Noise reducer for a solid state imager

Details Noise reducer for a solid state imager Noise reducer for a solid state imager

1981-12-31

1983-11-01

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358167, 358 44, H04N 315, H04N 521, H04N 907

Patent

active

044132840

ABSTRACT:
This invention relates to a solid-state imaging apparatus wherein photo signals are read out through MOS type FETs from photosensors such as photodiodes arrayed in two dimensions in large numbers, and consists in remarkably enhancing the signal-to-noise ratio of an output signal by reducing or eliminating noise components to mix into the photo signals.
The analysis of the noise components has revealed the correlation in which the noise component in a certain polarity develops in the opposite polarity again after a period that is shorter than one horizontal scanning period by the duration of one horizontal scanning pulse. With note taken of the correlation, a solid-state imaging apparatus comprising a processing circuit which includes a delay circuit and an adder circuit and which cancels the noise is provided.

REFERENCES:
patent: 4079423 (1978-03-01), Diehl
patent: 4212034 (1980-07-01), Kokie et al.
patent: 4283742 (1981-08-01), Izumita et al.

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