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    • 5. 发明授权
    • Methods and devices for context set selection
    • 上下文集选择的方法和设备
    • US09584812B2
    • 2017-02-28
    • US13354485
    • 2012-01-20
    • Tianying JiNguyen NguyenDake He
    • Tianying JiNguyen NguyenDake He
    • H04N7/30H04N19/129H04N19/176H04N19/51H04N19/593
    • H04N19/129H04N19/176H04N19/184H04N19/186H04N19/51H04N19/593H04N19/60
    • Methods of encoding and decoding for video data are described for encoding or decoding multi-level significance maps. Distinct context sets may be used for encoding the significant-coefficient flags in different regions of the transform unit. In a fixed case, the regions are defined by coefficient group borders. In one example, the upper-left coefficient group is a first region and the other coefficient groups are a second region. In a dynamic case, the regions are defined by coefficient group borders, but the encoder and decoder dynamically determine in which region each coefficient group belongs. Coefficient groups may be assigned to one region or another based on, for example, whether their respective significant-coefficient-group flags were inferred or not.
    • 描述用于视频数据的编码和解码的方法用于对多级重要性图进行编码或解码。 不同的上下文集合可用于对变换单元的不同区域中的有效系数标记进行编码。 在固定情况下,区域由系数组边界定义。 在一个示例中,左上系数组是第一区域,其它系数组是第二区域。 在动态情况下,区域由系数组边界定义,但编码器和解码器动态地确定每个系数组属于哪个区域。 可以基于例如它们各自的有效系数组标志是否被推断来将系数组分配给一个区域或另一个区域。