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Generating, storing, and displaying graphics using sub-pixel bitmaps

  • US 7,209,148 B2
  • Filed: 03/23/2005
  • Issued: 04/24/2007
  • Est. Priority Date: 03/23/2004
  • Status: Active Grant
First Claim
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1. A method for generating a sub-pixel bitmap in a tile-based digital mapping system, comprising:

  • assigning a unique color for each source in a map to be created at a desired resolution;

    drawing a bitmap of the map at a higher resolution than the desired resolution, wherein each sub-pixel bitmap pixel corresponds to an N×

    M pixel area in the higher resolution drawing;

    for each of the N×

    M pixel areas in the higher resolution drawing, counting the number of pixels associated with each source;

    for each sub-pixel bitmap pixel, storing related source information and any corresponding weights, wherein a weight is used to indicate impact of a source on a sub-bitmap pixel; and

    representing the sub-pixel bitmap pixels using run-length encoding that indicates alternating sequences of single source pixels and mixed source pixels included in the higher resolution drawing.

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