Digital filter for picture data and digital filter system

Details Digital filter for picture data and digital filter system Digital filter for picture data and digital filter system

1995-06-26

1997-06-10

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348624, 348625, 348630, H04N 521

Patent

active

056381344

ABSTRACT:
A digital filter for picture data is disclosed which has a first low-pass filter having relatively steep cut-off characteristics for filtering input digital picture data, a second low-pass filter having relatively moderate cut-off characteristics for filtering input digital picture data, a mixing unit for mixing digital picture data filtered by the first and second low-pass filters, a step detecting unit for detecting changes in step-like values of the input picture data, and a control unit for controlling the mixing ratio of the digital picture data from the first and second low-pass filters by the mixing unit based on step detection outputs of the step detection unit. There is also provided a digital filter system for color picture data having the digital filter for each color.

REFERENCES:
patent: 4825297 (1989-04-01), Fuchsberger
patent: 5392137 (1995-02-01), Okubo

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