Camera having a selected pattern of pre-exposure for final expos

Details Camera having a selected pattern of pre-exposure for final expos Camera having a selected pattern of pre-exposure for final expos

1981-02-03

1982-09-14

Griffin, Donald A.

Optics: motion pictures

Removable film strip magazine type

354202, 352 46, G03B 1503, G03B 1700

Patent

active

043492576

ABSTRACT:
An in-camera supplemental exposure correction system for achieving an evenly exposed final photographic image in a situation wherein the photographic scene is non-uniformly illuminated by an artificial light source by pre-exposing the film to supplemental illumination having a non-uniform pattern which is the inverse of the artificial scene illumination.

REFERENCES:
patent: 3312143 (1967-04-01), Karow et al.
patent: 3854815 (1974-12-01), McIntosh
patent: 4172640 (1979-10-01), Land
IBM Technical Disclosure Bulletin, "Illumination Compensation for COS.sup.4 -Lens Attenuation," by G. W. Hobgood, Jr., vol. 14, No. 11, Apr. 1972, p. 3324.

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