The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 1989
Filed:
May. 08, 1987
Douglas I Haines, Mulino, OR (US);
Patrick E Welborn, Tualatin, OR (US);
Tektronix, Inc., Beaverton, OR (US);
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.