Rapid variable angle electronic halftone screening using unrotat

Details Rapid variable angle electronic halftone screening using unrotat Rapid variable angle electronic halftone screening using unrotat

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

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