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Method and apparatus for digital column fixed pattern noise canceling for a CMOS image sensor

  • US 6,914,627 B1
  • Filed: 05/27/1998
  • Issued: 07/05/2005
  • Est. Priority Date: 05/27/1998
  • Status: Expired due to Term
First Claim
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1. A MOS image sensor comprising:

  • a pixel array formed from a plurality of individual pixels organized as rows and columns, said pixel array including a reference row;

    analog signal processing circuitry for reading out analog signals from the pixel array;

    an analog-to-digital converter for converting analog signals from the analog signal processing circuitry into digital signals;

    fixed pattern noise storage circuitry for storing digital signals representative of the signals from the reference row of the pixel array; and

    a fixed pattern noise canceling processor for subtracting the digital reference row signals stored in the fixed pattern noise storage circuitry from the digital signals representative of the signals from the other pixels in the pixel array.

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