Method and apparatus for determining the sharpness of images

Details Method and apparatus for determining the sharpness of images Method and apparatus for determining the sharpness of images

1975-08-06

1976-10-05

Hix, L. T.

Photocopying

Projection printing and copying cameras

355 41, 355133, 356203, 355 77, G03B 2734, G03B 2768

Patent

active

039841847

ABSTRACT:
The variation in transparency along the surface of an original is detected and a corresponding transparency-indicating signal is generated. The spectral components of the transparency-indicating signal having frequencies above a predetermined frequency associated with sharp images are integrated to form an integration signal corresponding to the time integral of these higher-frequency spectral components. The determination of whether the original bears an image whose sharpness warrants copying of the original is made by comparing the integration signal against a reference signal.

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patent: 3520609 (1970-07-01), Lion
patent: 3635555 (1972-07-01), Kurahashi
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patent: 3709613 (1973-01-01), Zahn
patent: 3734611 (1973-05-01), Knapp et al.
patent: 3743416 (1973-07-01), Widmer et al.

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