Picture aperture correction circuit

Details Picture aperture correction circuit Picture aperture correction circuit

1991-09-24

1993-06-08

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 96, H04N 5208, H04N 514

Patent

active

052184382

ABSTRACT:
A picture aperture correction circuit compensates aperture signal strength to add the compensated aperture component to the video signal. The circuit comprises an input terminal for entering a luminance signal, an aperture signal detector for detecting an aperture signal from the luminance signal supplied to the input terminal, an aperture level regulator to regulate the aperture signal to have variation of a specified slope, a level limiter section to limit the levels of the regulated signal to a specified level, a first adder that adds the limited level aperture signal to the detected aperture signal, and a second adder that adds the luminance signal supplied at the input terminal with the aperture signal from the first adder and generates an aperture corrected luminance signal.

REFERENCES:
patent: 3789133 (1974-01-01), Kline
patent: 4142211 (1979-02-01), Faroudja
patent: 4360830 (1982-11-01), Poetsch et al.
patent: 4839725 (1989-06-01), Ueda

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