Halftone screen using spot function to rank pixels following one

Details Halftone screen using spot function to rank pixels following one Halftone screen using spot function to rank pixels following one

1995-04-28

1996-12-24

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358458, 358534, 358536, H04N 1405, H04N 152

Patent

active

055878113

ABSTRACT:
A method of halftoning over a region of output pixels by defining large halftone cells corresponding to regions of contiguous pixels and partitioning the larger halftone cells into smaller halftone cells is disclosed. The number of levels of gray determined by the number of pixels within the larger halftone cell while resolution is defined by the size of the smaller halftone cells within the larger halftone cells. A predetermined level of gray determines the number of pixels to darken within the larger halftone cell and the pixels are darkened within the smaller halftone cell according to a spot function. The larger halftone cells are partitioned into smaller halftone cells such that the larger halftone cell has exactly one center smaller halftone cell.

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