Method for coding and decoding scalable video and apparatus using same

An interlayer prediction encoding method performed by an interlayer prediction 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 based on the current block and the prediction block;
• and
• encoding the residual block,
• wherein performing the prediction on the current block comprises:
• determining the picture of the reference layer;
• generating, from the determined picture of the reference layer, a generalized reference picture for interlayer prediction of a current picture of the enhancement layer;
• and
• performing the prediction on the current block of the enhancement layer based on the generalized reference picture to generate the prediction block,
• wherein the generalized reference picture is added to at least one reference picture belonging to a same enhancement layer as the current picture for constructing a reference picture list for the current picture, and
• wherein the encoding the residual block comprises:
• generating one or more quantized transform coefficients for the residual block by quantizing one or more transform coefficients for the residual block;
• and
• encoding the one or more quantized transform coefficients for the residual block to generate a bitstream.

A non-transitory computer-readable recording medium storing a bitstream that is generated by an interlayer prediction 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 based on the current block and the prediction block;
• and
• encoding the residual block,
• wherein performing the prediction on the current block comprises:
• determining the picture of the reference layer;
• generating, from the determined picture of the reference layer, a generalized reference picture for interlayer prediction of a current picture of the enhancement layer;
• and
• performing the prediction on the current block of the enhancement layer based on the generalized reference picture to generate the prediction block,
• wherein the generalized reference picture is added to at least one reference picture belonging to a same enhancement layer as the current picture for constructing a reference picture list for the current picture, and
• wherein the encoding the residual block comprises:
• generating one or more quantized transform coefficients for the residual block by quantizing one or more transform coefficients for the residual block;
• and
• encoding the one or more quantized transform coefficients for the residual block to generate a bitstream.