Contour restoration apparatus

Details Contour restoration apparatus Contour restoration apparatus

1993-02-25

1996-08-13

Chin, Tommy P.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348675, 348677, 348 26, H04N 557

Patent

active

055461352

ABSTRACT:
A contour restoration circuit comprises an input terminal, a plural of delay circuits connected to the input terminal in series, a maximum value detection circuit, a minimum value detection circuit, a mean value calculating the mean value from the maximum and minimum values, a subtractor for subtracting the mean value from the input video signal, a gain controller for the subtracted signal, an adder for adding the gain controlled signal to the input video signal and an output terminal.

REFERENCES:
patent: 4823194 (1989-04-01), Mishima et al.
patent: 4853783 (1989-08-01), Ozaki
patent: 4918528 (1990-04-01), Oohashi
patent: 4942463 (1990-07-01), Hopkins
patent: 4994915 (1991-02-01), Takahashi et al.
patent: 5001553 (1991-03-01), Matsuo et al.
patent: 5121209 (1992-06-01), Smith et al.
patent: 5151787 (1992-09-01), Park

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