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Method for determining theoretic porosity of fabric through image method

A technology of porosity and image method, which is applied in the field of measuring the theoretical porosity of grid-like sparse fabrics by image method, which can solve troublesome and time-consuming problems

Inactive Publication Date: 2013-12-25
DONGHUA UNIV
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Problems solved by technology

Or directly measure the diameter of the yarn in the magnifying instrument, this method is troublesome and time-consuming
In the image processing method, Jiangnan University obtains the horizontal and vertical information of the grid circle fabric according to the frequency domain transformation, and then uses the frequency domain inverse transformation to obtain separate images of warp and weft yarns, extracts information such as yarn diameter and yarn spacing, and judges the image Whether there are defects such as scattered edges in the test, but the porosity analysis is not involved

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Method for determining theoretic porosity of fabric through image method
  • Method for determining theoretic porosity of fabric through image method
  • Method for determining theoretic porosity of fabric through image method

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[0046] The present invention will be further described below in combination with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0047] The invention is a method for measuring the theoretical porosity of fabrics by image method. The warp tightness and weft tightness of fabrics are determined by image processing method, the total tightness of fabrics is calculated according to the formula, and the theoretical porosity P is obtained by calculation. l =1-E; where,

[0048] E=E j +E w -0.01×E j ×E w ;

[0049] In the formula, E is the total tigh...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention relates to a method for determining the theoretic porosity of a fabric through an image method, and in particular relates to a method for determining the theoretic porosity of a latticed sparse fabric through an image method. The method comprises the following steps of analyzing and processing a sparse fabric image through a digital image processing technology to obtain a theoretic porosity index; converting a gray image into a binary image according to a gray histogram two-peak method threshold of the fabric image, setting the pixel of a yarn region in a binary matrix corresponding to the binary image as 1, respectively projecting the binary matrix in the warp yarn direction and the weft yarn direction, and analyzing the central line positions of warp yarns and weft yarns; analyzing a cut image peripheral region according to the central positions of side yarns, wherein the quantity of the warp yarns and the quantity of the weft yarns in a new image are integers; acquiring the diameters of the yarns according to analysis on a wavy curve formed by projection of the binary matrix; calculating warp tightness and weft tightness so as to obtain the theoretic porosity index. By the adoption of the method, the theoretic porosity index can be objectively, accurately and quickly calculated.

Description

technical field [0001] The invention relates to a method for measuring the theoretical porosity of a fabric by an image method, in particular to a method for measuring the theoretical porosity of a grid-like sparse fabric by an image method. Background technique [0002] The traditional method of fabric theoretical porosity is calculated by measuring the warp and weft density and the diameter of warp and weft yarns. The measurement of warp and weft density usually uses a cloth mirror to manually measure the number of yarns within 10 cm. When counting yarns, if half a yarn The line time is rounded to an integer according to the situation. The measurement of the yarn diameter in the fabric is generally to remove the yarn from the fabric, measure the gram weight per unit length and then convert it into the yarn diameter. Or directly measure the diameter of the yarn in a magnifying instrument, which is troublesome and time-consuming. In the image processing method, Jiangnan Un...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 陈霞汪军傅婷万贤福李立轻梁翠芳朱方亮
Owner DONGHUA UNIV
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