Multiple screen frequency half-toning with one screen angle

Details Multiple screen frequency half-toning with one screen angle Multiple screen frequency half-toning with one screen angle

1990-04-16

1992-04-21

Boudreau, Leo H.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358461, H04N 121

Patent

active

051073498

ABSTRACT:
A halftone threshold value supermatrix produces different screen frequencies between density steps, but at the same screen angle so as to provide image processing for rendering halftone images with an increased number of gray level steps without changing the apparent screen angle between density steps. A gray level pixel value is compared to a threshold value to make a print or no print decision. The threshold value may come from a j.times.k threshold value supermatrix divided into four equal submatrices of elements such that there is one more ON element in one of the submatrices than in the other three when there are an odd number of ON elements and there are the same number of ON elements in each of the submatrices when there are an even number of ON elements in the supermatrix.

REFERENCES:
patent: 4517605 (1985-05-01), Yokomizo
patent: 4553173 (1985-11-01), Kawamura
patent: 4651228 (1987-03-01), Koch

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