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Edge enhancement which reduces the visibility of false contours

  • US 6,259,822 B1
  • Filed: 10/30/1998
  • Issued: 07/10/2001
  • Est. Priority Date: 10/30/1998
  • Status: Expired due to Term
First Claim
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1. A method of edge enhancing a digital image having pixels which reduces the visibility of false edge contours, comprising the steps of:

  • a) acquiring a digital image;

    b) computing an edge boost record having positive and negative boost values for different portions of the edge regions in a digital image;

    c) modifying the edge boost record by applying an adaptive blur kernel to the pixels of said edge boost record by;

    (i) providing the blur kernel in response to the boost values of a predetermined number of pixels near the pixel of interest; and

    (ii) using the geometric pattern of positive and negative boost values in constructing the blur kernel so that only non-negative boost values are used to modify a non-negative boost value, and only non-positive boost values are used to modify a non-negative boost value; and

    d) applying the modified edge boost record to the digital image to provide an edge enhanced digital image which reduces the visibility of false edge contours.

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