Partially correlated minimum visibility halftone patterns for di

Details Partially correlated minimum visibility halftone patterns for di Partially correlated minimum visibility halftone patterns for di

1997-02-14

1999-08-31

Au, Amelia

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358534, B41J 1500

Patent

active

059464526

ABSTRACT:
A method for halftoning a digital image having an x,y array of pixels each having an associated input pixel value, includes the steps of providing a memory containing a dither bitmap for each input pixel value of the digital image where the dither bitmaps are partially correlated; selecting a dither bitmap corresponding to the input pixel value for a pixel in said digital image; modularly addressing the selected dither bitmap with the location of said pixel to obtain an output halftone image value; and repeating steps for each pixel in the digital image.

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