Adaptive field/frame filter for interlaced video signals

Details Adaptive field/frame filter for interlaced video signals Adaptive field/frame filter for interlaced video signals

1992-09-30

1994-07-12

Chin, Tommy P.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348607, 348618, H04N 712, H04N 512

Patent

active

053293177

ABSTRACT:
A motion adaptive vertical filter is used to filter an interlaced video signal on a frame basis in areas of the image that are not in motion and on a field basis in areas that are in motion. A soft switch mixes the field filtered data and the frame filtered data in areas where there is relatively little motion to prevent artifacts which may be caused by abruptly switching between the two vertical filtering schemes. The frame vertical filter reduces the vertical resolution of still NTSC images to 180 cycles per picture height (CPH) while the field filter reduces the vertical resolution to 90 CPH.

REFERENCES:
patent: 5150207 (1992-09-01), Someya
patent: 5185664 (1993-02-01), Darby

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