Method of coding artefacts reduction
AssigneeSony International (Europe) GmbH
InventorsMiguel Estevez, Christian Unruh, Peter Wagner
Life of this patent
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Abstract
A method to reduce coding artefacts within a discrete decoded picture includes a spatial and/or temporal filtering with respective filter characteristics dependent on an image quality value (Q). Preferrably, said spatial filtering includes a deblocking filtering, wherein the deblocking filter operation decreases with an increasing image quality value (Q) and/or said deblocking filtering chooses a image quality value (Q) dependent weighting function for a pixel to be filtered according to an activity of both blocks to which common border said pixel belongs.
Claims16
Method to reduce coding artefacts within a discrete decoded picture, characterized by a spatial and/or temporal filtering with respective filter characteristics dependent on an image quality value (Q).
Method according to anyone of the preceding claims, characterized in that said spatial filtering includes a deringing filtering, wherein the deringing filter operation decreases with an increasing image quality value (Q).
Method according to anyone of the preceding claims, characterized in that the temporal filter operation decreases with an increasing image quality value (Q).
Method according to anyone of the preceding claims, characterized in that said image quality value (Q) is determined based on a quantization scaling factor (MQuant) used for encoding the picture.
Method according to anyone of the preceding claims, characterized in that said image quality value (Q) is determined based on a user selection.
Method according to anyone of the preceding claims, characterized in that said discrete encoding/decoding of the picture is based on a dicrete cosine transform.
Method according to anyone of the preceding claims, characterized in that said discrete encoding/decodeing of the picture is based on a MPEG coding scheme.
Dependencies are inferred from the claim text.