Solid state imaging system providing pattern noise cancellation

Details Solid state imaging system providing pattern noise cancellation Solid state imaging system providing pattern noise cancellation

1976-10-14

1978-03-14

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358167, H04N 530

Patent

active

040794237

ABSTRACT:
The present invention relates to a solid state imaging system in which pattern noise is cancelled both electrically and visually. Pattern noise takes the form of a succession of variable amplitude pulses occurring as each light sensing element in a row of elements is read out. The pattern noise is duplicated from row to row. Since pattern noise is initially many times larger than the video signal, it must be reduced to a fraction of the video signal for satisfactory imager operation. In accordance with the invention, a first video signal is formed in which each row of sensors is first scanned with video and pattern noise present followed by a second scanning with video absent and pattern noise present. The first video signal, delayed one horizontal line, is then combined subtractively with an undelayed first video signal to form a second video signal in which the video information in the first member of the line pair is of one polarity and of opposite polarity in the second member while the pattern noise is cancelled to a small residue of like polarity in both members of the line pair. A third video signal is formed with the video in each line pair of like polarity and the pattern noise residues of opposite polarity. The third video signal is now in a form suitable for visual cancellation of the pattern noise residues. This is accomplished by causing the third video signal to be displayed with the pattern noise of one polarity on odd lines of the monitor and of opposite polarity on even lines of the monitor.

REFERENCES:
patent: 3949162 (1976-04-01), Malueg

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