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Method and apparatus for mapping printer resolution using lock-up-tables

  • US 5,265,176 A
  • Filed: 04/17/1991
  • Issued: 11/23/1993
  • Est. Priority Date: 04/17/1991
  • Status: Expired due to Fees
First Claim
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1. A method of mapping raster data input of a source data set, assembled in discrete groups and having a first resolution, to a destination data set, assembled in discrete groups and having a second resolution, wherein each data set has horizontal and vertical components, comprising:

  • defining a resolution ratio, having a numerator "N" for the source data set, and a denominator "D" for the destination data set;

    converting the horizontal component of the source data set by selectively copying N discrete groups of the source data set to form a row of the destination data set horizontal component having D discrete groups, wherein said converting includes generating N look-up tables for looking up D discrete groups of the destination data set from N discrete groups of the source data set to generate an intermediate data set including intermediate raster data patterns;

    copying, selectively, N rows of the source data set to form D rows of the destination data set; and

    combining one or more of said intermediate raster data patterns to produce a pixel output pattern, said combining involving a bit-wise logical combination.

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