Porosity detection method for soil

Abstract

The invention discloses a porosity detection method for soil, relating to the technical fields of agriculture and computer pictures. The porosity detection method for the soil comprises the following steps of: S1, acquiring the microscopic images of a soil sample, and pre-processing the microscopic images, so as to convert the microscopic images to greyscale images and remove noise; S2, generating a greyscale co-occurrence matrix of the greyscale images after the noise removal; S3, calculating the characteristic values such as contrast CON, correlation COR, inverse difference moment IDM and entropy ENT of the greyscale co-occurrence matrix; S4, fitting the contrast CON, the correlation COR, the inverse difference moment IDM and the entropy ENT according to preset fitting indexes to obtain the fitting equation of the porosity; and S5, substituting the contrast CON, the correlation COR, the inverse difference moment IDM and the entropy ENT of the greyscale co-occurrence matrix of the to-be-detected soil in the fitting equation to obtain the porosity of the to-be-detected soil. With the adoption of the porosity detection method for the soil disclosed by the invention, the porosity of the soil can be rapidly and accurately calculated.

Description

technical field [0001] The invention relates to the fields of agriculture and computer image technology, in particular to a soil porosity detection method. Background technique [0002] Soil porosity and particle composition are important physical parameters of soil and the most basic data for soil research, especially in soil model research and geotechnical tests. Among them, the particle distribution is closely related to the soil structure and soil texture, and the porosity directly affects the migration of water and air in the soil and the growth of roots in the soil. [0003] At present, there are mainly two methods for measuring soil porosity, one is the traditional experimental method, and the other is the computer graphics method. The traditional experimental method is represented by the drying method. The experimental steps are as follows: first, take the required soil sample with a ring knife and weigh it, then put it in an oven and dry it at 105°C for 24 hours, a...

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Problems solved by technology

[0014] The disadvantages of the above methods are: the traditional method is slow, the test period is long, the drying method takes about 10 hours, and the straw method takes several days; the operation is complicated, and there are high requirements for the operator's operation level; and the relative error of the experimental results is large. Big

The biggest limitation of the method of calculating soil porosity through computer graphics is that there is no generally accepted standard for the selection of the threshold, and different threshold selections will result in different porosity results, which is highly dependent on the experience of researchers

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