Apparatus for shifting the DC level of a luminance signal based

Details Apparatus for shifting the DC level of a luminance signal based Apparatus for shifting the DC level of a luminance signal based

1993-03-24

1994-06-14

Groody, James J.

Television

Image signal processing circuitry specific to television

Dc insertion

348674, H04N 516

Patent

active

053215133

ABSTRACT:
A video signal processing circuit includes a level shifter for shifting the dc level of an input luminance signal; a gain adjuster for increasing the gain for the luminance signal when the luminance signal has a low luminance level and for decreasing the gain for the luminance signal when the luminance signal has a high luminance level; and a shifting amount setting unit for setting the amount for shifting the dc level on the basis of the frequency distribution of the luminance signal and the rate of modulation of the luminance signal.

REFERENCES:
patent: 4751577 (1988-06-01), Kawai
patent: 4799106 (1989-01-01), Moore

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