Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1995-01-10
1997-11-25
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358460, H04N 140, H04N 146
Patent
active
056918224
ABSTRACT:
In halftone imaging using rotated halftone dot cells, the determination of correspondences between microdots and threshold matrix cells is simplified by leaving the threshold matrices which overlie each halftone dot cell unrotated. Threshold decisions for each microdot in a given horizontal row of a grid proceed in sequence. Each increment along a microdot row within a halftone cell is a unit increment along a horizontal axis of the threshold matrix. Hence, within each halftone cell, two integer additions are sufficient to derive an address of the threshold matrix cell associated with a microdot given the address of the threshold matrix cell associated with the previous microdot.
REFERENCES:
patent: 5274473 (1993-12-01), Kidd et al.
patent: 5315407 (1994-05-01), Sakamoto et al.
patent: 5381247 (1995-01-01), Hains
patent: 5463471 (1995-10-01), Chou
Brinich Stephen
Coles Sr. Edward L.
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