Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2007-05-08
2007-05-08
Lamb, Twyler (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S534000, C358S536000, C359S893000, C399S180000, C399S181000
Reexamination Certificate
active
10195424
ABSTRACT:
Conventional design tools were not developed for designing square zero-shift supercells. Conventionally, solutions that enable square zero-shift supercells were found by trial and error or by exhaustive analysis. According to a first design criterion of this invention, a non-square supercell in a first frame of reference has a diagonal that is equal in length to the diagonal of a square supercell in a second frame of reference rotated at a desired screen angle to the first frame of reference. The screen angle is a function of the lengths of the sides of the non-square supercell in the first frame of reference. According to a second design criterion, if the area of the corresponding square supercell in the second frame of reference is an integer, a square zero-shift supercell can be designed based on the lengths of the sides of the non-square supercell in the first frame of reference.
REFERENCES:
patent: 5124803 (1992-06-01), Troxel
T. M. Holladay, “An Optimum Algorithm for Halftone Generation for Displays and Hard Copies,”Proceedings of the SID, vol. 21/2, pp. 185-192, 1980.
Kau Steven
Lamb Twyler
Oliff & Berridg,e PLC
Xerox Corporation
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