PALETTE CODING FOR SCREEN CONTENT CODING
Sketch copy mode may be used to code blocks comprising irregular lines, syntax redundancy may be removed from blocks with special characteristics, and/or run value coding may be simplified. The parsing dependencies in palette coding design may be removed. For example, the context modeling dependency of the syntax element palette_transpose_flag be removed, for example, by simplifying the corresponding context model. The context modeling of the syntax element palette mode may be removed, for example, by using run-length coding without using context. The syntax parsing dependencies and/or the syntax signaling dependencies that are related with escape color signaling may be removed. A palette table generation process may handle input screen content video with high bit depths, for example, at the encoder side.
1 - 20 . (canceled)
21 . A method for video decoding, the method comprising:
receiving a scan direction indication for a coding unit (CU) in video data, the scan direction indication indicating a palette coding scan direction associated with the CU, wherein the scan direction indication is coded with a single context; and
decoding the CU based on the first scan direction indication.
22 . The method of claim 21 , wherein a context value for decoding the scan direction indication for the CU is independent of a palette coding scan direction associated with another CU.
23 . The method of claim 21 , wherein the CU is a first CU, and a context value for decoding the scan direction indication for the first CU is independent of a palette coding scan direction associated with a second CU neighboring the first CU.
24 . The method of claim 21 , wherein the CU is a first CU, and the scan direction indication for the first CU is coded with a context that does not depend on a palette coding scan direction associated with a second CU neighboring the first CU.
25 . The method of claim 21 , wherein the scan direction indication for the CU is a palette transpose flag configured to indicate whether a horizontal traverse scan or a vertical traverse scan is applied for scanning palette indices of samples in the CU.
26 . The device for video decoding, comprising:
a processor configured to:
receive a scan direction indication for a coding unit (CU) in video data, the scan direction indication indicating a palette coding scan direction associated with the CU, wherein the scan direction indication is coded with a single context; and
decode the CU based on the scan direction indication.
27 . The device of claim 26 , wherein a context value for decoding the scan direction indication for the CU is independent of a palette coding scan direction associated with another CU.
28 . The device of claim 26 , wherein the CU is a first CU, and a context value for decoding the scan direction indication for the first CU is independent of a palette coding scan direction associated with a second CU neighboring the first CU.
29 . The device of claim 26 , wherein the CU is a first CU, and the scan direction indication for the first CU is coded with a context that does not depend on a palette coding scan direction associated with a second CU neighboring the first CU.
30 . The device of claim 26 , wherein the scan direction indication for the CU is a palette transpose flag configured to indicate whether a horizontal traverse scan or a vertical traverse scan is applied for scanning palette indices of samples in the CU.
31 . A method for video encoding, the method comprising:
determining a palette coding scan direction for a coding unit (CU); and
encoding a scan direction indication configured to indicate the determined palette coding scan direction associated with the CU, wherein the scan direction indication is coded with a single context.
32 . The method of claim 31 , wherein a context value for encoding the scan direction indication for the CU is independent of a palette coding scan direction associated with another CU.
33 . The method of claim 31 , wherein the CU is a first CU, and a context value for encoding the scan direction indication for the first CU is independent of a palette coding scan direction associated with a second CU neighboring the first CU.
34 . The method of claim 31 , wherein the CU is a first CU, and the scan direction indication for the first CU is coded with a context that does not depend on a palette coding scan direction associated with a second CU that neighbors the first CU.
35 . The method of claim 31 , wherein the scan direction indication for the CU is a palette transpose flag configured to indicate whether a horizontal traverse scan or a vertical traverse scan is applied for scanning palette indices of samples in the CU.
36 . The device for video encoding, comprising:
a processor configured to:
determine a palette coding scan direction for a coding unit (CU); and
encode a scan direction indication configured to indicate the determined palette coding scan direction associated with the CU, wherein the scan direction indication is coded with a single context.
37 . The device of claim 36 , wherein a context value for encoding the scan direction indication for the CU is independent of a palette coding scan direction associated with another CU.
38 . The device of claim 36 , wherein the CU is a first CU, and a context value for encoding the scan direction indication for the first CU is independent of a palette coding scan direction associated with a second CU neighboring the first CU.
39 . The device of claim 36 , wherein the CU is a first CU, and the scan direction indication for the first CU is coded with a context that does not depend on a palette coding scan direction associated with a second CU that neighbors the first CU.
40 . The device of claim 36 , wherein the scan direction indication for the CU is a palette transpose flag configured to indicate whether a horizontal traverse scan or a vertical traverse scan is applied for scanning palette indices of samples in the CU.