Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-09-03
1994-03-01
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358465, 358466, 358500, H04N 140
Patent
active
052913104
ABSTRACT:
A halftone screen pattern generation system for computing halftone screened images with rotated screens including multiple angle and ruling combinations, including irrational tangent angles, is disclosed. A screen pattern is generated by storing a plurality of strips from an ideal angled screen pattern, and then concatenating a sequence comprising a selected order of the plurality of strips in a sequence. The error between the actual generated screen and ideal desired screen is computed. Each subsequent strip is selected from the plurality of strips so as to reduce the accumulated error. In one embodiment, a screen pattern is generated by storing one strip of an ideal angled screen pattern, and then concatenating a selected sequence comprising the strip and substrips of the strip. In accordance with another aspect of the present invention, the measure of error between the actual generated screen and the ideal angled screen is the length of a vector in a transformed UV space between the actual screen sample point and the idealized screen sample point. The error is determined by vector addition of the accumulated error, from strip to strip, which is added to the present error contribution from the present strip.
REFERENCES:
patent: 4852485 (1989-08-01), Brunner
Coles Sr. Edward L.
Grant II Jerome
Jacobson Allan
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