Methods and apparatus for avoiding moire in color scanners for g

Details Methods and apparatus for avoiding moire in color scanners for g Methods and apparatus for avoiding moire in color scanners for g

1985-01-02

1986-09-23

Capossela, Ronald C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, G03F 310

Patent

active

046138960

ABSTRACT:
Methods and apparatus for avoiding moire occurring in color scanning for graphic art, wherein light rays from a color original are passed through a pick-up lens, and prior to starting the color scanning, are modulated by means of a low-pass filter, which modulated rays are branched into two optical paths, on one of the paths a lattice plane is provided so as to project the modulated rays thereon, the lattice plane being beforehand selected in accordance with various conditions for scanning. A possible moire on the lattice plane is observed thereby to adjust the low-pass filter by replacement or displacement until the moire disappears on the lattice plane. Finally the light rays from the color original are modulated by the selected low-pass filter.

REFERENCES:
patent: 2977407 (1961-03-01), Hirsch
patent: 4189744 (1980-02-01), Stern
patent: 4271429 (1981-02-01), Herbst
patent: 4330797 (1982-05-01), Yokokawa et al.
patent: 4556901 (1985-12-01), Sakamoto

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