Read-out level compensation in an optical reader system

Details Read-out level compensation in an optical reader system Read-out level compensation in an optical reader system

1980-09-26

1983-05-10

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

3401463AG, 358282, 382 65, H04N 140

Patent

active

043832750

ABSTRACT:
An optical reader system includes a plurality of sensor elements for providing a picture signal. Before initiating an actual reading operation, a white background plate is scanned to obtain reference information. The white background plate data is reversed to obtain a reciprocal of the white level and the thus obtained reciprocal is memorized in a memory. In an actual reading operation, the picture signal derived from the sensor elements is multiplied by the reciprocal memorized in the memory to compensate for the nonuniformity of the sensor outputs.

REFERENCES:
patent: 3800078 (1974-03-01), Cochran et al.
patent: 3962681 (1976-06-01), Requa et al.
patent: 4070696 (1978-01-01), Mitchell
patent: 4129853 (1978-12-01), Althauser et al.
patent: 4216503 (1980-08-01), Wiggins
patent: 4228468 (1980-10-01), Nagano et al.
patent: 4240103 (1980-12-01), Poetsch et al.
Poetsch-A Continuous-Motion Color Film Telecine Using CCD Line Sensors, SMPTE Jour.-vol. 87, #12-Dec. 1978, pp. 815-820.

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