Video apparatus for generating an adjustable contrast video sign

Details Video apparatus for generating an adjustable contrast video sign Video apparatus for generating an adjustable contrast video sign

1987-04-15

1988-11-29

Cardillo, Raymond F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358906, 358244, 353121, 355 67, 355 70, H04N 576, G03B 2754

Patent

active

047886005

ABSTRACT:
A video transfer stand generates a video signal from a front-illuminated image on a semi-transparent or translucent original, especially a photographic print. The video system, including the transfer stand and a video display connected to the stand, produces output video contrast as a function of the transfer characteristic (gamma) of the video system as it interacts with the contrast exhibited by the reflection density of the print. This interaction produces high contrast that blocks out details especially in shadow areas of the video display. Such undesirably high contrast is moderated--releasing shadow detail--by variably backlighting the print in the transfer stand. The rear illumination, which is adjusted in view of the display, produces inherently lower contrast than the reflected illumination and, in combination therewith, optimizes the video display contrast.

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