Method and apparatus using homogeneous syntax with coding tools
Flexible methods to use a combination of coding modes while keeping good performance tradeoff are implemented with embodiments that determine coding mode information. In one embodiment, determination is made of activation of a first coding mode, and upon determination of whether a second coding mode is used, coding or decoding using the determined modes occurs. Other embodiments enable use of multiple reference lines, intra sub-block partitioning, matrix intra prediction, and low frequency non-separable transforms.
1. A method, comprising:
determining whether to activate a first coding tool for encoding a portion of a video image;
determining whether a second coding tool is activated for encoding the portion of the video image;
performing at least one of said coding tools responsive to the determinations;
encoding a first syntax element indicating whether the first coding tool is activated; and
encoding a second syntax element indicating whether the second coding tool is activated, said second syntax element being encoded using a first context bin in a case where the first syntax element indicates the first coding tool is activated and a second context bin otherwise, the second context bin being different from the first context bin.
2. A non-transitory computer readable medium containing data content generated according to the method of claim 1 for playback using a processor.
3. A non-transitory computer program product comprising stored instructions which, when the program is executed by a computer, cause the computer to carry out the method of claim 1 .
4. The method of claim 1 , wherein the first context bin used when the first coding tool is activated is initialized with a low probability.
5. The method of claim 1 , wherein the first coding tool is matrix intra prediction with block size less than a value and the second coding tool is Low Frequency Non-Separable Transform.
6. The method of claim 1 , wherein the first coding tool is skip mode and the second coding tool is Combined Intra-Inter Prediction.
7. The method of claim 1 , wherein the first coding tool is multiple reference lines and the second coding tool is intra sub-block partitioning.
8. An apparatus, comprising:
a processor, configured to:
determine whether to activate a first coding tool for encoding a portion of a video image;
determine whether a second coding tool is activated for encoding the portion of the video image;
perform at least one of said coding tools responsive to the determinations;
encode a first syntax element indicating whether the first coding tool is activated; and
encode a second syntax element indicating whether the second coding tool is activated, said second syntax element being encoded using a first context bin in a case where the first syntax element indicates the first coding tool is activated and a second context bin otherwise, the second context bin being different from the first context bin.
9. The apparatus of claim 8 , wherein the first context bin used when the first coding tool is activated is initialized with a low probability.
10. The apparatus of claim 8 , wherein the first coding tool is matrix intra prediction with block size less than a value and the second coding tool is Low Frequency Non-Separable Transform.
11. The apparatus of claim 8 , wherein the first coding tool is skip mode and the second coding tool is Combined Intra-Inter Prediction.
12. The apparatus of claim 8 , wherein the first coding tool is multiple reference lines and the second coding tool is intra sub-block partitioning.
13. A method, comprising:
decoding a first syntax element indicating whether a first decoding tool is activated;
decoding a second syntax element indicating whether a second decoding tool is activated, said second syntax element being decoded using a first context bin in a case where the first syntax element indicates the first decoding tool is activated and a second context bin otherwise, the second context bin being different from the first context bin; and
performing at least one of said decoding tools based on the decoded first and second syntax elements.
14. A non-transitory computer program product comprising stored instructions which, when the program is executed by a computer, cause the computer to carry out the method of claim 13 .
15. The method of claim 13 , wherein the first context bin used when the first decoding tool is activated is initialized with a low probability.
16. The method of claim 13 , wherein the first decoding tool is matrix intra prediction with block size less than a value and the second decoding tool is Low Frequency Non-Separable Transform.
17. The method of claim 13 , wherein the first decoding tool is skip mode and the second decoding tool is Combined Intra-Inter Prediction.
18. The method of claim 13 , wherein the first decoding tool is multiple reference lines and the second decoding tool is intra sub-block partitioning.
19. An apparatus, comprising:
a processor, configured to:
decode a first syntax element indicating whether a first decoding tool is activated;
decode a second syntax element indicating whether a second decoding tool is activated, said second syntax element being decoded using a first context bin in a case where the first syntax element indicates the first decoding tool is activated and a second context bin otherwise, the second context bin being different from the first context bin; and
perform at least one of said decoding tools based on the decoded first and second syntax elements.
20. A device comprising:
the apparatus according to claim 19 ; and
at least one of:
an antenna configured to receive a signal, the signal including a video block;
a band limiter configured to limit the received signal to a band of frequencies that includes the video block, or
a display configured to display an output representative of the video block.
21. The apparatus of claim 19 , wherein the first context bin used when the first decoding tool is activated is initialized with a low probability.
22. The apparatus of claim 19 , wherein the first decoding tool is matrix intra prediction with block size less than a value and the second decoding tool is Low Frequency Non-Separable Transform.
23. The apparatus of claim 19 , wherein the first decoding tool is skip mode and the second decoding tool is Combined Intra-Inter Prediction.
24. The apparatus of claim 19 , wherein the first decoding tool is multiple reference lines and the second decoding tool is intra sub-block partitioning.