Method and system for analog video noise reduction by...

Details Method and system for analog video noise reduction by... Method and system for analog video noise reduction by...

2005-12-20

2009-12-29

Tran, Trang U (Department: 2622)

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

C348S620000, C348S701000

Reexamination Certificate

active

07639309

ABSTRACT:
A method and system for analog video noise reduction by blending finite impulse response (FIR) and infinite impulse response (IIR) filtering are provided. A filtering mode may be selected to generate noise-reduced pixels using FIR, IIR, or a blend of FIR/IIR filtering. Blending a current pixel and an FlR-filtered current pixel may generate a first blended current pixel. The FIR filtering may be based on the current pixel, a previous collocated pixel, and a next collocated pixel. Blending the current pixel and an IIR-filtered current pixel may generate a second blended current pixel. Blending the first blended current pixel and the second blended current pixel using an adaptive blending factor may dynamically generate a filtered output pixel. The IIR filtering may be based on the current pixel and a collocated pixel of the previous second blended video image or of the previous filtered output video image.

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patent: 7391933 (2008-06-01), Wang et al.
patent: 7551232 (2009-06-01), Winger et al.

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