Measuring and testing – Sheet – woven fabric or fiber
Patent
1989-08-15
1990-09-04
Hornsby, Harvey C.
Measuring and testing
Sheet, woven fabric or fiber
139 1B, 139 1D, 139 1E, 26 70, 66 54, 356238, 358101, G01B 1100, D03D 5100
Patent
active
049534009
ABSTRACT:
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:
REFERENCES:
patent: 2882785 (1959-04-01), Biesele, Jr.
patent: 4124300 (1978-11-01), Mead et al.
patent: 4509076 (1985-04-01), Yoshida
patent: 4582095 (1986-04-01), Kromholm
patent: 4619527 (1986-10-01), Levenberger et al.
patent: 4643230 (1987-02-01), Remmer et al.
patent: 4648712 (1987-03-01), Brenholdt
patent: 4665317 (1987-05-01), Ferriere et al.
"Wetenschappelijk en Technisch Centrum van de Belgische Textieln
Hornsby Harvey C.
Machuga Joseph S.
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