Context-adaptive bandwidth adjustment in video rate control

Details Context-adaptive bandwidth adjustment in video rate control Context-adaptive bandwidth adjustment in video rate control

H - Electricity

04

N

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

Patent

CA 2600482

Methods and apparatus encode video at a targeted bit rate and yet permit variation of a Quantization Parameter (QP) to encode video of varying complexity with relatively consistent visual quality. Constant bit rate (CBR) encoding is desirable in many applications, such as in transmission or broadcasting environments. However, conventional CBR techniques compromise visual quality. Disclosed techniques permit adaptive variation in a QP value and provide the improved visual encoding available in variable bit rate (VBR) schemes while maintaining enough adherence to a targeted bit rate to be applicable to CBR environments.

Procédés et appareil qui permettent le codage de données vidéo à un débit binaire ciblé et qui permettent cependant la variation d'un paramètre de quantification (QP) pour coder des données vidéo de complexité variable avec une qualité visuelle relativement constante. Un codage à débit binaire constant (CBR) est souhaitable dans de nombreuses applications, tels que des environnements de transmission ou de diffusion. Toutefois, les techniques CBR classiques compromettent la qualité visuelle. Les techniques selon la présente invention permettent une variation adaptative d'une valeur QP et fournissent le codage visuel amélioré pouvant être obtenu dans les processus à débit binaire variable (VBR), tout en restant suffisamment proches d'un débit binaire ciblé pour être applicables à des environnements CBR.

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