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COLOR TRAPPING ON A HALFTONED BI-LEVEL BITMAP

  • US 20110243429A1
  • Filed: 04/05/2010
  • Published: 10/06/2011
  • Est. Priority Date: 04/05/2010
  • Status: Active Grant
First Claim
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1. A method for determining whether a color pixel resides along a two-color edge in a bi-level bitmap of a halftoned color image, the method comprising:

  • receiving a bitmap of a halftoned color image having a plurality of pixels;

    defining a window of size n×

    m centered on a current pixel in the bitmap;

    partitioning the window into a plurality of regions, with each region having an orientation direction with each orientation direction having an associated numeric value;

    counting a number of pixels of each of the first and second colors in each of the plurality of regions;

    determine which region has a maximum and minimum pixel count for each of the first and second colors; and

    using the maximum and minimum pixel counts and each of the associated orientation directions to determine whether the current pixel resides along a two-color edge in the bitmap.

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