Method, device, and storage medium for data encoding/decoding
A data encoding method includes obtaining an attribute residual of a current point cloud point, binarizing the attribute residual to obtain a binary code of the current point cloud point that includes a first binary code indicating a first flag bit and a second binary code indicating a second flag bit, selecting a first context model from a context model list according to a first condition, selecting a second context model from the context model list according to a second condition, encoding the first binary code using the first context model, and encoding the second binary code using the second context model. The first condition and the second condition are different for the first context model and the second context model corresponding to a same index in the context model list.
1. A data encoding method comprising:
obtaining an attribute residual of a current point cloud point;
binarizing the attribute residual to obtain a binary code of the current point cloud point, the binary code of the current point cloud point including a first binary code indicating a first flag bit and a second binary code indicating a second flag bit;
selecting a first context model from a context model list;
selecting a second context model from the context model list, the first context model and the second context model being different models;
encoding the first binary code using the first context model; and
encoding the second binary code using the second context model.
2. The method according to claim 1 , wherein:
the attribute residual of the current point cloud point includes a first attribute residual of a first channel of the current point cloud point, a second attribute residual of a second channel of the current point cloud point, and a third attribute residual of a third channel of the current point cloud point; and
the binary code of the current point cloud point includes a binary code of the first attribute residual, a binary code of the second attribute residual, and a binary code of the third attribute residual.
3. The method according to claim 1 , wherein:
the first context model and the second context model are used to encode different flag bits of the attribute residual of a same channel of the current point cloud point.
4. The method according to claim 1 , wherein:
the first flag bit indicates whether an attribute residual of a channel of the current point cloud point is N+1, N being greater than or equal to 0; and
the second flag bit indicates whether the attribute residual of the channel of the current point cloud point is N.
5. The method according to claim 1 , wherein:
the attribute residual of the current point cloud point includes a first attribute residual of a first channel of the current point cloud point and a second attribute residual a second channel of the current point cloud point; and
selecting the first context model include:
selecting the first context model for encoding the first binary code of the first flag bit of the second attribute residual from the context model list according to whether the first attribute residual is larger than a preset threshold, the preset threshold being larger than 0.
6. The method according to claim 5 , wherein selecting the first context model for encoding the first binary code of the first flag bit of the second attribute residual includes:
in response to the first attribute residual being larger than the preset threshold, selecting a context model corresponding to a first index as the first context model for encoding the first binary code of the first flag bit of the second attribute residual; and
in response to the first attribute residual being not larger than the preset threshold, selecting a context model corresponding to a second index as the first context model for encoding the first binary code of the first flag bit of the second attribute residual.
7. The method according to claim 5 , wherein:
the preset threshold is a first preset threshold; and
selecting the second context model includes:
selecting the second context model for encoding the second binary code of the second flag bit of the second attribute residual from the context model list according to whether the first attribute residual is equal to a second preset threshold.
8. The method according to claim 5 , wherein selecting the first context model for encoding the first binary code of the first flag bit of the second attribute residual includes:
determining whether the first attribute residual and a third attribute residual of a third channel of the current point cloud point are larger than the preset threshold, to obtain a determination result; and
selecting the first context model for encoding the first binary code of the first flag bit of the second attribute residual from the context model list according to the determination result.
9. The method according to claim 8 , wherein selecting the first context model for encoding the first binary code of the first flag bit of the second attribute residual according to the determination result includes:
in response to the first attribute residual being smaller than or equal to the preset threshold and the third attribute residual being smaller than or equal to the preset threshold, selecting a context model corresponding to a first index as the first context model for encoding the first binary code of the first flag bit of the second attribute residual;
in response to the first attribute residual being smaller than or equal to the preset threshold and the third attribute residual being larger than the preset threshold, selecting a context model corresponding to a second index as the first context model for encoding the first binary code of the first flag bit of the second attribute residual;
in response to the first attribute residual being larger than the preset threshold and the third attribute residual being smaller than or equal to the preset threshold, selecting a context model corresponding to a third index as the first context model for encoding the first binary code of the first flag bit of the second attribute residual; and
in response to the first attribute residual being larger than the preset threshold and the third attribute residual being larger than the preset threshold, selecting a context model corresponding to a fourth index as the first context model for encoding the first binary code of the first flag bit of the second attribute residual.
10. A data decoding method comprising:
obtaining bitstream data of a current point cloud point, the bitstream data including bitstream data of a first flag bit and bitstream data of a second flag bit;
selecting a first context model from a context model list;
decoding the bitstream data of the first flag bit using the first context model to obtain a first binary code indicating the first flag bit;
selecting a second context model from the context model list;
decoding the bitstream data of the second flag bit using the second context model to obtain a second binary code indicating the second flag bit; and
performing inverse binarization on the first binary code and the second binary code to obtain an attribute residual of the current point cloud point.
11. The method according to claim 10 , wherein:
the attribute residual of the current point cloud point includes a first attribute residual of a first channel of the current point cloud point, a second attribute residual of a second channel of the current point cloud point, and a third attribute residual of a third channel of the current point cloud point; and
the bitstream data includes bitstream data of the first attribute residual, bitstream data of the second attribute residual, and bitstream data of the third attribute residual.
12. The method according to claim 10 , wherein:
the first context model and the second context model are used to decode bitstream data of different flag bits of the attribute residual of a same channel of the current point cloud point.
13. The method according to claim 10 , wherein:
the first flag bit indicates whether an attribute residual of a channel of the current point cloud point is N+1, N being greater than or equal to 0; and
the second flag bit indicates whether the attribute residual of the channel of the current point cloud point is N.
14. The method according to claim 10 , wherein:
the attribute residual of the current point cloud point includes a first attribute residual of a first channel of the current point cloud point and a second attribute residual of a second channel of the current point cloud point;
the bitstream data includes bitstream data of the first attribute residual and bitstream data of the second attribute residual; and
selecting the first context model includes:
decoding the bitstream data of the first attribute residual to obtain the first attribute residual; and
selecting the first context model for decoding the bitstream data of the first flag bit of the second attribute residual from the context model list according to whether the first attribute residual is larger than a preset threshold, the preset threshold being larger than 0.
15. The method according to claim 14 , wherein selecting the first context model for decoding the bitstream data of the first flag bit of the second attribute residual includes:
in response to the first attribute residual being larger than the preset threshold, selecting a context model corresponding to a first index as the first context model for decoding the bitstream data of the first flag bit of the second attribute residual; and
in response to the first attribute residual being not larger than the preset threshold, selecting a context model corresponding to a second index as the first context model for decoding the bitstream data of the first flag bit of the second attribute residual.
16. The method according to claim 14 , wherein:
the preset threshold is a first preset threshold; and
selecting the second context model includes:
selecting the second context model decoding the bitstream data of the second flag bit of the second attribute residual from the context model list according to whether the first attribute residual is equal to a second preset threshold.
17. The method according to claim 14 , wherein selecting the first context model for decoding the bitstream data of the first flag bit of the second attribute residual includes:
determining whether the first attribute residual and a third attribute residual of a third channel of the current point cloud point are larger than the preset threshold to obtain a determination result; and
selecting the first context model for decoding the bitstream data of the first flag bit of the second channel from the context model list according to the determination result.
18. The method according to claim 17 , wherein selecting the first context model for decoding the bitstream data of the first flag bit of the second channel according to the determination result includes:
in response to the first attribute residual being smaller than or equal to the preset threshold and the third attribute residual being smaller than or equal to the preset threshold, selecting a context model corresponding to a first index as the first context model for decoding the bitstream data of the first flag bit of the second attribute residual;
in response to the first attribute residual being smaller than or equal to the preset threshold and the third attribute residual being smaller than or equal to the preset threshold, selecting a context model corresponding to a first index as the first context model for decoding the bitstream data of the first flag bit of the second attribute residual;
in response to the first attribute residual being larger than the preset threshold and the third attribute residual being smaller than or equal to the preset threshold, selecting a context model corresponding to a third index as the first context model for decoding the bitstream data of the first flag bit of the second attribute residual; and
in response to the first attribute residual being larger than the preset threshold and the third attribute residual being larger than the preset threshold, selecting a context model corresponding to a fourth index as the first context model for decoding the bitstream data of the first flag bit of the second attribute residual.
19. A data encoding device comprising:
a memory storing a program; and
a processor configured to execute the program to:
obtain an attribute residual of a current point cloud point;
binarize the attribute residual to obtain a binary code of the current point cloud point, the binary code of the current point cloud point including a first binary code indicating a first flag bit and a second binary code indicating a second flag bit;
select a first context model from a context model list;
select a second context model from the context model list, the first context model and the second context model being different models;
encode the first binary code using the first context model; and
encode the second binary code using the second context model.
20. The device according to claim 19 , wherein:
the first flag bit indicates whether an attribute residual of a channel of the current point cloud point is N+1, N being greater than or equal to 0; and
the second flag bit indicates whether the attribute residual of the channel of the current point cloud point is N.