Process for inspecting the physical state of a printed document

Details Process for inspecting the physical state of a printed document Process for inspecting the physical state of a printed document

1979-11-27

1981-11-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356430, G01N 2188

Patent

active

042988071

ABSTRACT:
Documents are caused to pass in front of a light source incorporating optical fibres and the reflected light is collected by means of photoelectric elements. The collected reflected light is compared with a reference value. A row of photoelectric elements is used which successively transmits, by multiplexing, the signals delivered simultaneously by a row of the photoelectric elements. The analog signals are converted into digital signals, and a totalling and averaging of the digital signals is carried out in order to determine the state of general dirtiness of the document. The number of photoelectric elements of the row covered by the document is counted to inspect the width of the document and detect the presence of dog ears. In addition the number of photoelectric elements delivering a signal which exceeds a certain level is counted. Finally each digital signal corresponding to a point of the document is compared with a reference value in order to determine the presence of a hole, a stain or similar condition. The comparisons and tests are carried out by processing logic. The installation includes means for virtually displacing the reading head taking into account the real lateral displacement of the document in relation to the row of diodes.

REFERENCES:
patent: 3800148 (1974-03-01), De Cock
patent: 3986037 (1976-10-01), Faulhaber
patent: 4237539 (1980-12-01), Piovoso et al.

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