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 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 to be coded with separate luma and chroma trees,
encoding a first component of the target CU based on the first palette entry, and
encoding a second component of the target CU based on a default palette entry.
2. The method of claim 1 , wherein receiving the first palette entry for palette coding the target CU comprises:
receiving a flag associated with a second palette entry; and
including the second palette entry in a palette predictor of the target CU based on the received flag.
3. The method of claim 2 , wherein a size of the palette predictor of the target CU is in a range of 0 to 63, inclusive.
4. The method of claim 1 , wherein receiving the first palette entry for palette coding the target CU comprises:
updating a palette predictor of the target CU based on the first palette entry.
5. The method of claim 1 , wherein determining whether the target CU is part of a single-tree slice comprises:
determining whether the target CU is part of a P slice or a B slice; or
determining whether the target CU is part of a single tree I slice.
6. The method of claim 5 , further comprising:
in response to the target CU being determined to be part of a P slice or a B slice or to be part of a single tree I slice, encoding the first and second components of the target CU based on the first palette entry.
7. The method of claim 1 , wherein:
the first component is a luma component and the second component is a chroma component; or
the first component is a chroma component and the second component is a luma component.
8. The method of claim 1 , wherein a palette predictor of the target CU is not updated after the first component and the second component are encoded.
9. A non-transitory computer readable medium storing a bitstream, wherein the bitstream comprises:
a first palette entry for palette coding a target coding unit (CU);
a default palette entry for palette coding the target CU;
an indicator, indicating whether the target CU is part of a single-tree slice and whether the target CU is coded with separate luma and chroma trees;
wherein in response to the indicator indicating that the target CU is part of a single-tree slice and is coded with separate luma and chroma trees,
a first component of the target CU is encoded based on the first palette entry; and
a second component of the target CU is encoded based on the default palette entry.
10. The non-transitory computer readable medium of claim 9 , wherein the bitstream further comprises:
a flag associated with a second palette entry; and
a palette predictor of the target CU including the second palette entry, based on the flag.
11. The non-transitory computer readable medium of claim 10 , wherein the bitstream further comprises:
a field indicating a size of the palette predictor of the target CU, in a range of 0 to 63, inclusive.
12. The non-transitory computer readable medium of claim 9 , wherein the bitstream further comprises:
a reuse flag indicating whether to reuse a palette entry to palette code the target CU, wherein no new palette entry is signaled for palette coding the target CU.
13. A video decoder capable of being enabled to implement a palette mode for a non 4:4:4 color format, the non 4:4:4 color format including at least one of a 4:2:0 color format, a 4:2:2 color format, or a monochrome color format, the video decoder comprising:
means for receiving a first palette entry for palette coding a target coding unit (CU);
means for determining whether the target CU is part of a single-tree slice;
means for determining whether the target CU is coded with separate luma and chroma trees; and
means for, 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,
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.