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Image sensor and black level calibration method thereof

  • US 8,520,101 B2
  • Filed: 04/09/2012
  • Issued: 08/27/2013
  • Est. Priority Date: 07/11/2011
  • Status: Active Grant
First Claim
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1. A black level calibration method for an image sensor, the image sensor at least comprising a pixel array, the pixel array comprising a first optical black area, a second optical black area and an active pixel area, the method comprising:

  • a) reading first optical black analog information from the first optical black area;

    b) determining a black level offset according to the first optical black analog information;

    c) reading second optical black analog information from the second optical black area;

    d) determining a black level calibration value according to the black level offset and the second optical black analog information;

    e) reading active analog information from the active pixel area; and

    f) calibrating a black level of the active analog information according to the black level calibration value.

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