System for correcting shading or non-uniformity in a photosensit

Details System for correcting shading or non-uniformity in a photosensit System for correcting shading or non-uniformity in a photosensit

1983-06-09

1985-05-28

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358282, H04N 514, H04N 140

Patent

active

045203954

ABSTRACT:
The invention is directed to a system for correcting shading or non-uniformities in the output of a linear photosensitive array. The invention employs a memory circuit having a number of cells corresponding to the number of photoelements positioned along the linear array. The sensor output of each respective element is successively compared with the data value stored in a corresponding memory cell in the memory. The data stored in the memory is updated by determining the larger data value signal and then storing that signal in the corresponding memory cell. This comparison and storage operation continues for each successive output signal produced by the linear array. The data stored in memory for each line represents the non-uniformity of the photosensor system including non-uniformities due to light source, lens, optical transmission and sensor characteristics. The stored data for each line is then converted in accordance with a weighting factor; the resulting converted data is multiplied by the received sensor output to produce sensor output response signals that compensate for the non-uniformities.

REFERENCES:
patent: 3590152 (1968-11-01), McDonald et al.
patent: 3790705 (1974-02-01), Kamin
patent: 3800078 (1974-03-01), Cochran et al.
patent: 4343021 (1982-08-01), Frame
patent: 4491961 (1985-01-01), Sutton et al.

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