Motion compensation using size of reference picture
A video coder is configured to determine a reference block of a reference picture for prediction of a current block of a current picture using motion information and to generate a set of reference samples for the current block of the current picture. To generate the set of reference samples, the video coder is configured to perform reference sample clipping on the reference block of the reference picture based on a size of the reference picture. The video coder is further configured to generate a prediction block for the current block of the current picture based on the set of reference samples.
1. A method of decoding video data, the method comprising: determining a reference block of a reference picture for prediction of a current block of a current picture using motion information; generating a set of reference samples for the current block of the current picture, wherein generating the set of reference samples comprises performing wraparound processing based on a size of the reference picture and performing reference sample clipping on the reference block of the reference picture based on the size of the reference picture; and generating a prediction block for the current block of the current picture based on the set of reference samples; and wherein performing the wraparound processing comprises generating a sample of the one or more set of reference samples based on the size of the reference picture and a wraparound offset.
2. The method of claim 1 , wherein the size of the reference picture comprises a width of the reference picture in samples.
3. The method of claim 1 , wherein the size of the reference picture comprises a height of the reference picture in samples.
4. The method of claim 1 , wherein performing reference sample clipping on the reference block comprises applying a clipping function that limits positions of the reference samples along a horizontal direction of the reference picture to a minimum of 0 and a maximum of a width of the reference picture in samples minus 1 and along a vertical direction of the reference picture to a minimum of 0 and a maximum of a height of the reference picture in samples minus 1.
5. The method of claim 1 , wherein generating the set of reference samples comprises performing wraparound processing based on the size of the reference picture.
6. The method of claim 5 , wherein performing the wraparound processing comprises generating a sample of the one or more set of reference samples based on the size of the reference picture and a wraparound offset.
7. The method of claim 1 , wherein the size of the reference picture is different than a size of the current picture.
8. The method of claim 1 , further comprising:
decoding a residual block for the current block of the current picture; and
decoding the current block of the current picture using the prediction block and the residual block.
9. The method of claim 1 , further comprising:
generating a residual block for the current block of the current picture using the current block of the current picture and the prediction block; and
encoding the residual block.
10. The method of claim 1 , wherein the size of the reference picture is the same as a size of the current picture.
11. A device configured to decode video data comprising: a memory configured to store video data; and one or more processors implemented in circuitry and configured to: determine a reference block of a reference picture for prediction of a current block of a current picture using motion information;
generate a set of reference samples for the current block of the current picture, wherein, to generate the set of reference samples, the one or more processors are configured to perform wraparound processing based on a size of the reference picture and perform reference sample clipping on the reference block of the reference picture based on the size of the reference picture; and generate a prediction block for the current block of the current picture based on the set of reference samples, and wherein, to perform the wraparound processing, the one or more processors are configured to generate a sample of the one or more set of reference samples based on the size of the reference picture and a wraparound offset.
12. The device of claim 11 , wherein the size of the reference picture comprises a width of the reference picture in samples.
13. The device of claim 11 , wherein the size of the reference picture comprises a height of the reference picture in samples.
14. The device of claim 11 , wherein, to perform reference sample clipping on the reference block, the one or more processors are configured to apply a clipping function that limits positions of the reference samples along a horizontal direction of the reference picture to a minimum of 0 and a maximum of a width of the reference picture in samples minus 1 and along a vertical direction of the reference picture to a minimum of 0 and a maximum of a height of the reference picture in samples minus 1.
15. The device of claim 11 , wherein, to generate the set of reference samples, the one or more processors are configured to perform wraparound processing based on the size of the reference picture.
16. The device of claim 15 , wherein, to perform the wraparound processing, the one or more processors are configured to generate a sample of the one or more set of reference samples based on the size of the reference picture and a wraparound offset.
17. The device of claim 11 , wherein the size of the reference picture is different than a size of the current picture.
18. The device of claim 11 , wherein the one or more processors are configured to:
decode a residual block for the current block of the current picture; and
decode the current block of the current picture using the prediction block and the residual block.
19. The device of claim 11 , wherein the one or more processors are configured to:
generate a residual block for the current block of the current picture using the current block of the current picture and the prediction block; and
encode the residual block.
20. The device of claim 11 , further comprising a display configured to display the video data.
21. The device of claim 11 , wherein the device comprises one or more of a camera, a computer, a mobile device, a broadcast receiver device, a set-top box, an integrated circuit, a microprocessor, or a wireless communication device.
22. The device of claim 11 , further comprising a camera configured to capture the video data.
23. The device of claim 11 , wherein the size of the reference picture is the same as a size of the current picture.
24. A non-transitory computer-readable storage medium having stored thereon instructions that, when executed, cause a processor to: determine a reference block of a reference picture for prediction of a current block of a current picture using motion information; generate a set of reference samples for the current block of the current picture, wherein, to generate the set of reference samples, the instructions cause the processor to perform wraparound processing based on a size of the reference picture and perform reference sample clipping on the reference block of the reference picture based on the size of the reference picture; and generate a prediction block for the current block of the current picture based on the set of reference samples, and wherein, to perform the wraparound processing, the instructions cause the processor to generate a sample of the one or more set of reference samples based on the size of the reference picture and wraparound offset.
25. The non-transitory computer-readable storage medium of claim 24 , wherein the size of the reference picture comprises a width of the reference picture in samples.
26. The non-transitory computer-readable storage medium of claim 24 , wherein the size of the reference picture comprises a height of the reference picture in samples.
27. The non-transitory computer-readable storage medium of claim 24 , wherein, to perform reference sample clipping on the reference block, the instructions cause the processor to apply a clipping function that limits positions of the reference samples along a horizontal direction of the reference picture to a minimum of 0 and a maximum of a width of the reference picture in samples minus 1 and along a vertical direction of the reference picture to a minimum of 0 and a maximum of a height of the reference picture in samples minus 1.
28. The non-transitory computer-readable storage medium of claim 24 , wherein, to generate the set of reference samples, the instructions cause the processor to perform wraparound processing based on the size of the reference picture.
29. The non-transitory computer-readable storage medium of claim 28 , wherein, to perform the wraparound processing, the instructions caused the processor to generate a sample of the one or more set of reference samples based on the size of the reference picture and a wraparound offset.
30. The non-transitory computer-readable storage medium of claim 24 , wherein the size of the reference picture is different than a size of the current picture.
31. The non-transitory computer-readable storage medium of claim 24 , wherein the instructions further cause the processor to:
decode a residual block for the current block of the current picture; and
decode the current block of the current picture using the prediction block and the residual block.
32. The non-transitory computer-readable storage medium of claim 24 , wherein the instructions further cause the processor to:
generate a residual block for the current block of the current picture using the current block of the current picture and the prediction block; and
encode the residual block.
33. The non-transitory computer-readable storage medium of claim 24 , wherein the size of the reference picture is the same as a size of the current picture.
34. A device configured to decode video data comprising: means for determining a reference block of a reference picture for prediction of a current block of a current picture using motion information; means for generating a set of reference samples for the current block of the current picture, wherein, the means for generating the set of reference samples comprises means for performing wraparound processing based on a size of the reference picture and means for performing reference sample clipping on the reference block of the reference picture based on the size of the reference picture; and means for generating a prediction block for the current block of the current picture based on the set of reference samples, wherein the means for performing the wraparound processing comprises means for generating a sample of the one or more set of reference samples based on the size of the reference picture and a wraparound offset.
35. The device of claim 34 , wherein the size of the reference picture comprises a width of the reference picture in samples.
36. The device of claim 34 , wherein the size of the reference picture comprises a height of the reference picture in samples.
37. The device of claim 34 , wherein the means for performing reference sample clipping on the reference block comprises means for applying a clipping function that limits positions of the reference samples along a horizontal direction of the reference picture to a minimum of 0 and a maximum of a width of the reference picture in samples minus 1 and along a vertical direction of the reference picture to a minimum of 0 and a maximum of a height of the reference picture in samples minus 1.
38. The device of claim 34 , wherein the means for generating the set of reference samples comprises means for performing wraparound processing based on the size of the reference picture.
39. The device of claim 38 , wherein the means for performing the wraparound processing comprises for generating a sample of the one or more set of reference samples based on the size of the reference picture and a wraparound offset.
40. The device of claim 34 , wherein the size of the reference picture is different than a size of the current picture.
41. The device of claim 34 , further comprising:
means for decoding a residual block for the current block of the current picture; and
means for decoding the current block of the current picture using the prediction block and the residual block.
42. The device of claim 34 , wherein further comprising:
means for generating a residual block for the current block of the current picture using the current block of the current picture and the prediction block; and
means for encoding the residual block.
43. The device of claim 34 , wherein the size of the reference picture is the same as a size of the current picture.