A Method for Determining Theoretical Porosity of Fabric by Image Method

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...

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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

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