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Semiconductor integrated apparatus and black level correction method for image sensor

  • US 20070075772A1
  • Filed: 02/24/2006
  • Published: 04/05/2007
  • Est. Priority Date: 09/30/2005
  • Status: Active Grant
First Claim
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1. A semiconductor integrated apparatus, comprising:

  • a variable gain amplifier for amplifying a pixel value detected by an image sensor;

    a black level correction circuit for judging whether or not a period of an amount of change in gains of the variable gain amplifier being equal to or greater than a predetermined value continues for a predefined period or more, making a black level value of the image sensor which is output from the variable gain amplifier as new black level reference value if a period of an amount of change in gains of the variable gain amplifier being equal to or greater than a predetermined value continues for a predefined period or more, correcting a black level of a valid pixel of the image sensor based on the black level reference value, or correcting a black level of the valid pixel based on the previous black level reference value in lieu of updating it if a period of an amount of change in gains of the variable gain amplifier being equal to or greater than a predetermined value does not continue for a predefined period or more; and

    an automatic gain control circuit for controlling a gain of the variable gain amplifier based on a value of a valid pixel which is corrected for a black level by the black level correction circuit.

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