Video coder employing pixel transposition

H - Electricity – 04 – N

Patent

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Details

H04N 7/50 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01)

Patent

CA 2227495

A video encoding method and apparatus is shown wherein image information is represented as a plurality of pixels, the pixels are organized into blocks, pixels transposition is performed on image information at the boundaries of the blocks, the blocks are transform coded and quantized. Pixel transposition involves transposition of alternate pixels at the boundaries of blocks with pixels of neighboring blocks found in a pre-determined direction. The pre-determined direction may be fixed by a system or may be applied on an image by image basis. In the event that the pre-determined direction is not established by a system, a pixel transposition circuit includes a transposition keyword in the output bit stream which is used by a decoded to determine the direction of pixel transposition.

Méthode et dispositif de codage vidéo dans lesquels les données d'image sont représentées par un grand nombre de pixels, ceux-ci étant regroupés en blocs; la transposition des pixels s'effectue sur les données d'image aux limites des blocs; ces blocs sont codées par transformation et quantifiés. La transposition des pixels désigne la transposition de pixels en alternance aux limites des blocs, les pixels des blocs avoisinants étant relevés dans une direction prédéterminée. Cette direction peut être définie par un système ou image par image. Lorsque la direction prédéterminée n'est pas définie par un système, un circuit de transposition de pixels introduit un mot-clé de transposition dans le train de bits de sortie qui est ensuite décodé pour définir la direction de transposition des pixels.

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