Multiple separation error diffusion, with cross separation corre

Details Multiple separation error diffusion, with cross separation corre Multiple separation error diffusion, with cross separation corre

1994-12-06

1996-10-15

Wong, Peter S.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358515, 358518, 358530, 358534, H04N 140, H04N 146, H04N 156, H04N 162

Patent

active

055659942

ABSTRACT:
An image processing system for preparing a document for printing which receives multi separation color documents for printing, each discrete area or pixel in the image described by a signal having a number of possible states greater than can be rendered by a selected printer. In such a system, each separation of the image is separately processed with an error diffusion process which takes into account the processing of another separation, if any. Output signals from a separation are used to determine threshold values for at least one other separation. The varying thresholds are used to vary the likelihood of the current pixel being a spot or no spot.

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