CHROMA PROCESSING FOR VIDEO ENCODING AND DECODING

Encoding or decoding picture information can involve determining a first scaling factor varying with a first granularity to scale a chroma prediction residual associated with chroma information included in the picture information; determining a second scaling factor varying with a second granularity finer than the first granularity; scaling the chroma prediction residual based on a combination of the first scaling factor and the second scaling factor to provide a scaled chroma prediction residual with the second granularity; and encoding or decoding at least a portion of the picture information based on the scaled chroma prediction residual. 对画面信息进行编码或解码可涉及确定随第一粒度变化用于缩放与包括在所述画面信息中的色度信息相关联的色度预测残差的第一缩放因子；确定随比所述第一粒度更细的第二粒度变化的第二缩放因子；基于所述第一缩放因子和所述第二缩放因子的组合缩放所述色度预测残差，以提供具有所述第二粒度的缩放的色度预测残差；以及基于所述缩放的色度预测残差对所述画面信息的至少一部分进行编码或解码。