Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1987-12-28
1988-10-04
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358224, 354409, H04N 5232, H04N 530
Patent
active
047758929
ABSTRACT:
A focusing aid for a manually-focused video camera provides an indication of optimum focus by varying the video brightness according to the high frequency content of the video signal. The brightness variation is confined to a focusing slit occupying a small area of the display in an electronic viewfinder. A high frequency component is separated from the video signal and converted into a d.c. control signal having an amplitude that varies with frequency content. By injecting the d.c. control signal into the video signal during the period of the focusing slit, the video level is varied and a significant brightness shift is produced proportional to high frequency content. Optimum focus is obtained by adjusting the focus and bringing the video in the focusing slit to maximum brightness.
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Chin Tommy P.
Eastman Kodak Company
Woods David M.
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