Image signal processing device capable of suppressing nonuniform

Details Image signal processing device capable of suppressing nonuniform Image signal processing device capable of suppressing nonuniform

1992-04-03

1994-08-30

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348 71, 348252, 348678, H04N 521

Patent

active

053432541

ABSTRACT:
An image signal processing device includes a logarithmic compression circuit, filtering circuit, filtering characteristic setting circuit and dynamic range/gain control circuit. The logarithmic compression circuit subjects an input image signal containing a color signal to the logarithmic compression. The filtering circuit serves to filter the input image signal. The filtering characteristic setting circuit adaptively sets the band pass characteristic of the filtering circuit according to the feature of the input image signal. The dynamic range/gain control circuit controls the dynamic range and gain of the filtered input image signal.

REFERENCES:
patent: 4584606 (1986-04-01), Nagasaki
patent: 4926247 (1990-05-01), Nagasaki et al.
patent: 5034888 (1991-07-01), Uehara et al.

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