Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1987-05-08
1989-04-18
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 78, 358283, 358298, H04N 146
Patent
active
048231894
ABSTRACT:
A record in which a color is represented on a record medium at a selected gray scale level is created by resolving an addressable area of the record medium into a square array of addressable record locations and organizing the record locations into a plurality of groups each containing a 4.times.4 array of record locations. The groups are organized into a plurality of dither cells each containing a 4.times.4 array of groups, whereby each dither cell contains 256 addressable record locations. An [i+(j.times.16)]th gray scale level is established within a selected area of the record medium, where i is an integer in the range from zero to 16, j is an integer in the range from zero to 16 and [i+(j.times.16)] is an integer in the range from zero to 255, by addressing j record locations in each group of each dither cell within the selected area and addressing one additional record location in each of the i groups of each dither cell within the selected area, the j addressed locations in each group being substantially contiguous and being in substantially the same positions in their group as the j addressed locations in each other group, and the i groups which contain an additional addressed record locations being distributed substantially uniformly over the dither cell.
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Haines Douglas I.
Welborn Patrick E.
Faris E. Anne
Groody James J.
Hulse Robert S.
Smith-Hill John
Tektronix Inc.
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