Process and apparatus for identifying articles of sheet material

Details Process and apparatus for identifying articles of sheet material Process and apparatus for identifying articles of sheet material

1983-04-08

1986-01-21

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

324 585R, 340600, 382 58, G06K 900, G01R 2704

Patent

active

045661227

ABSTRACT:
An apparatus for the identification by microwaves of a sheet article composed of an electrically non-conductive material, the article being marked for identification by the incorporation therein of electrically conductive fibers. The apparatus comprises: at least two microwave emitter devices one adjacent the other; detectors of waves reflected by the article when advanced before said devices; a screen placed in front of at least one of the emitters; and, regulating means for raising the sensitivity of the identification signals by setting the distances between the emitter device, screen and support for the interposed article.

REFERENCES:
patent: 3506829 (1970-04-01), Hannan
patent: 3851971 (1974-12-01), Koch
patent: 4183989 (1980-01-01), Tooth
patent: 4265703 (1981-05-01), Terliska
patent: 4352988 (1982-10-01), Ishida
patent: 4368421 (1983-01-01), Glander et al.
patent: 4408156 (1983-10-01), Veys

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