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Black level adjustment device and method for CMOS image sensor

  • US 8,878,965 B1
  • Filed: 06/26/2013
  • Issued: 11/04/2014
  • Est. Priority Date: 06/26/2013
  • Status: Active Grant
First Claim
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1. A black level adjustment method for a CMOS image sensor with a pixel array comprising dark rows and active rows, the method comprising the steps of:

  • computing an average value of pixels from the dark rows, wherein the average value is in the form of an integer and a fraction;

    calculating a black level control (BLC) offset value according to the integer;

    generating a dithering mask based on the fraction;

    applying the dithering mask to pixels from the active rows; and

    adding the calculated BLC offset value to the dithered pixels from the active rows to generate resulting pixels.

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