Motion compensation for video encoding and decoding

1. A method of encoding comprising:

obtaining local illumination compensation information associated with video information based on illumination changes in the video information and based on a plurality of motion vectors included in motion compensation information associated with the video information, the motion compensation information obtained based on an affine motion model; and

encoding the video information based on the local illumination compensation information and the motion compensation information;

wherein the video information comprises a first block including a first row of sub-blocks and a first column of sub-blocks, and the plurality of motion vectors comprises a group of motion vectors associated with a first subset of sub-blocks included in the first row of sub-blocks and a second subset of sub-blocks included in the first column of sub-blocks; and

wherein obtaining the local illumination compensation information is based on a set of reconstructed samples obtained based on the group of motion vectors; and

wherein the affine motion model comprises determining a local illumination compensation flag based on at least one affine control point associated with a second block neighboring the first block.

2. The method of claim 1 , wherein obtaining the local illumination compensation information comprises determining at least one model parameter of a linear model of illumination changes in the video information based on the group of motion vectors.

3. The method of claim 2 ,

wherein sub-blocks of the first block of video information are partitioned into a plurality of groups of sub-blocks;

wherein the at least one model parameter is determined for each of the plurality of groups of sub-blocks; and

wherein encoding or decoding based on the local illumination compensation information comprises processing video information associated with each group of sub-blocks using a respective at least one model parameter determined for each group of sub-blocks.

4. A method of decoding comprising:

obtaining local illumination compensation information associated with video information based on illumination changes in the video information and based on a plurality of motion vectors included in motion compensation information associated with the video information, the motion compensation information obtained based on an affine motion model; and

decoding the video information based on the local illumination compensation information and the motion compensation information;

wherein the video information comprises a first block including a first row of sub-blocks and a first column of sub-blocks, and the plurality of motion vectors comprises a group of motion vectors associated with a first subset of sub-blocks included in the first row of sub-blocks and a second subset of sub-blocks included in the first column of sub-blocks; and

wherein obtaining the local illumination compensation information is based on a set of reconstructed samples obtained based on the group of motion vectors; and

wherein the affine motion model comprises determining a local illumination compensation flag based on at least one affine control point associated with a second block neighboring the first block.

5. The method of claim 4 , wherein obtaining the local illumination compensation information comprises determining at least one model parameter of a linear model of illumination changes in the video information based on the group of motion vectors.

6. The method of claim 5 ,

wherein sub-blocks of the first block of video information are partitioned into a plurality of groups of sub-blocks;

wherein the at least one model parameter is determined for each of the plurality of groups of sub-blocks; and

wherein encoding or decoding based on the local illumination compensation information comprises processing video information associated with each group of sub-blocks using a respective at least one model parameter determined for each group of sub-blocks.

7. A non-transitory computer readable medium storing executable program instructions to cause a computer executing the program instructions to perform a method according to claim 4 .

8. An apparatus comprising:

one or more processors configured to:

obtain local illumination compensation information associated with video information based on illumination changes in the video information and based on a plurality of motion vectors included in motion compensation information associated with the video information, the motion compensation information obtained based on an affine motion model; and

encode the video information based on the local illumination compensation information and the motion compensation information;

wherein the video information comprises a first block including a first row of sub-blocks and a first column of sub-blocks, and the plurality of motion vectors comprises a group of motion vectors associated with a first subset of sub-blocks included in the first row of sub-blocks and a second subset of sub-blocks included in the first column of sub-blocks; and

wherein the local illumination compensation information is obtained based on a set of reconstructed samples obtained based on the group of motion vectors; and

wherein the affine motion model comprises a local illumination compensation flag determined based on at least one affine control point associated with a second block neighboring the first block.

9. The apparatus of claim 8 , wherein obtaining the local illumination compensation information comprises determining at least one model parameter of a linear model of illumination changes in the video information based on the group of motion vectors.

10. The apparatus of claim 9 ,

wherein sub-blocks of the first block of video information are partitioned into a plurality of groups of sub-blocks;

wherein the at least one model parameter is determined for each of the plurality of groups of sub-blocks; and

wherein encoding or decoding based on the local illumination compensation information comprises processing video information associated with each group of sub-blocks using a respective at least one model parameter determined for each group of sub-blocks.

11. A non-transitory computer readable medium storing executable program instructions to cause a computer executing the program instructions to perform a method according to claim 8 .

12. An apparatus comprising:

one or more processors configured to:

obtain local illumination compensation information associated with video information based on illumination changes in the video information and based on a plurality of motion vectors included in motion compensation information associated with the video information, the motion compensation information obtained based on an affine motion model; and

decode the video information based on the local illumination compensation information and the motion compensation information;

wherein the video information comprises a first block including a first row of sub-blocks and a first column of sub-blocks, and the plurality of motion vectors comprises a group of motion vectors associated with a first subset of sub-blocks included in the first row of sub-blocks and a second subset of sub-blocks included in the first column of sub-blocks; and

wherein the local illumination compensation information is obtained based on a set of reconstructed samples obtained based on the group of motion vectors; and

wherein the affine motion model comprises a local illumination compensation flag determined based on at least one affine control point associated with a second block neighboring the first block.

13. The apparatus of claim 12 , wherein obtaining the local illumination compensation information comprises determining at least one model parameter of a linear model of illumination changes in the video information based on the group of motion vectors.

14. The apparatus of claim 13 ,

wherein sub-blocks of the first block of video information are partitioned into a plurality of groups of sub-blocks;

wherein the at least one model parameter is determined for each of the plurality of groups of sub-blocks; and

wherein encoding or decoding based on the local illumination compensation information comprises processing video information associated with each group of sub-blocks using a respective at least one model parameter determined for each group of sub-blocks.

15. The apparatus of claim 12 , further comprising:

at least one of (i) an antenna configured to receive a signal, the signal including data representative of the video information, (ii) a band limiter configured to limit the signal to a band of frequencies that includes the data representative of the video information, or (iii) a display configured to display an image from the video information.

16. The apparatus of claim 12 , wherein the apparatus comprises one of a television, a television signal receiver, a set-top box, a gateway device, a mobile device, a cell phone, a tablet, a computer such as a laptop computer or a desktop computer, a server, or other electronic device.