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Method for testing and calculating aperture opening ratio of sand prevention net based on optical projection

A technology of optical projection and calculation method, which is applied in the direction of calculation, computer parts, instruments, etc., and can solve the problems of inability to accurately measure the opening ratio and irregular shape of warp and weft weaving pores.

Active Publication Date: 2016-12-14
CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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AI Technical Summary

Problems solved by technology

Due to the irregular shape of warp-knitted sand-proof nets, the opening ratio cannot be accurately measured by conventional methods.

Method used

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  • Method for testing and calculating aperture opening ratio of sand prevention net based on optical projection
  • Method for testing and calculating aperture opening ratio of sand prevention net based on optical projection
  • Method for testing and calculating aperture opening ratio of sand prevention net based on optical projection

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Embodiment Construction

[0021] The present invention will be described in detail below with reference to specific embodiments.

[0022] In the present invention, the test sample is flattened on a white flat plate, and the grayscale photographing mode of the digital camera is used to photograph it, the feature point identification program is compiled based on the Harris operator, and the feature point identification of the grayscale picture is performed, and the feature points in the picture are further analyzed. Statistical analysis is carried out on the points to obtain the grid line area and the total test area area, and finally the opening rate of the sand control net is calculated. The specific implementation method is as follows:

[0023] 1. Cut the test sample, lay it flat on a white plate, and try to keep the sand-proof net in a flat and compacted state. Then use the digital camera to take pictures in grayscale mode (such as figure 1 ).

[0024] 2. Computer test:

[0025] (1) Crop the capt...

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Abstract

The invention relates to a method for testing and calculating the aperture opening ratio of a sand prevention net based on optical projection. Since a warp knitting sand prevention net has irregular warp knitting holes, the aperture opening ratio can not be accurately measured by using a routine method. The method includes the steps of cutting a test sample, laying on a white panel, and taking a photo by using a gray-scale shooting mode, cutting a grey-scale map, adjusting the brightness to save the grey-scale map with highest pixel, graying the image and identifying the characteristic points of the grayed image based on the Harris operator, obtaining the characteristic points in the grayed image, calculating the mesh line area according to the characteristic points, and further obtaining the percentage of the mesh line area to total test area. The problem that the aperture opening ratio of a sand prevention net with an irregular pattern can be solved. The aperture opening ratio value of various sand prevention nets can be obtained accurately, which is of great importance to product quality examination and sand prevention effect.

Description

technical field [0001] The invention relates to a method for calculating the opening ratio of a sand control net, in particular to a method for testing and calculating the opening ratio of a sand control net based on optical projection. Background technique [0002] The opening ratio refers to the percentage of the pore area to the total area in the frontal projection of the sand control net. The opening rate is an important indicator of the sand control effect of sand control products, which determines the ventilation rate of the product. The opening rate of the plain weave sand control net can be obtained by measuring the number and diameter of the warp and weft wires on the material with a known area, and calculating the percentage of pores. Due to the irregular shape of the warp and weft woven pore shape of the warp-knitted sand-proof net, the opening rate of the warp-knitted sand-proof net cannot be accurately measured by conventional methods. SUMMARY OF THE INVENTIO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62G06K9/42G06K9/46
CPCG06V10/32G06V10/40G06V10/758
Inventor 张华莹姚宏乐
Owner CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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