Method and system for improving compressed image chroma...

Details Method and system for improving compressed image chroma... Method and system for improving compressed image chroma...

H - Electricity

04

N

H04N 7/12 (2006.01) H04N 7/26 (2006.01) H04N 9/68 (2006.01) H04N 11/02 (2006.01)

Patent

CA 2452506

Methods, systems, and computer programs for improving compressed image chroma information. In one aspect of the invention, a resolution for a red color component of a color video image is used that is higher than the resolution for a blue color component of the color video image. Another aspect includes utilizing a lower or higher value of a quantization parameter (QP) for one or more chroma channels as compared to the luminance channel. Another aspect is use of a logarithmic representation of a video image to benefit image coding. Another aspect uses more than two chroma channels to represent a video image.

Cette invention concerne des procédés, des systèmes et des programmes informatiques qui permettent d'améliorer des informations de chrominance sur des images compressées. Dans un aspect de l'invention, on utilise pour un composant de couleur rouge d'une image vidéo couleur une résolution plus élevée que pour un composant de couleur bleue. Dans un autre aspect de l'invention, on utilise une valeur plus faible ou plus élevée de paramètre de quantification pour un ou plusieurs canaux de chrominance que pour le canal de luminance. Selon un autre aspect, l'utilisation d'une représentation algorithmique d'une image vidéo favorise le codage de l'image. Selon un autre aspect encore, on utilise plus de deux canaux de chrominance pour représenter une image vidéo.

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