Method and apparatus for lossless encoding and decoding

H - Electricity – 04 – N

Patent

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H04N 7/32 (2006.01)

Patent

CA 2569625

A lossless moving picture encoding and decoding method and apparatus are provided by which when intra prediction of a block with a predetermined size is performed, the compression ratio is increased by using a pixel in a block to be predicted. The lossless moving picture encoding method includes: predicting each of pixel values in an M x N block to be predicted by using a pixel in the M x N block closest to the object pixel value in a prediction direction determined by an encoding mode; and entropy coding a difference between the predicted pixel value and the pixel value to be predicted. According to this method, the compression ratio becomes much higher than that of a conventional lossless encoding method.

L'intention concerne un procédé et un appareil de codage et de décodage d'image mobile sans perte, au moyen desquels le facteur de compression est accru à l'aide d'un pixel dans un bloc à prévoir, lors de la réalisation de la prévision interne d'un bloc doté d'une taille prédéterminée. Ce procédé de codage d'image mobile sans perte consiste à prévoir chacune des valeurs de pixel dans un bloc M x N à prévoir à l'aide d'un pixel dans le bloc M x N le plus proche de la valeur de pixel de l'objet dans une direction de prévision déterminée par un mode de codage, et à coder par entropie une différence entre la valeur de pixel prévue et la valeur de pixel à prévoir. Selon ce procédé, le facteur de compression devient plus élevé que celui d'un procédé de codage sans perte traditionnel.

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