Methods and systems for refinement coefficient coding in...

H - Electricity – 04 – N

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H04N 7/26 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2643705

A method for coding refinement coefficients in a signal-to-noise ratio (SNR) scalable enhancement layer of a compressed video sequence is disclosed. A video sequence is received. A prediction of an original video signal in a current frame is constructed from the video sequence. A residual signal is formed by subtracting the prediction of the original video signal from the original video signal in the current frame. A transform is applied to the residual signal. A plurality of transform coefficients is quantized. A refinement coefficient is mapped to a ternary refinement symbol. Refinement symbols are grouped in a certain coding order. The refinement symbol groups are coded using variable length codes.

L'invention porte sur un procédé de codage de coefficients de raffinement dans une couche d'enrichissement échelonnable à rapport signal/bruit (SNR) d'une séquence vidéo comprimée. Une prédiction d'un signal vidéo d'origine d'une trame courante est établie à partir de la séquence vidéo. Pour obtenir un signal résiduel, on soustrait la prédiction du signal vidéo d'origine du signal vidéo d'origine de la trame courante. On applique une transformée au signal résiduel et on quantifie une pluralité de coefficients de transformée. On met en concordance un coefficient de raffinement avec un symbole de raffinement ternaire. Des symboles de raffinement sont groupés dans un certain ordre de codage et ces groupes de symboles sont codés à l'aide de codes de longueur variable.

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