Method of modifying slide transparencies so as to provide unifor

Details Method of modifying slide transparencies so as to provide unifor Method of modifying slide transparencies so as to provide unifor

1980-07-29

1984-06-19

Haroian, Harry N.

Optics: image projectors

Distortion compensation

B03B 2100

Patent

active

044550677

ABSTRACT:
Photography, particularly, a method of modifying slide transparencies so as to eliminate distortion and to provide uniform illumination in oblique projection, for example, upon rear view screens.
The method of modifying slide transparencies includes supporting the object to be photographed at an angle with respect to the optical path of the camera; selectively illuminating the object to be photographed such that the portion farthest from the camera receives the greatest portion of the light with the rest of the object being gradually and continuously less illuminated so the portion nearest the camera receives the least light; and, taking a picture of the object, such that the transparency defines the object being photographed in trapezoidal form with the wider base being the least illuminated and the narrow apex being the greatest illuminated.

REFERENCES:
patent: 1651574 (1927-12-01), Beechlyn
patent: 2004798 (1935-06-01), Poser
patent: 2296928 (1942-09-01), Briechle et al.
patent: 2299682 (1942-10-01), Conant
patent: 3049966 (1962-08-01), Gruner
patent: 4166694 (1979-09-01), Hirning et al.

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