Method for coding and decoding scalable video and apparatus using same
The present invention relates to a method and an apparatus for interlayer prediction, and the method for interlayer prediction, according to the present invention, comprises the steps of: deciding whether to apply an interlayer prediction to an enhancement layer; and performing a prediction on a current block of the enhancement layer based on reference information that is generalized and generated from a reference picture, which is decoded, of a reference layer, when the interlayer prediction is applied, wherein the reference layer information can be encoding information of a reference block, which corresponds to a current block of the enhancement layer, from the reference layer, and residual information.
1. A decoding method performed by a decoding apparatus comprising one or more processors and a memory, the method comprising:
determining whether to apply interlayer prediction to an enhancement layer;
constructing a reference picture list for a current block in the enhancement layer by including at least one of a reconstructed picture of the enhancement layer or a reconstructed picture of a reference layer or combination thereof, in response to a determination that the interlayer prediction is to be applied; and
performing prediction on the current block of the enhancement layer based on the reference picture list and motion information of the current block,
when the reconstructed picture of the reference layer is used for prediction of the current block, a generalized reference block is generated from the reconstructed picture of the reference layer and the generalized reference block is used for prediction of the current block,
wherein the generalized reference block is resampled using a filter determined in units of slices, and
wherein the generalized reference block is resampled based on a size of the reconstructed picture of the reference layer and a size of a current picture to which the current block of the enhancement layer belongs.
2. An encoding method performed by an encoding apparatus comprising one or more processors and a memory, the method comprising:
determining whether to apply interlayer prediction to an enhancement layer;
constructing a reference picture list for a current block in the enhancement layer by including at least one of a reconstructed picture of the enhancement layer or a reconstructed picture of a reference layer or combination thereof, in response to a determination that the interlayer prediction is to be applied; and
performing prediction on the current block of the enhancement layer based on the reference picture list and motion information of the current block,
when the reconstructed picture of the reference layer is used for prediction of the current block, a generalized reference block is generated from the reconstructed picture of the reference layer and the generalized reference block is used for prediction of the current block,
wherein the generalized reference block is resampled using a filter determined in units of slices, and
wherein the generalized reference block is resampled based on a size of the reconstructed picture of the reference layer and a size of a current picture to which the current block of the enhancement layer belongs.
3. A non-transitory computer-readable recording medium storing a bitstream that is generated by an encoding method, the method comprising:
determining whether to apply interlayer prediction to an enhancement layer;
constructing a reference picture list for a current block in the enhancement layer by including at least one of a reconstructed picture of the enhancement layer or a reconstructed picture of a reference layer or combination thereof, in response to a determination that the interlayer prediction is to be applied; and
performing prediction on the current block of the enhancement layer based on the reference picture list and motion information of the current block,
when the reconstructed picture of the reference layer is used for prediction of the current block, a generalized reference block is generated from the reconstructed picture of the reference layer and the generalized reference block is used for prediction of the current block,
wherein the generalized reference block is resampled using a filter determined in units of slices, and
wherein the generalized reference block is resampled based on a size of the reconstructed picture of the reference layer and a size of a current picture to which the current block of the enhancement layer belongs.