Interpolation-like filtering of integer-pixel positions in...

H - Electricity – 04 – N

Patent

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H04N 7/50 (2006.01)

Patent

CA 2719404

This disclosure describes filtering techniques applied by an encoder and a decoder during the prediction stage of a video encoding and/or decoding process. The filtering techniques may enhance the accuracy of predictive data used during fractional interpolation, and may improve predictive data of integer blocks of pixels. There are several aspects to this disclosure, including a useful twelve -pixel filter support that may be used for interpolation, techniques that use coefficient symmetry and pixel symmetry to reduce the amount of data needed to be sent between an encoder and a decoder to configure the filter support for interpolation, and techniques for filtering data at integer pixel locations in a manner that is similar to sub-pixel interpolation. Other aspects of this disclosure concern techniques for encoding information in the bitstream to convey the type of filter used, and possibly the filter coefficients used. Predictive coding of filter coefficients is also described.

La présente invention concerne des techniques de filtrage appliquées par un codeur et un décodeur au cours de létape de prédiction dun processus de codage et / ou de décodage vidéo. Les techniques de filtrage sont susceptibles daméliorer la précision des données prédictives utilisées lors dune interpolation fractionnaire, et daméliorer les données prédictives de blocs entiers de pixels. Entre autres aspects de linvention, on décrit un support de filtre sur douze pixels susceptible dêtre utilisé avantageusement pour linterpolation, des techniques qui utilisent la symétrie des coefficients et la symétrie des pixels pour réduire la quantité de données quil est nécessaire denvoyer entre un codeur et un décodeur en vue de configurer le support de filtre pour linterpolation, et des techniques visant à filtrer les données à des emplacements de pixels entiers dune manière similaire à linterpolation sous-pixel. Dautres aspects de la présente invention concernent des techniques de codage dinformations dans le flux binaire afin dacheminer le type de filtre utilisé, et éventuellement les coefficients de filtrage utilisés. L'invention concerne également le codage prédictif des coefficients de filtrage.

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