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Method and apparatus for adaptively sharpening an image

  • US 6,640,017 B1
  • Filed: 05/26/1999
  • Issued: 10/28/2003
  • Est. Priority Date: 05/26/1999
  • Status: Expired due to Fees
First Claim
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1. A method of sharpening an image comprising:

  • adaptively computing a crispening parameter for at least a portion of a captured image based, at least in part, on a measure of the edges and the brightness of the at least a portion of the captured image, comprising;

    computing a luminance value for the at least a portion of the captured image;

    computing a gradient magnitude value for the at least a portion of the captured image; and

    computing the crispening parameter based, at least in part, on, approximately, the relative values of the computed luminance value and the computed gradient magnitude value; and

    applying a kernel to the at least a portion of the captured image using the adaptively computed crispening parameter.

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