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Block readable video imager having noise compensation

  • US 4,785,353 A
  • Filed: 03/13/1987
  • Issued: 11/15/1988
  • Est. Priority Date: 03/13/1987
  • Status: Expired due to Fees
First Claim
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1. In video imaging apparatus including a sensor having a plurality of photosites arranged in an array of rows and columns, the invention comprising:

  • sensor readout means for reading out said sensor in sequential blocks of parallel rows of photosites, such that the photosites included in a column are read out simultaneously, to produce an output signal including sequential blocks of video information, wherein each block of video information includes parallel lines of video signals arranged in columns of pixel video signals corresponding to the columns of photosites within a block;

    memory means for storing a set of noise compensation signals for at least one block of rows of photosites of said sensor, wherein each noise compensation signal of said set is applicable to all of the photosites in a column of photosites; and

    circuit means for reading out said set of compensation signals from said memory means and for compensating said one block of said output signal by applying to each pixel signal in a column of pixel signals the noise compensation signal corresponding to said column.

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