Methods of assigning pixels to cells of a halftone grid

Details Methods of assigning pixels to cells of a halftone grid Methods of assigning pixels to cells of a halftone grid

1991-02-08

1994-02-08

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358455, 358456, H04N 1387

Patent

active

052852911

ABSTRACT:
The invention provides an improved method for producing halftone images with digital halftone cell dimension and orientation to match a desired ideal halftone cell in an ideal halftone grid by choosing a reference ideal halftone cell size having a predetermined number of pixels and comparing the number of pixels in the newly selected halftone cells to the reference, thereby making the number of pixels in all ideal cells to be equal. Methods are provided for controlling the assignment of pixels on the boundary line between ideal halftone cells while avoiding pixel clustering.

REFERENCES:
patent: 4149194 (1979-04-01), Holladay
patent: 4185304 (1980-01-01), Holladay
patent: 4626902 (1986-12-01), Yamada
patent: 4916545 (1990-04-01), Granger
patent: 4977458 (1990-12-01), Granger et al.
patent: 5027078 (1991-06-01), Fan
patent: 5124803 (1992-06-01), Troxel

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