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US 4,413,284 AGranted
Noise reducer for a solid state imager
AssigneeHitachi, Ltd.
InventorsMorishi Izumita, Toshiyuki Akiyama, Kazuhiro Sato, Shusaku Nagahara
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AssigneeHitachi, Ltd.
InventorsMorishi Izumita, Toshiyuki Akiyama, Kazuhiro Sato, Shusaku Nagahara
Estimating the term…
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.
In a solid-state imaging apparatus wherein photo signal outputs of a plurality of photosensors arrayed in horizontal and vertical directions are read out onto vertical signal lines through a first group of switches which are driven by vertical scanning pulses and wherein the photo signal outputs on the respective vertical signal lines are fetched onto an output line through a second group of switches which are driven by horizontal scanning pulses;
Dependencies are inferred from the claim text.