String matching with single color value

1. A method of decoding an encoded video bitstream using at least one processor, the method comprising:

determining, based on the encoded video bitstream, that a single-value string matching mode is enabled;

obtaining, from the encoded video bitstream, an index indicating a reference sample within a set including a plurality of reference samples, wherein the set includes reconstructed samples which spatially neighbor the current block;

based on the reference sample indicated by the index, determining a color value to be used for samples included in a current string of a current block;

reconstructing the samples included in the current string based on the determined color value; and

reconstructing the current block using the reconstructed current string.

2. The method of claim 1 , wherein the current string comprises a plurality of samples which are continuously located along a scan line within the current block.

3. The method of claim 1 , wherein the reconstructed samples are selected from representative locations which are located at least one of above the current block or to a left of the current block.

4. The method of claim 3 , wherein the representative locations are not immediately adjacent to the current block.

5. The method of claim 1 , wherein the set includes a last sample of a previous string of the current block.

6. The method of claim 5 , wherein the last sample of the previous string is included within the set at a predetermined position of the set.

7. The method of claim 1 , wherein the set is stored in a buffer having a fixed size.

8. A device for decoding an encoded video bitstream, the device comprising:

at least one memory configured to store program code; and

at least one processor configured to read the program code and operate as instructed by the program code, the program code including:

first determining code configured to cause the at least one processor to determine, based on the encoded video bitstream, that a single-value string matching mode is enabled;

obtaining code configured to cause the at least one processor to obtain, from the encoded video bitstream, an index indicating a reference sample within a set including a plurality of reference samples, wherein the set includes reconstructed samples which spatially neighbor the current block;

second determining code configured to cause the at least one processor to, based on the reference sample indicated by the index, determine a color value to be used for samples included in a current string of a current block;

first reconstructing code configured to cause the at least one processor to reconstruct the samples included in the current string based on the determined color value; and

second reconstructing code configured to cause the at least one processor to reconstruct the current block using the reconstructed current string.

9. The device of claim 8 , wherein the current string comprises a plurality of samples which are continuously located along a scan line within the current block.

10. The device of claim 8 , wherein the reconstructed samples are selected from representative locations which are located at least one of above the current block or to a left of the current block.

11. The device of claim 10 , wherein the representative locations are not immediately adjacent to the current block.

12. The device of claim 8 , wherein the set includes a last sample of a previous string of the current block.

13. The device of claim 12 , wherein the last sample of the previous string is included within the set at a predetermined position of the set.

14. The device of claim 8 , wherein the set is stored in a buffer having a fixed size.

15. A non-transitory computer-readable medium storing instructions, the instructions comprising: one or more instructions that, when executed by one or more processors of a device for decoding an encoded video bitstream, cause the one or more processors to:

determine, based on the encoded video bitstream, that a single-value string matching mode is enabled;

obtain, from the encoded video bitstream, an index indicating a reference sample within a set including a plurality of reference samples, wherein the set includes reconstructed samples which spatially neighbor the current block;

based on the reference sample indicated by the index, determine a color value to be used for samples included in a current string of a current block;

reconstruct the samples included in the current string based on the determined color value; and

reconstruct the current block using the reconstructed current string.

16. The non-transitory computer-readable medium of claim 15 , wherein the set includes a last sample of a previous string of the current block.

17. The non-transitory computer-readable medium of claim 15 , wherein the set is stored in a buffer having a fixed size.