Automatic dark level zeroing for an analog video signal

Details Automatic dark level zeroing for an analog video signal Automatic dark level zeroing for an analog video signal

1994-05-31

1995-11-28

Kostak, Victor R.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348255, 348691, H04N 516

Patent

active

054712440

ABSTRACT:
An automatic dark level zeroing circuit removes a dark level DC bias from an analog video signal generated by a charge-coupled device (CCD) camera, The automatic dark level zeroing circuit is DC-coupled to the CCD camera such that there is no loss of low frequency information in the analog video signal, The automatic dark level zeroing circuit forms an adaptive feedback loop that removes the dark level DC bias from the analog video signal by using a sampled value of the analog video signal that represents an internally masked pixel to produce a zero correction signal that is then combined with the analog video signal to remove the dark level DC bias without removing any useful video information or otherwise altering the information content of the analog video signal,

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