Automatical generation of a periodic pattern without occurrence

Details Automatical generation of a periodic pattern without occurrence Automatical generation of a periodic pattern without occurrence

1994-06-30

1995-03-14

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, 358457, 358466, H04N 140

Patent

active

053981189

ABSTRACT:
In a digital halftone screen generating device for generating a digital halftone screen comprising a plurality of periodic patterns, a configuration determining section (53) determines a grid (27) indicative of a configuration of one of the periodic patterns in the digital halftone screen by using periodic constants (51). Supplied with the periodic constants (51) and a function (50) defining a procedure for obtaining threshold values in a square area, a threshold value distributing section (54) rotates the threshold values defined by the function (50) by a screen angle. The threshold value distributing section (54) expands on the grid (27) threshold values enlarged by an enlargement ratio. When the threshold values on the grid (27) have discontinuous numbers, the threshold value distributing section (54) rearranges the threshold values so as to have continuous numbers. The threshold value distributing section produces a periodic pattern signal (52) indicative of the threshold values having the continuous numbers.

REFERENCES:
patent: 4499489 (1985-02-01), Gall et al.
Kinoshita et al., "Kaiteiban Kiso Shashin Seihan", pp. 186-189 (1980).
Harrington, Computer Graphics A Programming Approach, 2nd Edition, pp. 17-20 (1987).

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