Apparatus for determining with high resolution the position of e

Details Apparatus for determining with high resolution the position of e Apparatus for determining with high resolution the position of e

1982-11-10

1985-12-17

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250563, 250572, 356237, 356431, G01B 1104, G01N 2100

Patent

active

045594511

ABSTRACT:
Apparatus for scanning a document includes an array of light emitting diodes, or optical fibers, arranged across the width of the document and extending further than its edges, a corresponding array of photo-diodes, or fiber optics connected to photo-diodes, for providing analog intensity signals indicative of the degree of transmission of light to each sensor, and an analyzing circuit responsive to each of the intensity signals to determine the condition of the document, and especially to determine the position of the edges of the document, and the size of any pin-holes or tears in the document. According to the invention, the analyzing circuit derives digital signals indicative of the relative intensity value of each analog signal with regard to three or more predetermined threshold values of intensity, each threshold level corresponding to a different degree of obscuration of a sensor by the corresponding area of the document. If a threshold value T3 is exceeded, but a higher threshold value T4 is not exceeded, then the circuit assumes that the corresponding sensor indicates 1/4 obscuration, and that for example the edge of the document lies at a distance from the neighboring sensor equal to 1/4 of the separation between adjacent sensors.

REFERENCES:
patent: 3835332 (1974-09-01), Bridges
patent: 3859538 (1975-01-01), Mannonen
patent: 4172666 (1979-10-01), Clarke
patent: 4376583 (1983-03-01), Alford et al.

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