Non-linear luminance signal processor responsive to average picture level (APL) of displayed image
AssigneeThomson Consumer Electronics, Inc.
InventorsIsaac M. Bell, William A. Lagoni
Life of this patent
Estimating the term…
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.
Claims3
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.
Dependencies are inferred from the claim text.