Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1995-07-24
1998-06-09
Grant, Christopher C.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348607, 382261, H04N 521
Patent
active
057643075
ABSTRACT:
The present invention provides a method (200) and an apparatus (100) for spatially adaptive filtering for video encoding. The apparatus filters a video sequence prior the encoding process. The apparatus comprises a noise variance determiner (102), a local variance determiner (104), a noise visibility function determiner (106), a Gaussian kernel determiner (108), and a convolver (110). The apparatus removes noise directly from a Displaced Frame Difference, DFD, signal. This novel approach removes noise and miscellaneous high frequency components from the DFD signal without the introduction of the filtering artifacts characteristic of current techniques. By reducing the miscellaneous high frequency components, the present invention is capable of reducing the amount of information that must be encoded by the video encoder without substantially degrading the decoded video sequence.
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Auyeung Cheung
Brailean James C.
Erdogan Ozan
Katsaggelos Aggelos K.
Ozcelik Taner
Grant Christopher C.
Motorola Inc.
Northwestern University
Stockley Darleen J.
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