Image decoding method, image encoding method, image decoding device, image encoding device, and computer-readable recording medium

1. A method of decoding an image, the method comprising:

decoding information on a prediction method of a current block;

determining, based on the information on the prediction method, a prediction method of the current block; and

generating a prediction block of the current block by performing prediction for the current block based on the determined prediction method,

wherein the information on the prediction method includes at least one of information on subblock merge, information on MMVD, information on multi hypothesis prediction, or information on geometric partition prediction,

wherein the multi hypothesis prediction represents a prediction method generating a final prediction block by combining a prediction block generated by an inter prediction and a prediction block generated by an intra prediction,

wherein the information on the multi hypothesis prediction includes information indicating whether to perform the multi hypothesis prediction for the current block, and

wherein the information on the geometric partition prediction is signaled when it is determined that the multi hypothesis prediction is not performed on the current block.

2. An apparatus for decoding an image, the apparatus comprising:

at least one processor,

wherein the processor is configured to:

decode information on a prediction method of a current block,

determine, based on the information on the prediction method, a prediction method of the current block, and

generate a prediction block of the current block by performing prediction for the current block based on the determined prediction method,

wherein the information on the prediction method includes at least one of information on subblock merge, information on MMVD, information on multi hypothesis prediction, or information on geometric partition prediction,

wherein the multi hypothesis prediction represents a prediction method generating a final prediction block by combining a prediction block generated by an inter prediction and a prediction block generated by an intra prediction,

wherein the information on the multi hypothesis prediction includes information indicating whether to perform the multi hypothesis prediction for the current block, and

wherein the information on the geometric partition prediction is signaled when it is determined that the multi hypothesis prediction is not performed on the current block.

3. A method of encoding an image, the method comprising:

determining a prediction method of a current block;

generating a prediction block of the current block by performing prediction for the current block based on the determined prediction method; and

encoding information on the prediction method of the current block,

wherein the information on the prediction method includes at least one of information on subblock merge, information on MMVD, information on multi hypothesis prediction, or information on geometric partition prediction,

wherein the multi hypothesis prediction represents a prediction method generating a final prediction block by combining a prediction block generated by an inter prediction and a prediction block generated by an intra prediction,

wherein the information on the multi hypothesis prediction includes information indicating whether to perform the multi hypothesis prediction for the current block, and

wherein the information on the geometric partition prediction is encoded when it is determined that the multi hypothesis prediction is not performed on the current block.

4. An apparatus for encoding an image, the apparatus comprising:

at least one processor,

wherein the processor is configured to:

determine a prediction method of a current block,

generate a prediction block of the current block by performing prediction for the current block based on the determined prediction method, and

encode information on the prediction method of the current block,

wherein the information on the prediction method includes at least one of information on subblock merge, information on MMVD, information on multi hypothesis prediction, or information on geometric partition prediction,

wherein the multi hypothesis prediction represents a prediction method generating a final prediction block by combining a prediction block generated by an inter prediction and a prediction block generated by an intra prediction,

wherein the information on the multi hypothesis prediction includes information indicating whether to perform the multi hypothesis prediction for the current block, and

wherein the information on the geometric partition prediction is encoded when it is determined that the multi hypothesis prediction is not performed on the current block.

5. A non-transitory computer-readable medium for storing a bitstream generated by an image encoding method,

wherein the image encoding method comprises:

determining a prediction method of a current block;

generating a prediction block of the current block by performing prediction for the current block based on the determined prediction method; and

encoding information on the prediction method of the current block,

wherein the information on the prediction method includes at least one of information on subblock merge, information on MMVD, information on multi hypothesis prediction, or information on geometric partition predictions,

wherein the multi hypothesis prediction represents a prediction method generating a final prediction block by combining a prediction block generated by an inter prediction and a prediction block generated by an intra prediction,

wherein the information on the multi hypothesis prediction includes information indicating whether to perform the multi hypothesis prediction for the current block, and

wherein the information on the geometric partition prediction is encoded when it is determined that the multi hypothesis prediction is not performed on the current block.