Halftone dot generator using grained screen patterns

Details Halftone dot generator using grained screen patterns Halftone dot generator using grained screen patterns

1989-02-27

1990-05-29

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358298, 358457, H04N 140

Patent

active

049300237

ABSTRACT:
A plurality of grained screen patterns that are different from each other are previously stored in a grained screen pattern memory. The grained screen patterns are accessed at random in response to an address signal (AGP) generated in a random number generator. An original image data is compared with the random arrangement of the grained screen patterns for each pixel, to produce a halftone dot image. The halftone dot image thus obtained has no periodic distribution of density, such as a moire.

REFERENCES:
patent: 4340912 (1982-07-01), Troxel
patent: 4673971 (1987-06-01), Ikuta et al.
patent: 4680596 (1987-07-01), Logan
patent: 4700235 (1987-10-01), Gall

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