Method and device for picture encoding and decoding
A decoding method is disclosed. It comprises: —decoding parameters for a current block; —disabling a first coding tool for said current block in the case where one or more of the following conditions is verified: a second coding tool is used for said current block and a given condition on the decoded parameters is verified; —enabling for said current block said first coding tool otherwise; and —decoding said current block using said first coding tool if said first coding tool is enabled.
1. A decoding method comprising:
decoding a first block level parameter for a current block;
disabling a Bi-directional Optical flow mode for the current block responsive to a first condition being verified, the Bi-directional Optical flow mode allowing refining a motion of samples of a block based on an optical flow, wherein the first condition is verified responsive to the decoded first block level parameter indicating a multi-hypothesis coding mode combining inter and intra prediction is used for the current block, the multi-hypothesis coding mode comprising obtaining a predictor for the current block, the predictor being a weighted average between an inter predictor of the current block and an intra predictor of the current block; and
decoding the current block.
2. The method of claim 1 , wherein the first condition is further verified responsive to a decoded second block level parameter indicating generalized bi-prediction weights are not equal to default weights.
3. The method of claim 1 , further comprising disabling a triangle mode for the current block responsive to the first condition being verified, the triangle mode comprising partitioning a predictor block in two partitions separated by a diagonal edge, each partition being associated to a different inter predictor block.
4. An encoding method comprising:
obtaining a first block level parameter for a current block;
disabling a Bi-directional Optical flow mode for the current block responsive to a first condition being verified, the Bi-directional Optical flow mode allowing refining a motion of samples of a block based on an optical flow, wherein the first condition is verified responsive to the obtained first block level parameter indicating a multi-hypothesis coding mode combining inter and intra prediction is used for the current block, the multi-hypothesis coding mode comprising obtaining a predictor for the current block, the predictor being a weighted average between an inter predictor of the current block and an intra predictor of the current block; and
encoding the current block.
5. The method of claim 4 , wherein the first condition is further verified responsive to an obtained second block level parameter indicating generalized bi-prediction weights are not equal to default weights.
6. A decoding apparatus comprising one or more processors configured to perform:
decoding a first block level parameter for a current block;
disabling a Bi-directional Optical flow mode for the current block responsive to a first condition being verified, the Bi-directional Optical flow mode allowing refining a motion of samples of a block based on an optical flow, wherein the first condition is verified responsive to the decoded first block level parameter indicating a multi-hypothesis coding mode combining inter and intra prediction is used for the current block, the multi-hypothesis coding mode comprising obtaining a predictor for the current block, the predictor being a weighted average between an inter predictor of the current block and an intra predictor of the current block; and
decoding the current block.
7. The decoding apparatus of claim 6 , wherein the first condition is further verified responsive to a decoded second block level parameter indicating generalized bi-prediction weights are not equal to default weights.
8. An encoding apparatus comprising one or more processors configured to perform:
obtaining a first block level parameter for a current block;
disabling a Bi-directional Optical flow mode for the current block responsive to a first condition being verified, the Bi-directional Optical flow mode allowing refining a motion of samples of a block based on an optical flow, wherein the first condition is verified responsive to the obtained first block level parameter indicating a multi-hypothesis coding mode combining inter and intra prediction is used for the current block, the multi-hypothesis coding mode comprising obtaining a predictor for the current block, the predictor being a weighted average between an inter predictor of the current block and an intra predictor of the current block; and
encoding the current block.
9. A non-transitory information storage medium storing program code instructions for implementing the method according to claim 1 .
10. A non-transitory information storage medium storing program code instructions for implementing the method according to claim 4 .
11. The method of claim 4 , further comprising disabling a triangle mode for the current block responsive to the first condition being verified, the triangle mode comprising partitioning a predictor block in two partitions separated by a diagonal edge, each partition being associated to a different inter predictor block.
12. The method of claim 4 , further comprising disabling generalized bi-prediction or setting generalized bi-prediction weights to default weights responsive to a second condition being verified, wherein the second condition is verified responsive to a size of the block is below a value.
13. The decoding apparatus of claim 6 , wherein the one or more processors are further configured to perform: disabling a triangle mode for the current block responsive to the first condition being verified, the triangle mode comprising partitioning a predictor block in two partitions separated by a diagonal edge, each partition being associated to a different inter predictor block.
14. The decoding apparatus of claim 6 , wherein the one or more processors are further configured to perform: disabling generalized bi-prediction or setting generalized bi-prediction weights to default weights responsive to a second condition being verified, wherein the second condition is verified responsive to a size of the block is below a value.
15. The encoding apparatus of claim 8 , wherein the first condition is further verified responsive to an obtained second block level parameter indicating generalized bi-prediction weights are not equal to default weights.
16. The encoding apparatus of claim 8 , wherein the one or more processors are further configured to perform: disabling a triangle mode for the current block responsive to the first condition being verified, the triangle mode comprising partitioning a predictor block in two partitions separated by a diagonal edge, each partition being associated to a different inter predictor block.
17. The encoding apparatus of claim 8 , wherein the one or more processors are further configured to perform: disabling generalized bi-prediction or setting generalized bi-prediction weights to default weights responsive to a second condition being verified, wherein the second condition is verified responsive to a size of the block is below a value.
18. The method of claim 1 , further comprising disabling generalized bi-prediction or setting generalized bi-prediction weights to default weights responsive to a second condition being verified, wherein the second condition is verified responsive to a size of the block is below a value.