Efficient use of dither matrix based gray level patterns

Details Efficient use of dither matrix based gray level patterns Efficient use of dither matrix based gray level patterns

1996-04-23

1997-04-29

Evans, Arthur G.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358457, 358455, 358465, 358466, G06K 1500, H04N 140

Patent

active

056257562

ABSTRACT:
A printer apparatus and method for operating a digital printer are provided which utilize a super-pixel bit map set containing a plurality of pixel pattern bit maps, each pixel pattern bit map defining the on or off condition for a plurality of individual pixels which make up a super-pixel which forms a part of a printed area, such as for gray or color shading. The method includes accepting an input value for a particular super-pixel to be printed, the input value being from one of a set of available input values defined by an input array set; providing a threshold array which defines available pixel pattern bit maps which can be used in printing super-pixels for a particular print job; producing a key array which assigns a different key identifier to each of the available pixel pattern bit maps defined by the threshold array; associating an input value with a key identifier; using the key identifier to access or build and access a suitable pixel pattern bit map for a particular super-pixel to be printed; and transferring the pixel pattern bit map to effect printing of the super-pixel being printed.

REFERENCES:
patent: 5107349 (1992-04-01), Ng et al.
patent: 5150428 (1992-09-01), Leone et al.
patent: 5177623 (1993-01-01), Hirota
patent: 5315669 (1994-05-01), Kumagi

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