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Image processing apparatus

  • US 20070013793A1
  • Filed: 12/16/2005
  • Published: 01/18/2007
  • Est. Priority Date: 07/15/2005
  • Status: Active Grant
First Claim
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1. An image processing apparatus comprising:

  • an effective pixel portion that accumulates an amount of first electric charge corresponding to an intensity of incident light from a subject;

    a shaded pixel portion that accumulates an amount of second electric charge, where the incident light is shaded from the subject;

    a QV conversion part that converts said first and second electric charges into analog signals, respectively;

    a signal processing section that processes said analog signals to generate an analog output signal;

    an A/D conversion section that converts said analog output signal into a digital output signal;

    a noise determination section that determines a noise level from said digital output signal;

    a brightness measuring section that measures brightness information in a predetermined region of said subject from said digital output signal based on said first electric charge;

    a target value setting section that sets a black level target value for said analog output signal or said digital output signal based on said noise level and said brightness information; and

    a black level setting section that sets a black level for said analog output signal or said digital output signal based on said black level target value;

    wherein said analog output signal or said digital output signal is corrected based on said black level.

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