Video viewfinder system

Details Video viewfinder system Video viewfinder system

1986-02-28

1987-09-08

Mathews, A. A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

354188, 354200, 354219, 358224, G03D 1302, G03D 1704

Patent

active

046920064

ABSTRACT:
A video viewfinder system according to the preferred teachings of the present invention is shown for use with a camera of a standard design. The video viewfinder system includes video monitors for displaying derived images from a video camera of a primary image formed by the lens of the camera to allow the photographer to view the primary image formed by the camera lens at locations remote from the camera. Specifically, the video viewfinder system of the preferred form includes a viewfinder hood secured to the camera having a ground glass located at its first end for forming the primary image by the camera lens and with the video camera located at its second end and aimed at the primary image. To provide more uniform brightness of the derived image, a fresnel lens is associated with the ground glass for concentrating the outgoing light rays from the ground glass to the video camera and an anti-vignetting filter having gradating density from its center outward is provided for selectively absorbing the outgoing light rays from the ground glass to the video camera.

REFERENCES:
patent: 2709391 (1955-05-01), Reeves
patent: 3883883 (1975-05-01), Sano et al.
patent: 4303322 (1981-12-01), Someya

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