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Image enhancement system

  • US 5,218,649 A
  • Filed: 05/04/1990
  • Issued: 06/08/1993
  • Est. Priority Date: 05/04/1990
  • Status: Expired due to Fees
First Claim
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1. A method for digital image enhancement using a processing system including means for receiving and displaying image comprised of decoded pixel digital data, the data defining edge and nonedge regions in the image, the method comprising the steps of:

  • (a) receiving a digital image;

    (b) differentiating between edge pixel data and nonedge pixel data in said digital image;

    (c) filtering each edge pixel by identifying a first edge image region, said first edge image region including said edge pixel, and determining a filtered edge pixel value based on pixel data in said first edge image region, such that the staircase effects appearing when said filtered edge pixels are displayed are decreased;

    (d) filtering each nonedge pixel by identifying a first nonedge image region, said fist nonedge image region including said nonedge pixel, and determining a filtered nonedge pixel value based on pixel data in said first nonedge image region, such that the loss of detail and contouring effects appearing when said filtered nonedge pixels are displayed are decreased; and

    (e) combining said filtered edge pixel data and said filtered nonedge pixel data to form an enhanced image.

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