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Method of measuring the yarn density of a woven fabric or the stitch density of a knit fabric for readjusting the production machine in question

机译：测量机织织物的纱线密度或针织物的线圈密度的方法，用于重新调整所涉及的生产机器

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摘要

A method of measuring the yarn density of a woven fabric or the stitch density of a knitted fabric by recording a video image of the woven or knitted fabric to be examined by means of a video camera, converting the video image by an analog-to-digital converter into digital video information, storing the digital video information in a digital image memory and converting said information by a central processing unit into the yarn density or stitch density. The digital video information is converted by a digital band filter (14) with central circle frequency (. omega..sub.o) into a yarn or stitch density, and that the digital band filter (14) is arranged in such a manner that it operates according to the formula:PPY.sub.k =A.sub.m ·X.sub.k-m +A.sub. m-1 ·X.sub.k-m+1. . . +A.sub.o X.sub.k -B.sub.1 ·Y.sub. k-1 -B.sub.2 Y.sub.k-2. . . B.sub.n Y.sub.k-nPP wherein: PPX.sub.k represents a series of points of the digital information characteristic at interspace T before the digital filtering; Y.sub.k represents the said series of points k of the filtered digital information characterisitcs via digital filtering at the same interspace T; the coefficients A and B are a function of the quality Q, the central circle frequency &ohgr;.sub.o and the interspace T.

机译：一种通过用摄像机记录要检查的纺织物或针织物的视频图像，并通过模拟到数字转换视频图像来测量纺织物的纱线密度或针织物的线圈密度的方法。数字转换器将其转换为数字视频信息，然后将数字视频信息存储在数字图像存储器中，并由中央处理单元将其转换为纱线密度或线圈密度。数字视频信息由具有中心圆频率（ωo）的数字频带滤波器（14）转换为纱线或线圈密度，并且数字频带滤波器（14）的布置方式应使它根据以下公式运行：

Y.sub.k = A.sub.m·X.km。+ A.sub。 m-1·X k-m + 1。。。 + A.sub.X.k.-B.sub.1·Y.sub。 k-1 -B.sub.2 Y.sub.k-2。。。 B.n.Y.k-n

其中：

X.k。代表数字信息特征在数字滤波之前在间隔T的一系列点; Y k表示在相同的间隔T处经过数字滤波的滤波后的数字信息特征的所述点k系列;系数A和B是质量Q，中心圆频率ωo和间隔T的函数。展开▼

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公开/公告号US4953400A

专利类型
公开/公告日1990-09-04

原文格式PDF
申请/专利权人 WETENSCHAPPELIJK EN TECHNISCH CENTRUM VAN DE BELGISCHE TEXTIELNIJVERHEID AFGEKORT TOT CENTEXBEL;
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申请/专利号US19890394270
发明设计人 FILIP O. P. BOSSUYT;
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申请日1989-08-15
分类号G01B11/00;D03D51/00;
国家 US
入库时间 2022-08-22 06:07:00

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