Method for detecting defocused photographic image

Details Method for detecting defocused photographic image Method for detecting defocused photographic image

1983-02-15

1985-09-24

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 77, 250201, 356125, G03B 2772

Patent

active

045429847

ABSTRACT:
When a photographic film is to be printed, it is necessary to remove such defocused photographic images which are caused by improper focusing. In this invention, transmittivity or transmission density of an image recorded on photographic film is measured consecutively by scanning it with two photometric systems having different measuring areas, and a defocused photographic image is detected from the relation between the measured distribution of the difference between two measured values in the transmittivity and the contrast values which is obtained by totalling local contrasts measured all over the photographic film.

REFERENCES:
U.S. Application Ser. No. 251,098, filed 4/6/81, Inventor--Takashi, Fukui; abandoned 8/17/84.

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