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Half toning pixel processor

  • US 5,016,191 A
  • Filed: 09/02/1988
  • Issued: 05/14/1991
  • Est. Priority Date: 09/02/1988
  • Status: Expired due to Fees
First Claim
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1. For a pixel processing system including a bit map memory storing pixel data bits, each pixel data bit corresponding to a separate pixel of a half tone cell array forming a graphic design and controlling appearance in said graphic design of said pixel data bit'"'"'s corresponding pixel, a half tone pixel processor comprising:

  • means for storing object description data indicating intensity and positioning relative to said half tone cell array of a graphic object to be included in said graphic design;

    addressable memory means for storing at various addresses pixel intensity threshold data corresponding to each pixel of a half tone cell and for reading out said pixel intensity threshold data when addressed;

    addressing means for determining from said stored object description data an address within said addressable memory means of pixel intensity threshold data corresponding to a particular pixel of said half tone cell array spanned by said graphic object when said graphic object is included in said graphic design, said addressing means addressing said addressable memory means with the determined address such that said addressable memory means reads out pixel intensity threshold data corresponding to the particular pixel;

    a comparator for comparing the intensity indicated by said object description data to the pixel intensity threshold data read out of said addressable memory means and producing an output bit indicating a result of the comparison; and

    means for setting a state of a bit stored in said bit map memory corresponding to said particular pixel in response to a state of said output bit.

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