Process and device for automatically detecting faults in fabrics

Details Process and device for automatically detecting faults in fabrics Process and device for automatically detecting faults in fabrics

1983-12-09

1986-10-28

Kittle, John E.

Optics: measuring and testing

Inspection of flaws or impurities

Textile inspection

356232, 356430, 356390, G06K 908, G01N 2116, G01N 2132

Patent

active

046195270

ABSTRACT:
A boundary or line-detecting process using image-filtering is used to detect fabric faults in moving textile fabric webs. A double-slit mask or an electrical equivalent thereof is used as a filter. The output signal of the filter is formed from the difference between the two luminosity values averaged across each slit of the filter mask. The image-filtering system is realized either by non-coherent optical spatial filters or by means of digital electronic circuits. The surface of the fabric web generally has a certain texture which already contains boundary and line elements. These basic values are used to derive fabric-specific parameters from which the boundary or line elements due to fabric faults are deducted. The boundary or line elements which remain, owing to their increased contrast, unambiguously indicate faults in the fabric web.

REFERENCES:
patent: 3658420 (1972-04-01), Axelrod
G. L. Rogers, "Non-Coherent Optical Processing", John Wiley, New York, 1977, S. H. Lee, Editor.
"Optical Information Processing", Topics in Applied Physics, Springer, vol. 23 and 48.
M. A. Monahan et al., in IEEE Proceedings, vol. 65 (1977), pp. 121-129.
A. Rosenfeld and A. C. Kak, "Digital Picture Processing", Academic Press, New York, 1976.
W. K. Pratt, "Digital Image Processing", John Wiley & Sons, New York, 1978.
W. Frei and Chung-Ching Chen, in IEEE Transactions on Computers, Oct. 1977, "Fast Boundry Detection".

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