# US 12,015,788 B2 · Video processing method and apparatus for using palette mode > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,788 B2 - Document ID: US12015788B2 - Status: Granted - Kind: B2 - Application number: 17/932,841 - Filed: 2022-09-16 - Published: 2023-01-12 - Granted: 2024-06-18 - Earliest claimed: 2019-12-03 - Assignees: Alibaba Group Holding Limited - Applicants: Alibaba Group Holding Limited - Inventors: Mohammed Golam Sarwer; Ru-Ling Liao; Yan Ye; Jiancong Luo; Jie Chen - Web page: https://patentgrep.com/patent/US12015788B2 ## CPC - H04N 19/157: Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter - H04N 19/174: the region being a slice, e.g. a line of blocks or a group of blocks - H04N 19/105: Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction - H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction - H04N 19/182: the unit being a pixel - H04N 19/186: the unit being a colour or a chrominance component - H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards - H04N 19/96: Tree coding, e.g. quad-tree coding - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 2) 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. ### Claim 4 (depends on 1) 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. ### Claim 5 (depends on 1) 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. ### Claim 6 (depends on 5) 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. ### Claim 7 (depends on 1) 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. ### Claim 8 (depends on 1) 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. ### Claim 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. ### Claim 10 (depends on 9) 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. ### Claim 11 (depends on 10) 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. ### Claim 12 (depends on 9) 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. ### Claim 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.