area and convert it to an EXG grayscale image:

[0047] Hold the SONY DSC-W90 card camera and hold it horizontally, and take a color digital photo of the grass in the designated area vertically downward at a height of about 1.5m above the grass, such as figure 2As shown; due to the good weather conditions and sufficient light that day, the camera is set to automatic mode; specifically, the aperture value is f / 8, the shutter speed is 1 / 1600 second, and IS0-400. From this long color digital photo, it can be seen that the grassland in the area belongs to the desert steppe, the backgro...

Embodiment 2

[0058] Such as Figure 7 ~ Figure 9 Shown is the color digital photos, the EXG threshold value-segmentation intensity curve with the lower envelope drawn and the best EXG The black-and-white binary image corresponding to the threshold value has a grassland coverage measurement result of 10%.

Embodiment 3

[0060] Such as Figure 10 ~ Figure 12 Shown is the color digital photos, the EXG threshold value-segmentation intensity curve with the lower envelope drawn by using the computer image processing-based grassland coverage measurement method in a certain area of ​​sandy land greening type grassland and the best EXG threshold value correspondence The black-and-white binary image of , the grassland coverage measurement result is 10%.

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Abstract

The invention discloses a grassland coverage measurement method based on computer image processing. The method comprises the steps that acquired color photos are sequentially converted into EXG grayscale images, and the EXG grayscale images are converted into N black and white binary images representing plants and backgrounds by sequentially setting N integers between an EXG minimum value and an EXG maximum value as an EXG threshold; by judging all boundary pixels of each black and white binary image one by one, an average EXG gradient intensity value of the boundary pixels is obtained as thepartition intensity corresponding to the threshold; an EXG threshold-partition intensity curve taking the EXG threshold as the horizontal coordinate and taking the partition intensity as the verticalcoordinate is drawn; and a clearance curve is drawn by delineating a lower envelope curve, an optimal EXG threshold is obtained, and a grassland coverage measurement result is obtained. The grasslandcoverage measurement method is implemented on the basis of the computer image processing technology, and measurement result differences generated by different illumination environments when the photosare shot in the method and subjective factor differences brought by manual setting of a recognition rule do not need to be considered.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method for measuring and calculating grass coverage based on computer image processing. Background technique [0002] Traditional calculations include visual estimation, sampling and photography. The visual estimation method is simple and easy to implement, but it is subjective and arbitrary, and the measurement results are closely related to the actual coverage of the visual estimation object and the experience of the measurement personnel. The sampling method is to drop sample needles vertically in the grassland by setting the quadrat, and record the percentage of the sample needles hitting the grass industry as the cover value. The operation is complex and time-consuming. The photography method is a method developed after the popularization of digital cameras. Identifying grass blade pixels from digital photos has the advantages of simplicity, economy, and less tim...

Claims

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Application Information

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IPC IPC(8): G06T7/136
CPCG06T7/136G06T2207/10024G06T2207/30188
Inventor 胡健波周斌彭士涛
Owner TIANJIN RES INST FOR WATER TRANSPORT ENG M O T
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