Vignetting compensating circuit for a video camera
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United States of America Patent
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-
Nov 28, 1989
Grant Date -
N/A
app pub date -
Nov 2, 1988
filing date -
Nov 18, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vignetting compensating circuit for a video camera utilizing the horizontal synchronizing signal and the vertical synchronizing signal. The circuit prevents vignetting on the screen from a signal generated by a video camera with a zoom lens by obtaining and adding inverse parabolic wave form voltages corresponding to the cycles of the horizontal synchronizing signal and the vertical synchronizing signal and controlling the amplification factors of a voltage controlled amplifier for the video signal by the added voltage.
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