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Method and apparatus for compressing and decompressing color video data with an anti-aliasing mode

  • US 5,046,119 A
  • Filed: 03/16/1990
  • Issued: 09/03/1991
  • Est. Priority Date: 03/16/1990
  • Status: Expired due to Term
First Claim
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1. A method for compressing digital video color data comprising the steps of:

  • considering the video data in blocks of n×

    n pixels;

    determining two diverse colors for each of said blocks by examining the n2 pixels in each of said blocks;

    determining if the difference in said two diverse colors for each of said blocks is greater than a first threshold value, andif said difference is greater than said first threshold value, representing said block with four colors and a 2 n×

    n bitmap, two of said four colors being intermediate colors calculated from said two diverse colors, said bitmap for selecting among said four colors,if said difference is less than said first threshold value, representing said block as one color.

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