Methods of controlling dot size in digital halftoning with multi

Details Methods of controlling dot size in digital halftoning with multi Methods of controlling dot size in digital halftoning with multi

1993-08-18

1994-04-19

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358455, 358459, H04N 140

Patent

active

053051181

ABSTRACT:
A method of equalizing the shape and size of halftone dots in a supertile having digital cells, corresponding ideal cells and pixels to faithfully reproduce an image having predetermined gray levels. Various techniques include: (1) adding offset vectors to the coordinates of pixels in digital cells; (2) determining twice as many smaller digital cells as original digital cells; and (3) determining a model digital cell and ranking pixels in remaining digital cells to mimic the ranking of pixels in the model cell.

REFERENCES:
patent: 4977458 (1990-12-01), Granger et al.
patent: 5031050 (1991-07-01), Chan
patent: 5111302 (1992-05-01), Chan et al.
patent: 5124803 (1992-06-01), Troxel

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