Method of detecting blurred photographic originals

Details Method of detecting blurred photographic originals Method of detecting blurred photographic originals

1983-05-23

1987-03-31

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

Of photographic film

355 77, G01N 2159

Patent

active

046539263

ABSTRACT:
The transmission density of a photographic original is measured at parts thereof using a pair of light measuring systems having different measuring areas. A characteristic value of the frequency distribution of the difference between measured transmission densities obtained from the pair of light measuring systems is used to distinguish blurred images from sharp images.

REFERENCES:
patent: 3709613 (1973-01-01), Zahn et al.
patent: 3856417 (1974-12-01), Bey et al.
patent: 3981579 (1976-09-01), Weinert et al.
patent: 3984184 (1976-10-01), Pflugbeil
patent: 4001594 (1977-01-01), Akimoto et al.
patent: 4542984 (1985-09-01), Shiota et al.

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