Detecting block artifacts in coded images and video

H - Electricity – 04 – N

Patent

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H04N 7/64 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2674164

A method is provided for block artifact detection and block artifact determination using multiple features in coded images and video. A method includes identifying (910) a plurality of overlapping blocks in a picture with respect to a current block. Each of the plurality of overlapping blocks covers a portion of the current block and a portion of an adjacent block. The method further includes transforming (920) at least one of the plurality of overlapping blocks into respective coefficients corresponding to at least one of a luminance component and a chrominance component. The method also includes identifying (930) a blockartifact for the at least one of the plurality of overlapping blocks when coefficients corresponding to the at least one of the plurality of overlapping blocks are larger than a predefined value. Pixel domaine blockiness detection is also proposed, also in combination with the above transform domain analysis.

Cette invention concerne un procédé permettant de détecter des artéfacts de blocs et de déterminer des artéfacts de blocs au moyen de plusieurs caractéristiques dans des vidéo et des images codées. Un procédé selon l'invention consiste à identifier (910) plusieurs blocs chevauchants dans une image par rapport à un bloc en cours. Chacun des multiples blocs chevauchants recouvre une portion du bloc en cours et une portion d'un bloc adjacent. Le procédé consiste également à transformer (920) au moins l'un des multiples blocs chevauchants en coefficients respectifs correspondant à au moins un composant de luminance et à un composant de chrominance. Le procédé consiste également à identifier (930) un artéfact de blocs pour ledit bloc parmi les multiples blocs chevauchants lorsque les coefficients qui correspondent audit bloc parmi les multiples blocs chevauchants sont supérieurs à une valeur prédéfinie.

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