Chroma quantization in video coding
摘要
說明書
That is, instead of sending the full offset parameter, i.e. chroma_cmp1_qp_offset[k], some embodiments send a delta parameter, i.e. delta_chroma_cmp1_qp_offset[k] for computing the offset for the second chroma QP offset chroma_cmp1_qp_offset[k].
There are other possible methods of predictively encoding the chroma QP offset table in order to reduce bit usage. For example, in some embodiments, the chroma QP offset table entries are predictively coded with respect to each other, such that all of the entries except one are predicted from other entries. One example is to encode each successive entry in the table after the first entry as a delta value predicted from a previous entry in the table. In some embodiments, the first entry is an explicit QP. In some embodiments, the first entry is itself an offset, and therefore is itself also a delta.
