System for determining a video offset from dark photosensors in

Details System for determining a video offset from dark photosensors in System for determining a video offset from dark photosensors in

1996-01-05

1997-08-05

Faile, Andrew

Television

Camera, system and detail

Combined image signal generator and general image signal...

348244, 348307, 358463, H04N 964

Patent

active

056547552

ABSTRACT:
In a photosensitive device wherein voltages are read sequentially from a dark, or dummy, photosensor and a plurality of active photosensors with each of a series of scans, a circuit downstream of the photosensors resets the offset value of the voltage signals, based on successive voltage readings from the dark photosensor. An RC circuit in parallel with the video line maintains a running average of readings from the dark photosensor over a large number of scans. This averaging of many dark-pixel readings averages out short-term thermal noise on the dark photosensor, for a truer offset value.

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