Scanning and reproduction of pictorial images

Details Scanning and reproduction of pictorial images Scanning and reproduction of pictorial images

1975-02-13

1976-10-05

Moses, R. L.

Photocopying

Contact printing

Localized contrast modification

355 20, 355 68, 355 83, 355132, G03B 2776

Patent

active

039841871

ABSTRACT:
An original bears a pictorial image, or the like. The original is illuminated with first and second light and the image on the original is projected onto a copy carrier. The spatial variation of the intensity of the first light after the first light has been modulated in intensity by the image on the original is detected. The contrast of the image projected onto the copy carrier compared to the contrast of the image on the original is changed by changing the spatial variation of the second light in dependence upon the detected spatial variation of the intensity of the modulated first light.

REFERENCES:
patent: 2985086 (1961-05-01), Craig
patent: 3115807 (1963-12-01), Craig et al.
patent: 3177764 (1965-04-01), Akima
patent: 3183766 (1965-05-01), Takasaka et al.

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