Video processing method and apparatus for using palette mode
The present disclosure provides systems and methods for signaling and using a palette mode in video processing. According to certain disclosed embodiments, an exemplary video processing method includes: receiving a first palette entry for palette coding a target coding unit (CU); determining whether the target CU is part of a single-tree slice; determining whether the target CU is coded with separate luma and chroma trees; and in response to the target CU being determined to be part of a single-tree slice and be coded with separate luma and chroma trees, decoding a first component of the target CU based on the first palette entry, and decoding a second component of the target CU based on a default palette entry.
1. A video processing method, comprising:
receiving a flag indicating that a palette mode is enabled for a target coding unit (CU), wherein the flag is signaled regardless of whether a chroma sampling format is used for the target CU; and
decoding, in response to the target CU being determined to be part of a single-tree slice and be coded with separate luma and chroma trees, the target CU using the palette mode.
2. The method of claim 1 , wherein the flag is signaled in a sequence parameter set (SPS).
3. The method of claim 1 , wherein the chroma sampling format comprises one or more of:
a 4:4:4 format,
a 4:2:2 format, or
a 4:2:0 format.
4. A video processing method, comprising:
signaling a flag indicating that a palette mode is enabled for a target coding unit (CU), wherein the flag is signaled regardless of whether a chroma sampling format is used for the target CU; and
encoding, in response to the target CU being determined to be part of a single-tree slice and to be coded with separate luma and chroma trees, the target CU using the palette mode.
5. The method of claim 4 , wherein the flag is signaled in a sequence parameter set (SPS).
6. The method of claim 4 , wherein the chroma sampling format comprises one or more of:
a 4:4:4 format,
a 4:2:2 format, or
a 4:2:0 format.
7. A non-transitory computer readable medium storing a bitstream, wherein the bitstream comprises:
a flag indicating that a palette mode is enabled for a target coding unit (CU), wherein the flag is present regardless of whether a chroma sampling format is used for the target CU; and
data representing the target CU, wherein the data is decoded using the palette mode in response to the target CU being determined to be part of a single-tree slice and be coded with separate luma and chroma trees.
8. The non-transitory computer readable storage medium of claim 7 , wherein the flag is signaled in a sequence parameter set (SPS).
9. The non-transitory computer readable storage medium of claim 7 , wherein the chroma sampling format comprises one or more of:
a 4:4:4 format,
a 4:2:2 format, or
a 4:2:0 format.