Temporal motion vector predictor with displacement

1. A method for coding video data using temporal motion vector prediction (TMVP), the method being executed by one or more processors, the method comprising:

receiving video bitstream comprising one or more pictures;

determining that the one or more pictures are to be predicted in a regular merge mode or an adaptive motion vector prediction (AMVP) mode;

obtaining a displacement vector associated with a current block in a current picture, the displacement vector being signaled in the video bitstream to identify a reference block in the current picture;

determining motion information associated with the reference block based on the displacement vector, the motion information being used as a motion vector predictor (MVP) from a temporal motion vector predictor (TMVP) candidate;

generating a TMVP candidate list comprising the motion information;

deriving a motion vector for the current block using the TMVP candidate list; and

decoding the current block using the derived motion vector for prediction in the regular merge mode or the adaptive motion vector prediction (AMVP) mode.

2. The method of claim 1 , wherein the displacement vector indicates at least one respective position of the at least one motion vector predictor in the temporal motion vector predictor candidate list.

3. The method of claim 2 , wherein the temporal motion vector predictor candidate list is reordered based on a template matching cost.

4. The method of claim 2 , wherein the temporal motion vector predictor candidate list is generated using a pre-defined scan order, and wherein the pre-defined scan order is based on a magnitude of the displacement vector.

5. The method of claim 1 , wherein the displacement vector indicates at least one respective displacement vector among the plurality of displacement vectors associated with respective candidates in the temporal motion vector predictor candidate list.

6. The method of claim 1 , wherein obtaining the displacement vector is based on an index indicating motion vector difference with motion vector expression techniques.

7. The method of claim 1 , wherein obtaining the displacement vector based on an index indicating motion vector difference with adaptive motion vector resolution techniques.

8. The method of claim 7 , wherein the displacement vector has a displacement vector resolution in a specific number of samples.

9. The method of claim 8 , wherein the displacement vector resolution is signaled in a high level syntax.

10. An apparatus for coding video data using temporal motion vector prediction (TMVP), the apparatus 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:

receiving code configured to cause the at least one processor to receive video bitstream comprising one or more pictures;

determining code configured to cause the at least one processor to determine that the one or more pictures are to be predicted in a regular merge mode or an adaptive motion vector prediction (AMVP) mode;

obtaining code configured to cause the at least one processor to obtain obtaining a displacement vector associated with a current block in a current picture, the displacement vector being signaled in the video bitstream to identify a reference block in the current picture;

motion information code configured to cause the at least one processor to determine motion information associated with the reference block based on the displacement vector, the motion information being used as a motion vector predictor (MVP) from a temporal motion vector predictor (TMVP) candidate;

generating configured to cause the at least one processor to generate a TMVP candidate list comprising the motion information;

deriving configured to cause the at least one processor to derive a motion vector for the current block using the TMVP candidate list; and

decoding configured to cause the at least one processor to decode the current block using the derived motion vector for prediction in the regular merge mode or the adaptive motion vector prediction (AMVP) mode.

11. The apparatus of claim 10 , wherein the displacement vector indicates at least one respective position of the at least one motion vector predictor in the temporal motion vector predictor candidate list.

12. The apparatus of claim 11 , wherein the temporal motion vector predictor candidate list is reordered based on a template matching cost.

13. The apparatus of claim 11 , wherein the temporal motion vector predictor candidate list is generated using a pre-defined scan order, and wherein the pre-defined scan order is based on a magnitude of the displacement vector.

14. The apparatus of claim 10 , wherein the displacement vector indicates at least one respective displacement vector among the plurality of displacement vectors associated with respective candidates in the temporal motion vector predictor candidate list.

15. The apparatus of claim 10 , wherein obtaining the displacement vector is based on an index indicating motion vector difference with motion vector expression techniques.

16. The apparatus of claim 10 , wherein obtaining the displacement vector based on an index indicating motion vector difference with adaptive motion vector resolution techniques.

17. The apparatus of claim 16 , wherein the displacement vector has a displacement vector resolution in a specific number of samples.

18. 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 coding video data using temporal motion vector prediction (TMVP), cause the one or more processors to:

receive video bitstream comprising one or more pictures;

determine that the one or more pictures are to be predicted in a regular merge mode or an adaptive motion vector prediction (AMVP) mode;

obtain a displacement vector associated with a current block in a current picture, the displacement vector being signaled in the video bitstream to identify a reference block in the current picture;

determine motion information associated with the reference block based on the displacement vector, the motion information being used as a motion vector predictor (MVP) from a temporal motion vector predictor (TMVP) candidate;

generate a TMVP candidate list comprising the motion information;

derive a motion vector for the current block using the TMVP candidate list; and

decode the current block using the derived motion vector for prediction in the regular merge mode or the adaptive motion vector prediction (AMVP) mode.

19. The non-transitory computer-readable medium of claim 18 , wherein the displacement vector indicates at least one respective position of the at least one motion vector predictor in the temporal motion vector predictor candidate list.

20. The non-transitory computer-readable medium of claim 18 , wherein the displacement vector indicates at least one respective displacement vector among the plurality of displacement vectors associated with respective candidates in the temporal motion vector predictor candidate list.