Method and apparatus for spatially adaptive filtering for...

H - Electricity – 04 – N

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H04N 7/64 (2006.01) H04N 5/21 (2006.01) H04N 7/26 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2200730

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.

La présente invention se rapporte à un procédé (200) et à un appareil (100) de filtrage adaptatif tridimensionnel pour codage vidéo. L'appareil filtre une séquence vidéo avant le processus de codage. Il comprend un déterminant (102) de variation du bruit, un déterminant de variation local (104), un déterminant de la fonction de visibilité du bruit (106), un déterminant du noyau gaussien. L'appareil élimine directement le bruit à partir d'un signal de différence de trame déplacée (DFD). Cette nouvelle approche élimine le bruit et divers composants haute fréquence à partir du signal DFD sans introduire la caractéristique d'artéfacts de filtration des techniques courantes. En réduisant les divers composants haute fréquence, cette invention permet de réduire la quantité d'informations devant être codées par le codeur vidéo sans pratiquement dégrader la séquence vidéo codée.

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