Animation encoding method, animation decoding method,...

H - Electricity – 04 – N

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Details

H04N 7/50 (2006.01) H04N 7/26 (2006.01) H04N 7/46 (2006.01) H04N 9/804 (2006.01)

Patent

CA 2153407

In an animation encoding method, an animation decoding method, an animation recording medium and an animation encoder, the present invention suppresses the reduction of information having a fine image pattern while reducing a mosquito noise even in a signal band in which an S/N ratio is low. An animation signal is encoded by using a predetermined anticipation image signal, applying a predetermined operation to the signal so encoded, quantizing the signal obtained by the operation and the signal so quantized is subjected to variable length encoding. In this instance, the signal band in which the S/N ratio of the image signal drops is quantized and highlighted on the basis of non-linear characteristics. On the decoding side, on the other hand, decoded signals are reversely quantized on the basis of non-linear characteristics having opposite characteristics to the encoding side, and decoding is effected.

Concernant un procédé de codage et de décodage d'animation ainsi qu'un support d'enregistrement et un codeur d'animation, l'invention supprime la réduction des informations qui présentent un motif d'image fin tout en réduisant le bruit de "moustique" même dans une bande de signal où le rapport signal sur bruit est bas. Un signal d'animation est codé grâce à l'utilisation d'un signal d'image anticipé prédéterminé, à l'application d'une opération prédéterminée au signal ainsi codé, et à la quantification du signal, obtenu par cette opération, signal qui est ensuite soumis à un codage à longueur variable. En l'occurence, la bande de signal, où le rapport signal sur bruit du signal d'image faiblit, est quantifiée et amplifiée en fonction de caractéristiques non linéaires. D'autre part, pour permettre le décodage, les signaux décodés sont quantifiés de manière inversée en fonction de caractéristiques non linéaires inverses de celles du codage.

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