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

045661219

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 with detectors for the waves reflected by the article when advanced before said devices. The apparatus comprises also detectors for the waves transmitted through the article and placed in front of said emitter devices. Regulating methods of the apparatus are also described for raising the sensitivity of the identification signals through setting of the distances between the emitter devices, detectors for transmitted waves 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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