Image processing apparatus using derived ordered dither matrix

Details Image processing apparatus using derived ordered dither matrix Image processing apparatus using derived ordered dither matrix

1994-02-23

1997-06-17

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358536, H04N 146

Patent

active

056402490

ABSTRACT:
In multi-gradation level processing performed by using an ordered dither scheme, offset information between one dither matrix value and dither matrices is set, and all multi-gradation level threshold values are calculated from the basic dither matrix values and the offset information. Multi-gradation level processing is performed by comparing an input image with the calculated threshold values. With this operation in the multi-gradation level processing performed by the ordered dither scheme, all the dither threshold values required for the multi-gradation level processing are generated from the basic dither matrix information and the offset information.

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patent: 4626901 (1986-12-01), Tanioka
patent: 5014333 (1991-05-01), Miller et al.
patent: 5204753 (1993-04-01), Tai
Limb J.O., Bell System Tech. J. 48, pp. 2555-2582, 1969.
An Optimum Method for Two-Level Rendition of Continuous-Tone Pictures by B. E. Bayer, proceedings of the IEEE International Communications Conference, New York, 1973, pp. 26-11 thru 26-15.

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