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:
obtaining a residual block with respect to a current block from an input bitstream;
determining whether to apply interlayer prediction to an enhancement layer;
performing prediction on the current block of the enhancement layer based on a picture of a reference layer, in response to a determination that the interlayer prediction is to be applied; and
reconstructing the current block by adding the residual block to a prediction block obtained by performing the prediction on the current block,
wherein performing the prediction on the current block comprises:
reconstructing the picture of the reference layer by decoding the input bitstream including the reference layer;
constructing a reference picture list for the current picture based on the picture of the reference layer; and
performing the prediction on the current block of the enhancement layer based on the reference picture list and motion information of the current block.
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;
performing prediction on a current block of the enhancement layer based on a picture of a reference layer to generate a prediction block, in response to a determination that the interlayer prediction is to be applied;
obtaining a residual block with respect to the current block by subtracting the prediction block from the current block; and
encoding the residual block,
wherein performing the prediction on the current block comprises:
determining the picture of the reference layer;
constructing a reference picture list for the current picture based on the picture of the reference layer; and
performing the prediction on the current block of the enhancement layer based on the reference picture list and motion information of the current block.
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;
performing prediction on a current block of the enhancement layer based on a picture of a reference layer to generate a prediction block, in response to a determination that the interlayer prediction is to be applied;
obtaining a residual block with respect to the current block by subtracting the prediction block from the current block; and
encoding the residual block,
wherein performing the prediction on the current block comprises:
determining the picture of the reference layer;
constructing a reference picture list for the current picture based on the picture of the reference layer; and
performing the prediction on the current block of the enhancement layer based on the reference picture list and motion information of the current block.