Method of discriminating sheet

Details Method of discriminating sheet Method of discriminating sheet

1983-06-10

1986-03-25

Krass, Errol A.

Boots, shoes, and leggings

250562, 364154, 382 7, G01C 2500, G01N 2188

Patent

active

045787700

ABSTRACT:
In a method of discriminating a sheet of the present invention, a comparison and discrimination value becoming the reference of the comparison and discrimination of a printing pattern data is updated whenever the preceding sheet passes through a photodetector. Accordingly, the comparison and discrimination of the following sheet is performed based on the updated comparison and discrimination value, and is not affected by the variation in the sensitivity of the photodetector.

REFERENCES:
patent: 3818198 (1974-06-01), Walker et al.
patent: 3881651 (1975-05-01), Wilhelm, Jr.
patent: 4121291 (1978-10-01), Hoffner et al.
patent: 4184081 (1980-01-01), Bergamini
patent: 4237539 (1980-12-01), Piovoso et al.
patent: 4249244 (1981-02-01), Shofner et al.
patent: 4464786 (1984-08-01), Nishito et al.
patent: 4494183 (1985-01-01), Bayer et al.
IEEE Trans Aerospace & Electronic; May 1977; "Adaptive Thresholding Systems"; Torrieri, pp. 273-280.
IBM Tech. Disc. Bulletin; Jul. 1979 (V 22, N 2); "Automatic LED/Phototransistor Calibration Circuit"; Beirne et al., p. 800.
IBM Tech. Disc. Bulletin; Aug. 1981 (V 24, N 3); "Automatic Calibration of Scanner Compensation Apparatus"; Bushaw et al., pp. 1652-1654.

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