Non-linear luminance signal processor responsive to average picture level (APL) of displayed image
First Claim
1. Video signal processing apparatus for use in a television system, comprising:
- a first input terminal for providing a video input signal to be processed;
a second input terminal for providing a control signal representative of the average picture level (APL) of video signals displayed by said television system;
signal processing means responsive to said video input signal for providing a first video output signal linearly related to said video input signal and for providing a second video output signal non-linearly related to said video input signal;
first combining means for combining said first and second video output signals in predetermined proportions to provide a third video output signal having both linear and non-linear components; and
second combining means for combining said second and third video output signals in proportions determined by said control signal for providing a processed video output signal.
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Accused Products
Abstract
A signal processor responsive to a video input signal provides a first video output signal linearly related to the input signal and a second video output signal non-linearly related to the video input signal. A first combining circuit combines the first and second video output signals in predetermined proportions to provide a third video output signal having both linear and non-linear components. A second combining means combines the second and third video output signals in proportions determined by an average picture level (APL) representative control signal to provide a processed video output signal having enhanced contrast for all values of the average picture level of displayed images.
20 Citations
3 Claims
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1. Video signal processing apparatus for use in a television system, comprising:
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a first input terminal for providing a video input signal to be processed; a second input terminal for providing a control signal representative of the average picture level (APL) of video signals displayed by said television system; signal processing means responsive to said video input signal for providing a first video output signal linearly related to said video input signal and for providing a second video output signal non-linearly related to said video input signal; first combining means for combining said first and second video output signals in predetermined proportions to provide a third video output signal having both linear and non-linear components; and second combining means for combining said second and third video output signals in proportions determined by said control signal for providing a processed video output signal. - View Dependent Claims (2, 3)
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Specification