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Digital color image pre-processing

  • US 7,102,669 B2
  • Filed: 04/02/2002
  • Issued: 09/05/2006
  • Est. Priority Date: 04/02/2002
  • Status: Expired due to Term
First Claim
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1. A method for processing an image, comprising:

  • providing a sensor output;

    performing an automatic gain control of the sensor output to generate a first output,wherein the automatic gain control is applied in a digital domain, includingperforming an expansion of a histogram to fill a dynamic range;

    performing an automatic white balance correction to the first output to generate a second output;

    performing a gamma correction of the second output to generate a third output, whereinthe gamma correction performs a variable gamma correction to increase adynamic range of an image included in the second output;

    performing a color interpolation to the third output to generate a fourth output;

    performing a low-pass spatial filtration of the fourth output to generate a fifth output,wherein the low-pass spatial filtration is for eliminating a fixed pattern noise in a flat field;

    performing a color saturation and correction of the fifth output to generate a sixth output; and

    performing a high-pass spatial filtration of the sixth output to generate an image output.

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