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摘要

A method of signaling additional chroma QP offset values that are specific to quantization groups is provided, in which each quantization group explicitly specifies its own set of chroma QP offset values. Alternatively, a table of possible sets of chroma QP offset values is specified in the header area of the picture, and each quantization group uses an index to select an entry from the table for determining its own set of chroma QP offset values. The quantization group specific chroma QP offset values are then used to determine the chroma QP values for blocks within the quantization group in addition to chroma QP offset values already specified for higher levels of the video coding hierarchy.

說明書

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FIG. 16 illustrates example segmentation and categorization of an image 1600. The image is divided into coding tree units, and each coding tree unit is sub-divided into coding units. The various coding units of the image 1600 are divided into four different chroma QP offset groups. In some embodiments, the four different chroma QP offset groups are signaled in the PPS and the encoder can select the appropriate group to be signaled at the quantization group level. In some embodiments, the chroma QP offsets are explicitly signaled within each quantization group at the time of encoding.

The choice of a chroma QP offset value is determined by the relative visual complexities or textures among the luma and chroma components. The quantization groups of the image 1600 are assigned to different categories 1611-1614 according to their texture levels. For example, areas that appear as flat across all color components belong to a first category 1611, flat luma areas with high texture color components belong to a second category 1612, high texture luma areas with flat color information belong to a third category 1613, while areas with high texture across all three components belong to a fourth category 1614. The encoder in some embodiments may create additional subcategories for each category based on motion and intensity. In some embodiments, additional categorizations are made by taking into account the differences between the two chroma components themselves.

權(quán)利要求

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Chroma quantization in video coding

摘要

說明書

權(quán)利要求

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Chroma quantization in video coding

摘要

說明書

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