Scanning apparatus for halftone image screen writing

Details Scanning apparatus for halftone image screen writing Scanning apparatus for halftone image screen writing

1989-11-13

1990-10-23

Griffin, Donald A.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

358298, G01G 1500, H04N 122

Patent

active

049655990

ABSTRACT:
Moire patterns in raster-scanned halftone dots image screens generated by multi-element line scanner devices are rendered imperceptible to the human eye by selecting the number of elements in the line scanner device to be that number which makes the "once-around" scanner frequency an integral multiple of the halftone dot screen frequency and makes the beat frequencies between the scanner and frequencies either fall outside the nominal visible spatial frequency range of about 2.5 to 250 lines per inch or fall on the screen frequency.

REFERENCES:
patent: 4185304 (1980-01-01), Holladay
patent: 4730221 (1988-03-01), Roetling
patent: 4758886 (1988-07-01), Rylander
patent: 4847643 (1989-07-01), Ohmori

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